Updated on 2025/03/25

写真a

 
FUKAWA KAZUHIKO
 
Organization
School of Engineering Professor
Title
Professor
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News & Topics

Degree

  • Doctor of Engineering ( Tokyo Institute of Technology )

Research Interests

  • その他の通信応用

  • Radio communication systems and equipment

  • 無線通信方式・機器

  • 通信理論

  • Other applications of communication

  • Communication theory

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

Education

  • Tokyo Institute of Technology   Science of Engineering

    - 1987

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    Country： Japan

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  • Tokyo Institute of Technology   Graduate School, Division of Science and Engineering

    - 1987

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  • Tokyo Institute of Technology   School of Science

    - 1985

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    Country： Japan

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Research History

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Professional Memberships

  • 電子情報通信学会

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  • The Institute of Electrical and Electronics Engineers

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  • The Institute of Electrical and Electronics Engineers

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Committee Memberships

  • The Institute of Electrical and Electronics Engineers   IEEE Trans. VT 編集委員  

    2008   

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    Committee type：Academic society

    The Institute of Electrical and Electronics Engineers

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  • The Institute of Electrical and Electronics Engineers   Associate Editor, IEEE Transactions on Vehicular Technology  

    2008   

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    Committee type：Academic society

    The Institute of Electrical and Electronics Engineers

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  • 電子情報通信学会   研専運営会議・財務幹事、通信方式研究会・専門委員、無線通信システム研究会・副委員長、無線通信システム研究会・専門委員、英文論文誌B編集委員  

    2005 - 2007   

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    Committee type：Academic society

    電子情報通信学会

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Books

  • ディジタル信号処理

    培風館  2009  （ ISBN:9784563069971 ）

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MISC

  • Iterative Receiver Employing Phase Noise Compensation and Channel Estimation for Millimeter-Wave OFDM Systems

    Satoshi Suyama, Hiroshi Suzuki, Kazuhiko Fukawa, Jungo Izumi

    IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS   27 ( 8 )   1358 - 1366   2009.10

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    Language：English   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper proposes an iterative OFDM millimeter-wave receiver employing low-complexity decision-directed phase noise compensation (DD-PNC) to alleviate degradation due to the phase noise. High bit-rate OFDM transceivers based on the single-chip Si RF-CMOS IC technology in the 60-GHz millimeter-wave band have been extensively studied for wireless personal area network (WPAN) systems, and the relatively large phase noise in the phase locked loop (PLL) synthesizer severely degrades transmission performance. The proposed OFDM receiver iterates DD-PNC and decision-directed channel estimation (DDCE) by exploiting the output of the channel decoder. DD-PNC estimates the phase noise each sampling time by using the decoder output, and then it removes the estimate from a time-domain received signal. In addition, DDCE estimates a channel impulse response by using the compensated received signal. Computer simulations demonstrate that in the 64QAM modulation with the coding rate of 3/4, the proposed receiver with DD-PNC and DDCE can perfectly remove the phase noise of -85 dBc/Hz at 1 MHz offset, and that it can alleviate the degradation of the channel estimation due to the phase noise.

    DOI： 10.1109/JSAC.2009.091006

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  • Iterative Multiuser Detection with Soft Decision-Directed Channel Estimation for MC-IDMA and Performance Comparison with Chip-Interleaved MC-CDMA

    Satoshi Suyama, Hiroshi Suzuki, Kazuhiko Fukawa, Li Zhang

    IEICE TRANSACTIONS ON COMMUNICATIONS   E92B ( 5 )   1495 - 1503   2009.5

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper applies iterative multiuser detection employing a new channel estimation scheme to multicarrier interleave-division multiple access (MC-IDMA), called OFDM-IDMA, which is expected to offer improved spectral efficiency in mobile communications. The MC-IDMA transmitter uses both a low-rate channel code and an individual chip interleaver for each user. The MC-IDMA receiver. which this paper focuses upon, repeats the iterative multiuser detection and soft decision-directed channel estimation (SDCE) by exploiting log-likelihood ratios (LLRs) of the coded bits which the maximum a posteriori (MAP)-based channel decoders for all users provide. SDCE estimates channel impulse responses of all users by the least-mean-square (LMS) algorithm. which aims to minimize the mean squared error between the received signal and its replica. This paper investigates the performance of MC-IDMA employing SDCE and compares it with those of three MC-CDMA techniques. Computer simulations demonstrate that MC-IDMA employing SDCE outperforms time-spread MC-CDMA and frequency-spread MC-CDMA, and that it can achieve almost the same bit error rate performance as chip-interleaved MC-CDMA while requiring lower complexity.

    DOI： 10.1587/transcom.E92.B.1495

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  • MAP Receiver with Spatial Filters for Suppressing Cochannel Interference in MIMO-OFDM Mobile Communications

    Fan Lisheng, Kazuhiko Fukawa, Hiroshi Suzuki, Satoshi Suyama

    IEICE TRANSACTIONS ON COMMUNICATIONS   E92B ( 5 )   1841 - 1851   2009.5

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes joint maximum a posteriori (MAP) detection and spatial filtering for MIMO-OFDM mobile communications: it offers excellent receiver performance even over interference-limited channels. The proposed joint processor consists of a log likelihood generator and a MAP equalizer. The log likelihood generator suppresses cochannel interference by spatially filtering received signals and provides branch metrics of transmitted signal candidates. Using the branch metrics. the MAP equalizer generates log likelihood ratios of coded bits and performs channel decoding based on the MAP criterion. In the first stage, the log likelihood generator performs spatio-temporal filtering (STF) of the received signals prior to the fast Fourier transform (FFT) and is referred to as preFFT-type STE Estimation of parameters including tap coefficients of the spatio-temporal filters and equivalent channel impulse responses of desired signals is based on the eigenvalue decomposition of an autocorrelation matrix of both the received and transmitted signals. For further improvement, in the second stage, the generator performs spatial filtering (SF) of the FFT output and is referred to as postFFT-type SE Estimation of both tap coefficients of the spatial filters and channel impulse responses employs the recursive least squares (RLS) with smoothing. The reason for switching front preFFT-type STF into postFFT-type SF is that preFFT-type STF outperforms postFFT-type SF with a limited number of preamble symbols while postFFT-type SF outperforms preFFT-type STF when data symbols can be reliably detected and used for the parameter estimation. Note that there are two major differences between the proposed and conventional schemes: one is that the proposed scheme performs the two-stage processing of preFFT-type STF and postFFT-type SF, while the other is that the smoothing algorithm is applied to the parameter estimation of the proposed scheme. Computer simulations demonstrate that the proposed scheme can achieve excellent PER performance under interference-limited channel conditions and that it can outperform the conventional joint processing of preFFT-type STF and the MAP equalizer.

    DOI： 10.1587/transcom.E92.B.1841

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  • Precoding Technique for Minimizing BER of MIMO-OFDM System Employing MLD under Multicell Co-channel Interference

    Boonsarn Pitakdumrongkija, Kazuhiko Fukawa, Satoshi Suyama, Hiroshi Suzuki, Atsuo Umi

    IEICE TRANSACTIONS ON COMMUNICATIONS   E92B ( 5 )   1573 - 1581   2009.5

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    This paper proposes a MIMO-OFDM precoder that can minimize a BER upper bound of the maximum likelihood detector (MLD) under a non-cooperative downlink multicell co-channel interference (CCI) environment, Since there is no cooperation among base stations (BSs), it is assumed that information on the interference can be estimated at a mobile station (MS) and then fed back, to the desired BS for the precoder. The proposed scheme controls its precoding parameters under a transmit power constraint so as to minimize the BER upper bound, which is derived from the pairwise error probability (PEP) averaged with respect to CCI plus noise. Computer simulations demonstrate that the proposed precoder can effectively improve BER performance of cell edge users and is Superior in terms of BER to the eigenmode and the minimum mean squared error (MMSE) precoded transmissions which aim to maximize the channel capacity and to minimize MSE, respectively.

    DOI： 10.1587/transcom.E92.B.1573

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  • Adaptive MIMO-MLSE blind detection in heterogeneous stream transmission for mobile radio communications

    Issei Kanno, Hiroshi Suzuki, Kazuhiko Fuyawa

    IEICE TRANSACTIONS ON COMMUNICATIONS   E91B ( 7 )   2346 - 2356   2008.7

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    This paper proposes a novel MIMO system that introduces a heterogeneous stream (HTS) scheme and a blind signal detection method for mobile radio communications. The HTS scheme utilizes different modulation or coding methods for different MIMO streams, and the blind detection method requires no training sequences for signal separation, detection, and channel estimation. The HTS scheme can remove the ambiguity in identifying separated streams without unique words that are necessary in conventional MIMO blind detection. More specifically, two examples of HTS are considered: modulation type HTS (MHTS) and timing-offset type HTS (THTS). MHTS, which utilizes different modulation constellations with the same bandwidth for different streams, has been previously investigated. This paper proposes THTS which utilizes different transmission timing with the same modulation. THTS can make the blind detection more robust and effective with fractional sampling. The blind joint processing of detection and channel estimation performs adaptive blind MIMO-MLSE and is derived from an adaptive blind MLSE equalizer that employs the recursive channel estimation with the Moore-Penrose generalized inverse. Computer simulations show that the proposed system can achieve superior BER performance with E-b/N-0 degradation of I dB in THTS and 2.5 dB in MHTS compared with the ideal maximum likelihood detection.

    DOI： 10.1093/ietcom/e9l-b.7.2346

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  • MIMO-OFDM precoding technique for minimizing BER upper bound of MLD

    Boonsarn Pitakdumrongkija, Kazuhiko Fukawa, Hiroshi Suzuki, Takashi Hagiwara

    IEICE TRANSACTIONS ON COMMUNICATIONS   E91B ( 7 )   2287 - 2298   2008.7

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    This paper proposes a new MIMO-OFDM precoding technique that aims to minimize a bit error rate (BER) upper bound of the maximum likelihood detection (MLD) in mobile radio communications. Using a steepest descent algorithm, the proposed method estimates linear precoding matrices that can minimize the upper bound of BER under power constraints. Since the upper bound is derived from all the pairwise error probabilities, this method can effectively optimize overall Euclidean distances between signals received by multiple antennas and their replicas. Computer simulations evaluate the BER performance and channel capacity of the proposed scheme for 2 x 2 and 4 x 4 MIMO-OFDM systems with BPSK, QPSK, and 16QAM. It is demonstrated that the proposed precoding technique is superior in terms of average BER to conventional precoding methods including a precoder which maximizes only the minimum Euclidean distance as the worst case.

    DOI： 10.1093/ietcom/e9l-b.7.2287

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  • MIMO-OFDM precoding technique for minimizing BER upper bound of MLD under imperfect CSI

    Boonsarn Pitakdumrongkija, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E91B ( 5 )   1490 - 1501   2008.5

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    This paper proposes a new minimum BER (MBER) criterion precoding method that is robust to imperfect channel state information (CSI) for MIMO-OFDM mobile communications. The proposed MBER precoding aims to minimize BER of the maximum likelihood detection (MLD), on the condition that the transmitter can obtain only imperfect CSI owing to channel estimation and quantization errors of the feedback CSI. The proposed scheme controls its precoding parameters under a transmit power constraint by minimizing an upper bound of BER which is derived from the pairwise error probability and averaged with respect to the CSI error. In contrast with a conventional power allocation MBER precoding method that is also robust to the CSI error, the proposed scheme does not make any assumption on the precoding parameters so as to reduce complexity. Thus, it is expected to outperform the conventional scheme at the cost of higher complexity. Computer simulations demonstrate that the proposed precoding method outperforms a conventional nonrobust MBER precoder and the conventional robust power allocation MBER precoding method when the amount of the CSI error is not considerable.

    DOI： 10.1093/ietcom/e91-b.5.1490

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  • MIMO-OFDM MAP receiver with spatial-temporal filters employing decision-directed recursive eigenvalue decomposition parameter estimation

    Fan Lisheng, Kazuhiko Fukawa, Hiroshi Suzuki, Satoshi Suyama

    IEICE TRANSACTIONS ON COMMUNICATIONS   E91B ( 4 )   1112 - 1121   2008.4

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    This paper proposes a new parameter estimation method for the MIMO-OFDM MAT receiver with spatial-temporal filters. The proposed method employs eigenvalue decomposition (EVD) so as to attain precise estimates especially under interference-limited conditions in MIMO-OFDM mobile communications. Recursive EVD is introduced to reduce the computational complexity compared to the nonrecursive EVD. The spatial-temporal prewhitening is placed prior to FIT because this arrangement is superior to that of conventional prewhitening posterior to FFT in accuracy of the parameter estimation. In order to improve tracking capability to fast fading, the proposed scheme applies a decision-directed algorithm to the parameter estimation by using log-likelihood ratios of coded bits. Computer simulations demonstrate that the proposed scheme can track fast fading and reduce the complexity to 18 percents of the conventional one, and that the spatial-temporal filtering prior to FFT outperforms the conventional one posterior to FFT.

    DOI： 10.1093/ietcom/e91-b.4.1112

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  • Coded single-sideband QPSK and its turbo detection for mobile communication systems

    Boonsarn Pitakdumrongkija, Hiroshi Suzuki, Satoshi Suyarna, Kazuhiko Fukawa

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   57 ( 1 )   311 - 323   2008.1

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    This paper proposes a novel single-sideband quadrature phase shift keying (SSB QPSK) modulation scheme that utilizes a single-reference carrier frequency and transforms both baseband I and Q components into the same radio frequency band, whose width is exactly half that of QPSK. The modulation method is first derived and followed by the analysis of the matched filter demodulation. The analysis shows that there are performance degradations due to intersymbol interference (ISI) in the received signal and correlation in the received noise. To suppress the degradations, this paper employs a turbo equalizer for demodulation, in which the effects of ISI and noise correlation can be suppressed by a soft canceler and a noise whitening filter in the minimum mean square error (MMSE) linear equalizer, respectively. The computer simulations are then used to verify the proposed modulation scheme. At the transmitter, the root-raised cosine rolloff filter is employed for pulse shaping and Hilbert-transformed pulse generation. The truncation of the signal pulse is performed by the window function. The results show that the proposed modulation scheme outperforms 16-quadratic-amplitude modulation (16-QAM) with the turbo code in the Rayleigh-fading environment.

    DOI： 10.1109/TVT.2007.901960

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  • Adaptive MIMO-MLSE blind detection in heterogeneous stream transmission for mobile radio communications

    Issei Kanno, Hiroshi Suzuki, Kazuhiko Fukawa

    IEICE Transactions on Communications   E91-B ( 7 )   2346 - 2356   2008

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    Language：English   Publisher：Institute of Electronics, Information and Communication, Engineers, IEICE  

    This paper proposes a novel MIMO system that introduces a heterogeneous stream (HTS) scheme and a blind signal detection method for mobile radio communications. The HTS scheme utilizes different modulation or coding methods for different MIMO streams, and the blind detection method requires no training sequences for signal separation, detection, and channel estimation. The HTS scheme can remove the ambiguity in identifying separated streams without unique words that are necessary in conventional MIMO blind detection. More specifically, two examples of HTS are considered: modulation type HTS (MHTS) and timing-offset type HTS (THTS). MHTS, which utilizes different modulation constellations with the same bandwidth for different streams, has been previously investigated. This paper proposes THTS which utilizes different transmission timing with the same modulation. THTS can make the blind detection more robust and effective with fractional sampling. The blind joint processing of detection and channel estimation performs adaptive blind MIMO-MLSE and is derived from an adaptive blind MLSE equalizer that employs the recursive channel estimation with the Moore-Penrose generalized inverse. Computer simulations show that the proposed system can achieve superior BER performance with E b/N0 degradation of 1 dB in THTS and 2.5 dB in MHTS compared with the ideal maximum likelihood detection. Copyright © 2008 The Institute of Electronics, Information and Communication Engineers.

    DOI： 10.1093/ietcom/e91-b.7.2346

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  • Efficient OFDM mobile radio packet system employing LLR combining multiuser detection for ARQ with adaptive modulation and coding scheme

    Riichiro Nagareda, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E90B ( 6 )   1444 - 1453   2007.6

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    This paper proposes an OFDM mobile radio packet system that employs a new protocol of automatic repeat request (ARQ) for nonlinear multiuser detection (MUD) with log likelihood ratio combining (LC) on the appropriate bits. The conventional metric combining (MC) MUD separates collided packets by using nonlinear MUD, accumulates the Euclidian distance metrics of the received subcarrier symbols in the packets, and then achieves throughput improvement. However, when MC-MUD detects a packet error, it makes user terminals retransmit the same packets so as to reproduce the collision of the same packets. The proposed LC-MUD scheme simplifies the ARQ protocol and requires no reproduction of the same packet collision. The computer simulations demonstrate the superior throughput of LC-MUD to that of MC-MUD,and further improvement due to adaptive modulation and coding (AMC) optimized for the nonlinear MUD in LC-MUD.

    DOI： 10.1093/ietcom/e90-b.6.1444

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  • Suboptimal algorithm of MLD using gradient signal search in direction of noise enhancement for MIMO channels

    Thet Htun Khine, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E90B ( 6 )   1424 - 1432   2007.6

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    This paper proposes a suboptimal algorithm for the maximum likelihood detection (MLD) in multiple-input multiple-output (MIMO) communications. The proposed algorithm regards transmitted signals as continuous variables in the same way as a common method for the discrete optimization problem, and then searches for candidates of the transmitted signals in the direction of a modified gradient vector of the metric. The vector is almost proportional to the direction of the noise enhancement, from which zero-forcing (ZF) or minimum mean square error (MMSE) algorithms suffer. This method sets the initial guess to the solution by ZF or MMSE algorithms, which can be recursively calculated. Also, the proposed algorithm has the same complexity order as that of conventional suboptimal algorithms. Computer Simulations demonstrate that it is much superior in BER performance to the conventional ones.

    DOI： 10.1093/ietcom/e90-b.6.1424

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  • MLSE detection with blind linear prediction for differential space-time block code systems

    Seree Wanichpakdeedecha, Kazuhiko Fukawa, Hiroshi Suzuki, Satoshi Suyama

    IEICE TRANSACTIONS ON COMMUNICATIONS   E90B ( 4 )   926 - 933   2007.4

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    This paper proposes a maximum likelihood sequence estimation (MLSE) for the differential space-time block code (DSTBC) in cooperation with blind linear prediction (BLP) of fast frequency-flat fading channels. This method that linearly predicts the fading complex envelope derives its linear prediction coefficients by the method of Lagrange multipliers, and does not require data of decision-feedback or information on the channel parameters such as the maximum Doppler frequency in contrast to conventional ones. Computer simulations under fast fading conditions demonstrate that the proposed method with an appropriate degree of polynomial approximation is superior in BER performance to the conventional method that estimates the coefficients by the RLS algorithm using a training sequence.

    DOI： 10.1093/ietcom/e90-b.4.926

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  • MLSE detection with blind linear prediction and subcarriers interpolation for DSTBC-OFDM systems

    Seree Wanichpakdeedecha, Kazuhiko Fukawa, Hiroshi Suzuki, Satoshi Suyama

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 3 )   562 - 570   2007.3

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes low-complexity blind detection for orthogonal frequency division multiplexing (OFDM) systems with the differential space-time block code (DSTBC) under time-varying frequencyselective Rayleigh fading. The detector employs the maximum likelihood sequence estimation (MLSE) in cooperation with the blind linear prediction (BLP), of which prediction coefficients are determined by the method of Lagrange multipliers. Interpolation of channel frequency responses is also applied to the detector in order to reduce the complexity. A complexity analysis and computer simulations demonstrate that the proposed detector can reduce the complexity to about a half, and that the complexity reduction causes only a loss of 1 dB in average E-b/N-0 at BER of 10(-3) when the prediction order and the degree of polynomial approximation are 2 and 1, respectively.

    DOI： 10.1093/ietfec/e90-a.3.562

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  • Blind equalization with generalized inverse channel estimation and fractional phase MLSE metrics for mobile communications

    Issei Kanno, Hiroshi Suzuki, Kazuhiko Fukawa

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 3 )   553 - 561   2007.3

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    This paper proposes a new blind adaptive MLSE equalizer for frequency selective mobile radio channels. The proposed equalizer performs channel estimation for each survivor path of the Viterbi algorithm (VA), and restricts the number of symbol candidates for the channel estimation in order to reduce prohibitive complexity. In such channel estimation, autocorrelation matrices of the symbol candidates are likely to become singular, which increases the estimation error. To cope with the singularity, the proposed equalizer employs a recursive channel estimation algorithm using the Moore-Penrose generalized inverse of the autocorrelation matrix. As another problem, the blind channel estimation can yield plural optimal estimates of a channel impulse response, and the ambiguity of the estimates degrades the BER performance. To avoid this ambiguity, the proposed equalizer is enhanced so that it can take advantage of the fractional sampling. The enhanced equalizer performs symbol-spaced channel estimation for each fractional sampling phase. This equalizer combines separate channel estimation errors, and provides the sum to the VA processor as the branch metric, which tremendously reduces the probability that a correct estimate turns into a false one. Computer simulation demonstrates the effectiveness of the proposed equalizers in the frequency selective fading channels.

    DOI： 10.1093/ietfec/e90-a.3.553

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  • Adaptive MAP detection via the EM algorithm for LDPC-coded MIMO-OFDM mobile communications

    Tsuyoshi Kashima, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E90B ( 2 )   312 - 322   2007.2

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    This paper proposes an iterative maximum a posteriori probability (MAP) receiver for multiple-input-multiple-output (MIMO) and orthogonal frequency-division multiplexing (OFDM) mobile communications. For exploiting the space, time, and frequency diversity, the low-density parity-check code (LDPC) is used as a channel coding with a built-in interleaver. The receiver employs the expectation maximization (EM) algorithm so as to perform the MAP symbol detection with reasonable computational complexity. The minimum mean square error (MMSE), recursive least squares (RLS), and least mean square (LMS) algorithms are theoretically derived for the channel estimation within this framework. Furthermore, the proposed receiver performs a new scheme called backward symbol detection (BSD), in which the signal detection uses the channel impulse response that is estimated one OFDM symbol later. The advantage of BSD, which is explained from the viewpoint of the message passing algorithm, is that BSD can exploit information on the both precedent and subsequent OFDM symbols, similarly to RLS with smoothing and removing (SR-RLS) [25]. In comparison with SR-RLS, BSD reduces the complexity at the cost of packet error rate (PER) performance. Computer simulations show that the receiver employing RLS for the channel estimation outperforms the ones employing MMSE or LMS, and that BSD can improve the PER performance of the ones employing RLS or LMS.

    DOI： 10.1093/ietcom/e90-b.2.312

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  • Adaptive MAP detection via the EM algorithm for LDPC-coded MIMO-OFDM mobile communications

    Tsuyoshi Kashima, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE Transactions on Communications   E90-B ( 2 )   312 - 322   2007

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    Language：English   Publisher：Institute of Electronics, Information and Communication, Engineers, IEICE  

    This paper proposes an iterative maximum a posteriori probability (MAP) receiver for multiple-input-multiple-output (MIMO) and orthogonal frequency-division multiplexing (OFDM) mobile communications. For exploiting the space, time, and frequency diversity, the low-density parity-check code (LDPC) is used as a channel coding with a built-in interleaver. The receiver employs the expectation maximization (EM) algorithm so as to perform the MAP symbol detection with reasonable computational complexity. The minimum mean square error (MMSE), recursive least squares (RLS), and least mean square (LMS) algorithms are theoretically derived for the channel estimation within this framework. Furthermore, the proposed receiver performs a new scheme called backward symbol detection (BSD), in which the signal detection uses the channel impulse response that is estimated one OFDM symbol later. The advantage of BSD, which is explained from the viewpoint of the message passing algorithm, is that BSD can exploit information on the both precedent and subsequent OFDM symbols, similarly to RLS with smoothing and removing (SR-RLS) [25]. In comparison with SR-RLS, BSD reduces the complexity at the cost of packet error rate (PER) performance. Computer simulations show that the receiver employing RLS for the channel estimation outperforms the ones employing MMSE or LMS, and that BSD can improve the PER performance of the ones employing RLS or LMS. Copyright © 2007 The Institute of Electronics, Information and Communication Engineers.

    DOI： 10.1093/ietcom/e90-b.2.312

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  • Suboptimal algorithm of MLD using gradient signal search in direction of noise enhancement for MIMO channels

    Thet Htun Khine, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE Transactions on Communications   E90-B ( 6 )   1424 - 1432   2007

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    Language：English   Publisher：Institute of Electronics, Information and Communication, Engineers, IEICE  

    This paper proposes a suboptimal algorithm for the maximum likelihood detection (MLD) in multiple-input multiple-output (MIMO) communications. The proposed algorithm regards transmitted signals as continuous variables in the same way as a common method for the discrete optimization problem, and then searches for candidates of the transmitted signals in the direction of a modified gradient vector of the metric. The vector is almost proportional to the direction of the noise enhancement, from which zero-forcing (ZF) or minimum mean square error (MMSE) algorithms suffer. This method sets the initial guess to the solution by ZF or MMSE algorithms, which can be recursively calculated. Also, the proposed algorithm has the same complexity order as that of conventional suboptimal algorithms. Computer simulations demonstrate that it is much superior in BER performance to the conventional ones. Copyright © 2007 The Institute of Electronics, Information and Communication Engineers.

    DOI： 10.1093/ietcom/e90-b.6.1424

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  • Adaptive MAP receiver via the EM algorithm and message passings for MIMO-OFDM mobile communications

    T Kashima, K Fukawa, H Suzuki

    IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS   24 ( 3 )   437 - 447   2006.3

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    Language：English   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper proposes two new types of maximum a posteriori probability (MAP) receivers for multiple-input-multiple-output and orthogonal frequency-division multiplexing mobile communications with a channel coding such as the low-density parity-check code. One proposed receiver employs the expectation-maximization algorithm so as to improve performance of approximated MAP detection. Differently from a conventional receiver employing the minimum mean-square estimation (MMSE) algorithm, it applies the recursive least squares (RLS) algorithm to the channel estimation in order to track a fast fading channel. For the purpose of further improvement, the other proposed receiver applies a new adaptive algorithm that can be derived from the message passing on factor graphs. The algorithm exploits all detected signals but one of targeted time, and can gain a considerable advantage over the MMSE and RLS. Computer simulations show that the first proposed receiver is superior in channel-tracking ability to the conventional receiver employing the MMSE. Furthermore, it is demonstrated that the second proposed receiver remarkably outperforms both the conventional and the first proposed ones.

    DOI： 10.1109/JSAC.2005.862396

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  • Adaptive MAP receiver via the EM algorithm and message passings for MIMO-OFDM mobile communications

    T. Kashima, K. Fukawa, H. Suzuki

    IEEE Jour. on Select. Area in Communi.   24 ( 3 )   437 - 447   2006

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  • Adaptive MAP receiver via the EM algorithm and message passings for MIMO-OFDM mobile communications

    T. Kashima, K. Fukawa, H. Suzuki

    IEEE Jour. on Select. Area in Communi.   24 ( 3 )   437 - 447   2006

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  • A frame synchronization method for adaptive array antennas in digital mobile communications

    K Fukawa, H Suzuki

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   54 ( 6 )   1992 - 2002   2005.11

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    Language：English   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper proposes a frame synchronization method for an adaptive array antenna (AAA) used in digital mobile communications. The proposed scheme, which is based on the maximum likelihood estimation (MLE), calculates error signals by subtracting a training sequence convolved with an estimated channel impulse response from the AAA outputs and searches for the timing that minimizes the mean squared errors. Because the proposed scheme can effectively exploit delayed paths of the desired signal, it can improve the synchronization performance on frequency-selective fading channels. Computer simulations show that the proposed scheme can operate properly even in interference-rich fading environments and that it can significantly improve the synchronization performance.

    DOI： 10.1109/TVT.2005.858195

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  • Systolic OMF-RAKE: Linear interference canceller utilizing systolic array for mobile communications

    TH Khine, K Fukawa, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 5 )   2128 - 2135   2005.5

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    As a blind linear-interference-canceller for DS-CDMA mobile communications, the orthogonal matched filter (OMF) minimizes the power of the output while maintaining constant power of the desired signal in the output. This paper studies the extension of OMF to an RAKE receiver (OMF-RAKE), which adaptively controls the steering vectors that determine the constraint. It also applies the QR-RLS algorithm to estimate the OMF-RAKE parameters and investigates a hardware implementation that employs a systolic array. Computer simulations show that OMF-RAKE with the QR-RLS algorithm and the systolic array structure can reduce the computational complexity to about a half that of the conventional RLS-type algorithm without degrading the BER.

    DOI： 10.1093/ietcom/e88-b.5.2128

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  • A scattered pilot OFDM receiver employing turbo ICI cancellation in fast fading environments

    S Suyama, M Ito, K Fukawa, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 1 )   115 - 121   2005.1

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    This paper proposes a scattered-pilot-OFDM reception scheme employing turbo inter-carrier interference (ICI) cancellation in the fast varying fading environments of mobile communications. In the OFDM transmission, the orthogonality among the subcarriers cannot hold due to large Doppler shift, and the OFDM signal suffers from severe degradation due to ICI. The proposed receiver carries out two modes: (i) a coherent detection (CD) mode. and (it) a turbo ICI cancellation (TC) mode. Initially, the receiver performs the CD mode. When any decision errors are detected, it shifts from the CD mode to the TC one that carries out both the ICI cancellation and the channel estimation by using the decoder output (the log likelihood ratio). In addition, the iteration of the TC mode can improve the accuracy of the channel estimation and ICI cancellation ability. Computer simulations following specifications for the mobile reception mode in the digital terrestrial television broadcasting demonstrate that the receiver can effectively cancel ICI due to the fast varying fading, and that its average BER performance is much better than that of CD.

    DOI： 10.1093/ietcom/E88-B.1.115

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  • Blocking probability calculation using traffic equivalent distributions in SIR-based power controlled W-CDMA cellular systems

    Y Ishikawa, S Onoe, K Fukawa, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 1 )   312 - 324   2005.1

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In W-CDMA systems, distributions of the interference power and the total transmit power both measured at base stations are respectively used for capacity analysis in the uplink and downlink. For accurate capacity analysis, these quantities must be in proportion to the traffic amount. However, these quantities are no longer in proportion to the traffic amount since the transmit power control maintains the signal to interference power ratio at a constant level. Although the relationship between these measurements and the traffic amount has been investigated, there are still challenges to calculate the statistics such as the blocking probability or the outage probability accurately. This paper proposes a method to calculate the blocking probability by transforming the distributions of these measurements into distributions that are referred to as "traffic equivalent distributions," where the distributions are automatically adjusted according to the traffic amount. The calculated results show good agreement with the results obtained by dynamic computer simulations in the uplink, and show good agreement in the downlink as well when the traffic load is light. Accurate calculation of the blocking probability using a feedback loop and the observation of the traffic equivalents is also reported.

    DOI： 10.1093/ietcom/E88-B.1.312

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  • OFDM mobile packet transmission system with multiuser detection and metric combining ARQ

    R Nagaredat, K Fukawa, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 1 )   106 - 114   2005.1

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes an OFDM mobile packet transmission scheme that increases throughput by using nonlinear multiuser detection (MUD) and automatic repeat request (ARQ) with metric-combining. The scheme identifies users by detecting user identification (ID) symbols located at the head of a packet, and can separate packets that have collided by using MUD. It also forces the respective transmitters to retransmit the same packets so as to reproduce the collision if the cyclic redundancy check (CRC) detects some errors, and it uses metric-combining to decrease the number of retransmissions. The results of computer simulations show that the proposed scheme can provide twice the throughput of the conventional schemes.

    DOI： 10.1093/ietcom/E88-B.1.106

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  • A MIMO-OFDM receiver employing the low-complexity turbo equalization in multipath environments with delay difference greater than the guard interval

    S Suyama, H Suzuki, K Fukawa

    IEICE TRANSACTIONS ON COMMUNICATIONS   E88B ( 1 )   39 - 46   2005.1

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    When the multipath delay difference exceeds the guard interval (GI), the performance of MIMO-OFDM transmission suffers severely from both the inter-symbol interference (ISI) from the adjacent OFDM symbols and the inter-carrier interference (ICI) within the same symbol. This paper therefore proposes a MIMO-OFDM receiver employing the low-complexity turbo equalization. The proposed receiver initially separates the data streams and suppresses ICI by linear processing. In the iterative processing, it cancels the other data streams as well as ISI and ICL The MIMO-OFDM turbo equalizer consists of an ISI canceller, an ICI canceller, an optimal detection filter, and a MAP detector. The proposed receiver can improve the transmission performance by exploiting the log-likelihood ratio that the decoding process produces for canceling both ISI and ICI and separating of the spatially multiplexed streams. Computer simulations. which apply the wireless LAN to MIMO, demonstrate that the proposed receiver can provide excellent performance in the severe multipath channels where the delay difference is greater than GI.

    DOI： 10.1093/ietcom/E88-B.1.39

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  • A MIMO-OFDM receiver employing the low-complexity turbo equalization in multipath environments with delay difference greater than the guard interval

    Satoshi Suyama, Hiroshi Suzuki, Kazuhiko Fukawa

    IEICE Transactions on Communications   E88-B ( 1 )   39 - 46   2005

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    Language：English   Publisher：Institute of Electronics, Information and Communication, Engineers, IEICE  

    When the multipath delay difference exceeds the guard interval (GI), the performance of MIMO-OFDM transmission suffers severely from both the inter-symbol interference (IST) from the adjacent OFDM symbols and the inter-carrier interference (ICI) within the same symbol. This paper therefore proposes a MIMO-OFDM receiver employing the low-complexity turbo equalization. The proposed receiver initially separates the data streams and suppresses ICI by linear processing. In the iterative processing, it cancels the other data streams as well as ISI and ICI. The MIMO-OFDM turbo equalizer consists of an ISI canceller, an ICI canceller, an optimal detection filter, and a MAP detector. The proposed receiver can improve the transmission performance by exploiting the log-likelihood ratio that the decoding process produces for canceling both ISI and ICI and separating of the spatially multiplexed streams. Computer simulations, which apply the wireless LAN to MIMO, demonstrate that the proposed receiver can provide excellent performance in the severe multipath channels where the delay difference is greater than GI. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.

    DOI： 10.1093/ietcom/E88-B.1.39

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  • Systolic OMF-RAKE: Linear interference canceller utilizing systolic array for mobile communications

    Thet Htun Khine, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE Transactions on Communications   E88-B ( 5 )   2128 - 2135   2005

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    Language：English   Publisher：Institute of Electronics, Information and Communication, Engineers, IEICE  

    As a blind linear-interference-canceller for DS-CDMA mobile communications, the orthogonal matched filter (OMF) minimizes the power of the output while maintaining constant power of the desired signal in the output. This paper studies the extension of OMF to an RAKE receiver (OMF-RAKE), which adaptively controls the steering vectors that determine the constraint. It also applies the QR-RLS algorithm to estimate the OMF-RAKE parameters and investigates a hardware implementation that employs a systolic array. Computer simulations show that OMF-RAKE with the QR-RLS algorithm and the systolic array structure can reduce the computational complexity to about a half that of the conventional RLS-type algorithm without degrading the BER. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.

    DOI： 10.1093/ietcom/e88-b.5.2128

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  • OFDM mobile packet transmission system with multiuser detection and metric combining ARQ

    Riichiro Nagareda, Kazuhiko Fukawa, Hiroshi Suzuki

    IEICE Transactions on Communications   E88-B ( 1 )   106 - 114   2005

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    Language：English   Publisher：Institute of Electronics, Information and Communication, Engineers, IEICE  

    This paper proposes an OFDM mobile packet transmission scheme that increases throughput by using nonlinear multiuser detection (MUD) and automatic repeat request (ARQ) with metric-combining. The scheme identifies users by detecting user identification (ID) symbols located at the head of a packet, and can separate packets that have collided by using MUD. It also forces the respective transmitters to retransmit the same packets so as to reproduce the collision if the cyclic redundancy check (CRC) detects some errors, and it uses metric-combining to decrease the number of retransmissions. The results of computer simulations show that the proposed scheme can provide twice the throughput of the conventional schemes. © 2005 The Institute of Electronics, Information and Communication Engineers.

    DOI： 10.1093/ietcom/E88-B.1.106

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  • Performance analysis on data transmission control in a voice/data integrated wireless communication system

    Y Ishikawa, K Fukawa, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E87B ( 5 )   1131 - 1140   2004.5

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    In communication systems such as mobile telecommunication systems and the Inter-net, resource sharing among coexisting realtime and non-real-time services is extremely important to provide multimedia services. This paper analytically investigates the performance of the packet data control algorithm proposed in [9]. This algorithm efficiently uses radio resources by utilizing the remaining capacity that is not used by real-time services. The state probability vectors and transition probability matrices of both the real-time and non-real-time services are first derived and then the delay characteristics, the outage probability of voice users, and the outage probability of data user, are evaluated. A performance analysis with high bit-rate non-real-time services is also presented.

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  • A power amplifier model considering drain current dependence upon input power for high efficiency transmitter power amplifiers in mobile communications

    F Iizuka, H Suzuki, K Fukawa

    IEICE TRANSACTIONS ON ELECTRONICS   E87C ( 5 )   762 - 771   2004.5

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    In this paper, we propose a simple and accurate transfer function model of the power amplifiers for mobile communications. Detail analysis yields a generalized model for AM/AM characteristics in classes AB, B, and C. The analysis includes the effect of drain current variation with input level variation. This model introduces a loadline variation ratio to indicate the change of drain current and to represent the operation classes in a small signal region. Further discussion leads to simplified approximate equations for the AM/AM characteristics, and the estimation procedures for the simplified model parameters. Using the derived procedures, an efficient power amplifier employing pseudomorphic high electron mobility transistor (PHEMT) is fabricated for the 2 GHz band. Finally. the various characteristics given by the model, simulator and measurements are compared and found to agree well in the range of 20 dB below the saturated output level. The model is very effective for characterizing the power amplifiers that are used in linear compensation techniques such as predistortion methods, due to its severe nonlinearity of AM/AM and AM/PM characteristics.

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  • An MMSE based calibration of a LINC mansmitter

    R Nagareda, K Fukawa, H Suzuki

    IEICE TRANSACTIONS ON COMMUNICATIONS   E87B ( 3 )   689 - 694   2004.3

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    This paper proposes a new correction technique for a linear amplification with nonlinear components (LINC) transmitter. The technique, which is based on the minimum mean squared error (MMSE) criterion, estimates the gain and phase imbalance between the two amplifier branches. With information on the estimation, the imbalance is offset by controlling the amplitude and phase of the input signal that is fed into one of the two amplifiers. Computer simulations with a DS-CDMA system demonstrate that this method can compensate for the imbalance and sufficiently suppress the out-of-band distortion spectrum.

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  • Multiple finger expansion for blind interference canceller in the presence of subchip-spaced multipath components

    TQS Quek, H Suzuki, K Fukawa

    JOURNAL OF COMMUNICATIONS AND NETWORKS   6 ( 1 )   26 - 34   2004.3

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    Language：English   Publisher：KOREAN INST COMMUNICATIONS SCIENCES (K I C S)  

    A blind interference canceller in the presence of subchip-spaced multipath channels for direct-sequence code division multiple access (DS-CDMA) down-link system is considered. This technique is based on combining the existing blind interference canceller with a technique that involves assigning subchip-tap spacing to the Rake receiver. The proposed receiver minimizes the receiver's output energy subject to a constraint in order to mitigate the multiple access interference (MAI) along each multipath component, and then suboptimally combining all the multipath components. Moreover, it is able to mitigate the mismatch problem when subchip-spaced multipath components arrive at the blind interference canceller. It is known that optimal combining techniques perform a decorrelation operation before combining, which requires both knowledge and computational complexity. In the following, we have adopted a simpler but suboptimum approach in the combining of the suppressed signals at the output of our proposed receiver. Computer simulation results verify the effectiveness of the proposed receiver to handle subchip-spaced multipath components and still suppresses MAI significantly.

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  • Highly efficient Doherty linear amplifier with input power allocation control for portable radio

    F. Iizuka, T. Ogino, H. Suzuki, K. Fukawa

    IEICE Trans. Electronics   E87-C ( 5 )   915 - 923   2004

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  • A power amplifier model considering drain current dependence upon input power for high efficiency transmitter power amplifiers in mobile communications

    F. Iizuka, T. Ogino, H. Suzuki, K. Fukawa

    IEICE Trans. Electronics   E87-C ( 5 )   762 - 771   2004

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  • Multiple finger expansion for blind interference canceller in the presence of subchip-spaced multipath components

    Tony Q, S. Quek, H. Suzuki, K. Fukawa

    Jour. of Communi.s and Networks   6 ( 1 )   26 - 34   2004

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  • Highly efficient Doherty linear amplifier with input power allocation control for portable radio

    F. Iizuka, T. Ogino, H. Suzuki, K. Fukawa

    IEICE Trans. Electronics   E87-C ( 5 )   915 - 923   2004

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  • Complex form bandpass sampling with offset frequency sampling and quadrature component interpolation for modulated signals

    N Sato, H Suzuki, S Suyama, K Fukawa

    IEICE TRANSACTIONS ON COMMUNICATIONS   E86B ( 12 )   3513 - 3520   2003.12

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes complex form BandPass Sampling (BPS) that is suitable for the software radio. This BPS utilizes offset frequency sampling and quadrature component interpolation. Three types of BPS techniques are first reviewed, which shows effectiveness of the proposed BPS technique. The major advantages over the conventional BPS techniques are: i) free from the DC offset that is caused by the leak of the sampling clock harmonics into the received signal, and ii) reduction of alias by the complex number processing in the signal detection. Next, detailed description of the BPS operation shows that it requires real-time interpolation for the time alignment of the sampled quadrature component. Finally, computer simulation shows that the misalignment generates distortion, and that effective interpolation techniques can reduce the distortion level less than -60dB even for wideband signals.

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  • Constant modulus algorithm with orthogonal projection for adaptive array antenna multiuser detection

    K Fukawa, H Suzuki, WK Shao

    IEICE TRANSACTIONS ON COMMUNICATIONS   E86B ( 1 )   206 - 212   2003.1

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes a new blind algorithm effective for multiuser detection with an adaptive array antenna. The conventional blind algorithm, known as the Constant Modulus Algorithm (CMA), has two major drawbacks: (i) the convergence speed is not sufficiently fast for usual applications in mobile communications, and (ii) the algorithm is very likely to lock on the path with the largest received power, which means the signal with the second largest power can hardly be extracted. This paper introduces the Recursive Least Squares algorithm for CMA (RLS-CMA) in order to speed the convergence up, and additionally introduces the concept of the orthogonal projection into CMA so as to extract signals with weak power. The proposed CMA with Orthogonal Projection (CMA-OP) sequentially calculates the weight vector of each user under a constraint that the weight vector should be orthogonal to the estimated array response vectors of previously extracted users. Computer simulations demonstrate that the proposed scheme can operate properly in the Rayleigh fading channels under the two-user condition.

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  • OFDM channel estimation with RLS algorithm for different pilot schemes in mobile radio transmission

    K Fukawa, H Suzuki, T Usami

    IEICE TRANSACTIONS ON COMMUNICATIONS   E86B ( 1 )   266 - 274   2003.1

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    This paper proposes a new method to estimate the channel impulse response for Orthogonal Frequency Division Multiplexing (OFDM) mobile radio transmission. The method employs the Recursive Least Squares (RLS) algorithm so as to exploit the correlations in frequency and time domains, and can improve the estimation accuracy. It is also applicable to both the regular and scattered pilot schemes. Computer simulations demonstrate effectiveness of the method applied to the scattered pilot scheme.

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  • A scattered pilot OFDM receiver with equalization for multipath environments with delay difference greater than guard interval

    S. Suyama, M. Ito, H. Suzuki, K. Fukawa

    IEICE Trans. on Communi.   E86-B ( 1 )   275 - 281   2003

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  • Constant modulus algorithm with orthogonal projection for adaptive array antenna multiuser detection

    K. Fukawa, H, Suzuki W. Shao

    IEICE Trans. Communi.   E86-B ( 1 )   206 - 212   2003

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  • A scattered pilot OFDM receiver with equalization for multipath environments with delay difference greater than guard interval

    S. Suyama, M. Ito, H. Suzuki, K. Fukawa

    IEICE Trans. on Communi.   E86-B ( 1 )   275 - 281   2003

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  • 移動無線環境におけるスキャタードパイロットOFDM信号の遅延プロファイル推定と同期検波方式

    宇佐美俊明, 府川和彦, 鈴木博

    信学技報   RCS2000-179   2001

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  • A frame synchronization method for adaptive array antennas

    Kazuhiko Fukawa, Hiroshi Suzuki

    PIMRC 2001   80 - 84   2001

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  • A frame synchronization method for adaptive array antennas

    Kazuhiko Fukawa, Hiroshi Suzuki

    PIMRC 2001   80 - 84   2001

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  • A fast tracking coherent detection for mobile radio communications

    Kazuhiko Fukawa, Hiroshi Suzuki

    APCC 2001   E84-B ( 11 )   53 - 56   2001

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  • A fast tracking coherent detection for mobile radio communications

    Kazuhiko Fukawa, Hiroshi Suzuki

    APCC 2001   E84-B ( 11 )   53 - 56   2001

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  • ガウス形入射角分布環境におけるアダプティブアレーアンテナの理論解析

    加藤康充, 府川和彦, 須山聡 鈴木博

    電子情報通信学会ソサイエティ大会   B-5-74   2001

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  • 移動通信における高速追従同期検波の検討

    府川和彦, 鈴木

    電子情報通信学会ソサイエティ大会   B-5-161   2001

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  • 最小２乗法によるLINC用送信電力増幅器の振幅･位相バランス調整法

    流田理一郎, 府川和彦, 鈴木博

    信学技報   RCS2001-169   2001

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  • A suboptimal receiver for joint spatial-temporal filtering and multiuser detection in mobile radio communications

    K Fukawa

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   49 ( 4 )   1196 - 1206   2000.7

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    Language：English   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper proposes a suboptimal receiver for joint spatial-temporal filtering and multiuser detection in mobile radio communications using single carrier signaling. The proposed receiver is a reasonable approximation of the maximum likelihood (ML) based optimal receiver described herein. A cascaded connection of an adaptive array antenna and an hit multiuser sequence estimator is the basis of the proposed receiver. The major advantages of the proposed receiver over conventional adaptive array antennas are: ii delayed path components of desired signals can be effectively combined; 2) interference signals exceeding the degree of freedom; and 3) those having the same incident angle as that of desired path components can both be suppressed. The proposed receiver does not require prohibitively large computational complexity. Results of computer simulations presented in this paper show that the proposed receiver exhibits excellent performance even in severe multipath fading environments.

    DOI： 10.1109/25.875228

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  • Coherent frequency hopping multiple access (CFHMA) with multiuser detection for mobile communication systems

    Shigeru Tomisato, Kazuhiko Fukawa, Member Hiroshi Suzuki

    IEEE Transactions on Vehicular Technology   49 ( 2 )   531 - 539   2000.3

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    This paper proposes a new multiple-access (MA) scheme, coherent frequency hopping MA (CFHMA) with multiuser detection, which effectively obtains the diversity effect for realizing spectrally efficient mobile communications. CFHMA is fundamentally equivalent to a coherent fast frequency hopping frequency-division MA (FDMA) that incorporates low spreading factor direct-sequence (DS) code-division MA (CDMA). Multiple users occupy the same frequency band, and they are simultaneously detected by multiuser detection. There are several implementations of CFHMA. Two major techniques are introduced: coherent hybrid DS fast FH (FFH) (CHYB-DS-FFH) and interleaved FH (IFH). This paper focuses on IFH and discusses its principle of operation, transmission system configuration, and performance aspects. The results suggest the feasibility of a spectrally efficient mobile radio system.

    DOI： 10.1109/25.832984

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  • Coherent frequency hopping multiple access (CFHMA) with multiuser detection for mobile communication systems

    S Tomisato, K Fukawa, H Suzuki

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY   49 ( 2 )   531 - 539   2000.3

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    Language：English   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    This paper proposes a new multiple-access (MA) scheme, coherent frequency hopping MA (CFHMA) with multiuser detection, which effectively obtains the diversity effect for realizing spectrally efficient mobile communications. CFHMA is fundamentally equivalent to a coherent fast frequency hopping frequency-division MA (FDMA) that incorporates low spreading factor direct-sequence (DS) code-division IMA (CDMA). Multiple users occupy the same frequency band, and they are simultaneously detected by multiuser detection. There are several implementations of CFHMA. Two major techniques are introduced: coherent hybrid DS fast FH (FFH) (CHYB-DS-FFH) and interleaved FH (IFH), This paper focuses on IFH and discusses its principle of operation, transmission system configuration, and performance aspects. The results suggest the feasibility of a spectrally efficient mobile radio system.

    DOI： 10.1109/25.832984

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  • An orthogonal successive interference canceller for the downlink communications

    Kazuhiko Fukawa

    IEEE Globecom 2000   847 - 851   2000

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  • A suboptimal receiver for joint spatial-temporal filtering and multiuser detection in mobile radio communications

    Kazuhiko Fukawa

    IEEE Transactions on Vehicular Technology   49 ( 4 )   1196 - 1206   2000

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    Language：English  

    This paper proposes a suboptimal receiver for joint spatial-temporal filtering and multiuser detection in mobile radio communications using single carrier signaling. The proposed receiver is a reasonable approximation of the maximum likelihood (ML) based optimal receiver described herein. A cascaded connection of an adaptive array antenna and an ML multiuser sequence estimator is the basis of the proposed receiver. The major advantages of the proposed receiver over conventional adaptive array antennas are: 1) delayed path components of desired signals can be effectively combined
    2) interference signals exceeding the degree of freedom
    and 3) those having the same incident angle as that of desired path components can both be suppressed. The proposed receiver does not require prohibitively large computational complexity. Results of computer simulations presented in this paper show that the proposed receiver exhibits excellent performance even in severe multipath fading environments. © 2000 IEEE.

    DOI： 10.1109/25.875228

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  • Fast Convergence Signaling for Adaptive Linear Interference Canceller for CDMA Mobile Communications

    Kazuhiko Fukawa

    IEEE Vehicular Tech. Conf. Spring   3.04   2000

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  • Fast Convergence Signaling for Adaptive Linear Interference Canceller for CDMA Mobile Communications

    Kazuhiko Fukawa

    IEEE Vehicular Tech. Conf. Spring   3.04   2000

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  • An orthogonal successive interference canceller for the downlink communications

    Kazuhiko Fukawa

    IEEE Globecom 2000   847 - 851   2000

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  • Orthogonalizing Matched Filter (OMF) detection for DS-CDMA mobile radio systems

    K. Fukawa, H. Suzuki

    IEEE Transactions on Vehicular Technology   48 ( 1 )   188 - 197   1999

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  • Orthogonalizing Matched Filter (OMF) detection for DS-CDMA mobile radio systems

    K. Fukawa, H. Suzuki

    IEEE Transactions on Vehicular Technology   48 ( 1 )   188 - 197   1999

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  • A Space/Time Pre-equalization Technique for Down-link Signal Transmission in Time-Division-Duplex (TDD) Mobile Multimedia Communications

    Kazuhiko Fukawa

    European Signal Proc. Conf.   1349 - 1352   1998

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  • A Space/Time Pre-equalization Technique for Down-link Signal Transmission in Time-Division-Duplex (TDD) Mobile Multimedia Communications

    Kazuhiko Fukawa

    European Signal Proc. Conf.   1349 - 1352   1998

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  • Interference canceling equalizer (ICE) for mobile radio communication

    Kazuhiko Fukawa

    IEEE Transactions on Vehicular Technology   46 ( 4 )   1427 - 1432   1997

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  • Interference canceling equalizer (ICE) for mobile radio communication

    Kazuhiko Fukawa

    IEEE Transactions on Vehicular Technology   46 ( 4 )   1427 - 1432   1997

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  • A Linear Interference Canceller with a Blind Algorithm for CDMA Mobile Communication Systems

    Kazuhiko Fukawa

    IEEE Vehicular Technol. Conf.   208 - 212   1997

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  • A Joint Array Signal Processing Structure and Maximum Likelihood Sequence Estimation in Mobile Radio Communications

    K. Fukawa, T. Matsumoto

    Workshop on Smart Antennas in Wireless Mobile Communi.   177 - 196   1997

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  • A linear interference canceller with a blind algorithm for CDMA mobile communication systems

    H Suzuki, K Fukawa

    1997 IEEE 47TH VEHICULAR TECHNOLOGY CONFERENCE PROCEEDINGS, VOLS 1-3   208 - 212   1997

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    Language：English   Publisher：I E E E  

    This paper proposes a new blind algorithm for a linear interference canceller that can increase the capacity of CDMA cellular systems. Orthogonalizing Matched Filter (OMF) is one of the effective linear interference cancellers. OMF employs the Constrained Minimum Mean Square (CMMS) criteria for controlling the combining coefficients, and operates as the decorrelator, or the orthogonalizing filter, under the interference dominant condition and as the matched filter in the noise dominant condition. The new blind algorithm evaluates a steering vector which is essential for achieving good cancelling performance. Singular Value Decomposition (SVD) of the received signal correlation matrix constitutes a time-varying code vector space, and the steering vector embedded in that space is obtained and utilized. The effectiveness of the blind method is verified by computer simulations under non-fading and fading environments.

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  • A Joint Array Signal Processing Structure and Maximum Likelihood Sequence Estimation in Mobile Radio Communications

    K. Fukawa, T. Matsumoto

    Workshop on Smart Antennas in Wireless Mobile Communi.   177 - 196   1997

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  • Influence of long code auto-correlation on RAKE reception performance in DS-CDMA mobile communications

    H Suzuki, K Fukawa

    IEEE ISSSTA '96 - IEEE FOURTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES & APPLICATIONS, PROCEEDINGS, VOLS 1-3   1034 - 1038   1996

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    Language：English   Publisher：IEEE  

    This paper investigates the influence of long codes on RAKE reception in DS-CDMA mobile radio communications. Conventional DS-CDMA mobile communication systems employ long codes in order to ''whiten'' the interference signals from other cells. The conventional long code randomizes not only the undesired signals but also the different delay components of the desired signal which, therefore, become noises and are not combined in RAKE processing. This phenomena impairs RAKE performance. A method is proposed in order to reduce this impairment by introducing a new long code with higher correlation between chip intervals. An analysis shows the relationship between the auto-correlation and de-spread signals, and its influence on BER performance. Finally, computer simulations verify the effectiveness of the proposed method.

    Web of Science

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  • A blind algorithm and its application to interference cancelling equalizer for mobile radio communication

    Kazuhiko Fukawa

    Aachener Kolloquium Siganltheorie   501 - 504   1996

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  • Influence of Long Code Auto-correlation on RAKE Reception Performance in DS-CDMA Moblie Communications

    Kazuhiko Fukawa

    IEEE Inter. Sym. Spread Spectrum Techni. Appli.   1034 - 1038   1996

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  • A blind algorithm and its application to interference cancelling equalizer for mobile radio communication

    Kazuhiko Fukawa

    Aachener Kolloquium Siganltheorie   501 - 504   1996

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  • BER performance of Orthogonalizing Matched Filter (OMF) in mobile DS-CDMA systems

    K. Fukawa, H. Suzuki

    1995 Fourth IEEE International Conference on Universal Personal Communication   42 - 46   1995

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  • BER performance of orthogonalizing matched filter (OMF) in mobile DS-CDMA systems

    FUKAWA K.

    IEEE ICUPC 1995   42 - 46   1995

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  • ディジタル移動無線における逐次最小２乗形タイミング同期の基本特性

    府川和彦, 鈴木

    電子情報通信学会論文誌 (B-II)   J76-B-II ( 7 )   492 - 502   1995

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  • BLIND INTERFERENCE CANCELING EQUALIZER FOR MOBILE RADIO-COMMUNICATIONS

    K FUKAWA, H SUZUKI

    IEICE TRANSACTIONS ON COMMUNICATIONS   E77B ( 5 )   580 - 588   1994.5

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    Language：English   Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG  

    This paper proposes a new adaptive Interference Cancelling Equalizer (ICE) with a blind algorithm. From a received signal, ICE not only eliminates inter-symbol interference, but also cancels co-channel interference. Blind ICE can operate well even if training signals for the interference are unknown. First, training signal conditions for applying blind ICE are considered. Next, a theoretical derivation for blind ICE is developed in detail by applying the maximum likelihood estimation theory. It is shown that RLS-MLSE with diversity, which is derived for mobile radio equalizers, is also effective for blind ICE. Computer simulations demonstrate the 40 kb/s QDPSK transmission performance of Blind ICE as a blind canceller with two branch diversity reception under Rayleigh fading in a single interference environment. The simulations assume synchronous training; the canceller is trained for the desired signal but not for the interference signals. Blind ICE can be successfully achieved at more than - 10 dB CIR values when average Eb/No is 15 dB and a maximum Doppler frequency is 40 Hz.

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  • COHERENT HYBRID DS-FFH CDMA WITH ADAPTIVE INTERFERENCE CANCELING FOR CELLULAR MOBILE COMMUNICATIONS

    S TOMISATO, K FUKAWA, H SUZUKI

    IEICE TRANSACTIONS ON COMMUNICATIONS   E77B ( 5 )   589 - 597   1994.5

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    This paper proposes Coherent-HYBrid Direct-Sequence Fast-Frequency-Hopping (CHYB-DS-FFH) CDMA with Adaptive Interference Cancelling (AIC) for cellular mobile communications. The features of CHYB-DS-FFH are symbol-by-symbol frequency diversity and low chip-rate DS multiplexing; both of which are based on a coherent FFH modulation and demodulation scheme. The combination of coherent FFH, space diversity, and AIC is very effective for reducing the performance degradation due to interference. Computer simulations demonstrate BER performance of a 2 hop 500-kHz-interval frequency hopping system using (i) a linear canceller or (ii) a nonlinear canceller. Both systems employ the two branch space diversity reception of 10 kb/s QPSK with FFH over a 1 MHz system bandwidth. In quasi-static channels, the average BER performance is 10(-2) with average E(b)/N0 less than 8 dB. In dynamic fading channels under full interference conditions, CHYB-DS-FFH with the linear adaptive interference canceller realizes a BER of 10(-2) at the average E(b)/N0 of 15 dB with maximum Doppler frequency f(D) of 5 Hz, whereas CHYB-DS-FFH with the non-linear adaptive interference canceller achieves the same BER at the average E(b)/N0 of 15 dB with f(D) equal to 30 Hz.

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  • Orthogonalizing Matched Filter (OMF) detection for DS-CDMA mobile radio systems

    K. Fukawa, H. Suzuki

    IEEE Globecomm 94   385 - 389   1994

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  • Coherent frequency hopping multiple access (CFHMA) for spectrally efficient mobile communications

    Kazuhiko Fukawa

    Wireless 94   276 - 283   1994

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  • 周波数選択性フェージング移動無線チャネルにおける等化・遅延検波切替受信方式 -ディレイースプレッド検出と適応受信制御-

    府川和彦

    電子情報通信学会論文誌 (B-II)   J77-B-II ( 4 )   191 - 201   1994

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  • Interference canceling equalizer (ICE) for mobile radio communications

    Kazuhiko Fukawa

    IEEE International Conference on Communications   1427 - 1432   1994

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  • Blind interference cancelling equalizer for mobile radio communications

    K. Fukawa, H. Suzuki

    IEICE Trans. Commun.   E77-B ( 5 )   580 - 588   1994

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  • Orthogonalizing Matched Filter (OMF) detection for DS-CDMA mobile radio systems

    K. Fukawa, H. Suzuki

    IEEE Globecomm 94   385 - 389   1994

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  • Coherent frequency hopping multiple access (CFHMA) for spectrally efficient mobile communications

    Kazuhiko Fukawa

    Wireless 94   276 - 283   1994

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  • Adaptive Interference Canceller Based upon RLS - MLSE

    YOSHINO Hitoshi, FUKAWA Kazuhiko, SUZUKI Hiroshi

    The Transactions of the Institute of Electronics,Information and Communication Engineers. B-(0xF9C2)   J77-B-II ( 2 )   74 - 84   1994

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    CiNii Books

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  • コヒーレントハイブリッドDS-FFH CDMA方式

    府川和彦

    電子情報通信学会論文誌 (B-II)   J77-B-II ( 1 )   1 - 10   1994

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  • Interference canceling equalizer (ICE) for mobile radio communications

    Kazuhiko Fukawa

    IEEE International Conference on Communications   1427 - 1432   1994

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  • 遅延検波形適応系列推定（DD-ASE）-周波数選択性フェージング移動無線伝送特性-

    府川和彦

    電子情報通信学会論文誌 (B-II)   J76-B-II ( 2 )   71 - 78   1993

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  • 多重遅延検波形適応系列推定(MDD-ASE) -周波数選択性フェージング移動無線伝送特性-

    府川和彦

    電子情報通信学会論文誌 (B-II)   J76-B-II ( 7 )   573 - 583   1993

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  • 逐次最小２乗形適応最尤系列推定(RLS-MLSE) - 最尤推定理論の移動無線への応用-

    府川和彦, 鈴木

    電子情報通信学会論文誌 (B-II)   J76-B-II ( 4 )   202 - 214   1993

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  • Coherent hybrid DS-FFH CDMA with adaptive interference canceling for cellular communications

    Kazuhiko Fukawa

    IEICE Proceeding Joint Technical Conf. on Communi. Syst. & Computer Communi. ' 93   1 ( 5 )   246 - 251   1993

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  • Coherent hybrid DS-FFH CDMA with adaptive interference canceling for cellular communications

    Kazuhiko Fukawa

    IEICE Proceeding Joint Technical Conf. on Communi. Syst. & Computer Communi. ' 93   1 ( 5 )   246 - 251   1993

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  • 移動通信用RLS型適応等化器に関する動特性解析

    府川和彦

    電子情報通信学会論文誌 (B-II)   J76-B-II ( 4 )   189 - 201   1993

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  • 移動無線における逐次最小２乗形適応最尤系列推定 (RLS-MLSE )の特性

    府川和彦, 鈴木

    電子情報通信学会論文誌 (B-II)   J75-B-II ( 8 )   535 - 546   1992

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  • 無線伝搬路の高次状態変数モデルにおける逐次最小２乗形適応最尤系列推定

    府川和彦, 鈴木

    電子情報通信学会論文誌 (B-II)   J75-B-II ( 7 )   415 - 423   1992

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  • ADAPTIVE EQUALIZATION WITH RLS-MLSE FOR FAST FADING MOBILE RADIO CHANNELS

    H YOSHINO, K FUKAWA, H SUZUKI

    1992 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-6   501 - 504   1992

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    Language：English   Publisher：I E E E  

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  • Adaptive equalization with RLS-MLSE for frequency selective fast fading mobile radio channels

    K. Fukawa, H. Suzuki

    IEEE Globecomm 91   16.6.1-16.6.5   1991

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  • Adaptive equalization with RLS-MLSE for frequency selective fast fading mobile radio channels

    K. Fukawa, H. Suzuki

    IEEE Globecomm 91   16.6.1-16.6.5   1991

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Presentations

  • マルチDSPによるOFDM用適応等化シミュレータ

    無線通信システム研究会  2003 

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  • ML detection of MIMO-OFDM signals in selected spatial-temporal subspace for prewhitening with recursive eigenvalue decomposition in mobile interference environments

    IEEE Vehic. Technol. Conf. 2007-Spring  2007 

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  • パケット移動通信用アダプティブアレーおよび等化器のチップレベル結合処理

    2003 

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  • MIMO-TDD システムにおける同一チャネル干渉を補償するプリコーディング方式

    無線通信システム研究会  2007 

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  • 移動無線環境におけるCIRの動的確率モデル -無線パケットへの応用-

    無線通信システム研究会  2003 

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  • Linear precoding with minimum BER criterion for MIMO-OFDM systems employing ML detection

    2007 IEEE Intern. Conf. on Communi. (ICC 2007)  2007 

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  • 移動通信用TCP/IPパケット長のマルコフモデルによる最適化

    2003 

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  • MIMO-OFDM transmission employing subcarrier-block phase hopping for PAPR reduction

    IEEE Vehic. Technol. Conf. 2007-Spring  2007 

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    Presentation type：Poster presentation  

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  • マルチチャネルコードレス電話システムの一提案

    2003 

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  • 送信電力増幅非線形性に起因するMIMO-OFDM伝送特性の劣化に対するサブキャリア位相ホッピング SLM による改善効果

    無線通信システム研究会  2007 

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  • Packet error rate analysis and its reduction by known bits insertion for turbo code in 100Mbps OFCDM system

    2003 

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  • MLSE for DSTBC-OFDM detection with channel estimation by blind linear prediction and subcarriers interpolation

    2007 IEEE Intern. Conf. on Communi. (ICC 2007)  2007 

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  • Analysis of packet transmission for ad-hoc mobile wireless networks

    2003 

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  • スキャッタードパイロットOFDM受信機における適応タップ選択と平滑化を用いる高精度チャネル推定

    2007年電子情報通信学会総合大会  2007 

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  • ガードインターバルを超えるマルチパス遅延に対するOFDMターボ等化

    無線通信システム研究会  2003 

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  • 複数シンボル区間FFTによるOFDM適応等化器

    無線通信システム研究会  2003 

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  • Parameter estimation employing recursive eigenvalue decomposition for MIMO-OFDM using maximum likelihood detector with array combining

    無線通信システム研究会  2006 

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  • BCJRアルゴリズムに基づく適応チャネル推定を用いたＭＡＰ信号検出

    無線通信システム研究会  2006 

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  • Iterative Receiver Employing Multiuser Detection and Channel Estimation for MIMO-OFDM IDMA

    IEEE Vehic. Tech. Conf. in Taipei  2010 

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  • MIMO-OFDM turbo receiver employingiterative soft decision directed channel estimation in fast time-varying multipath fading channels

    11-th International OFDM-workshop  2006 

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  • スキャッタード・パイロット OFDM 受信機に用いる繰り返し検出と適応タップ選択チャネル推定

    無線通信システム研究会  2006 

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  • Suboptimal Signal Detection for Spatially-Correlated MIMO Channels

    2010 

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  • Subcarrier phase hopping MIMO-OFDM transmission employing enhanced selected mapping for PAPR reduction

    Personal Indoor Mobile Radio Communi.  2006 

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  • PAPR Reduction Method for Block Diagonalization in Multiuser MIMO-OFDM Systems

    IEEE Vehic. Tech. Conf. in Taipei  2010 

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  • Scattered pilot OFDM receiver with iterative detection and channel estimation employing adaptive tap selection

    11-th International OFDM-workshop  2006 

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  • 固有モードMIMO-OFDM伝送におけるSLM・クリッピングによる非線形歪み低減法

    無線通信システム研究会（ＲＣＳ）  2010 

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  • Multiuser detection with an adaptive array antenna controlled by orthogonal projection CMA

    IEEE Globecom 2002  2002 

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  • ML Detection with Blind Linear Prediction for Differential Space-Time Block Code Systems

    Vehic. Technol. Conf. 2006-Spring  2006 

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  • 移動無線伝送路実験用ディジタルシミュレータ

    電子情報通信学会通信ソサイエティ大会  2001 

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  • Suboptimal Maximum Likelihood Detection Using Gradient-based Algorithm for MIMO Channels

    Vehic. Technol. Conf. 2006-Spring  2006 

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  • DS-CDMAパケット移動通信システムにおけるアダプティブアレーおよび等化器のチップレベル結合処理

    無線通信システム研究会  2002 

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  • サブキャリア・ブロック位相ホッピングによりPAPRを低減するMIMO-OFDM伝送

    無線通信システム研究会  2006 

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  • Recursive least squares channel estimator with smoothing and removing for iterative-MAP receiver of MIMO-OFDM mobile communications

    Intrn. Conf. on Communi. (ICC 2006)  2006 

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  • 位相パターン制御によりPAPRを低減したサブキャリア位相ホッピングMIMO-OFDM伝送方式

    無線通信システム研究会  2006 

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  • Multiuser detection with an adaptive array antenna controlled by orthogonal projection CMA

    IEEE Globecom 2002  2002 

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  • Parallel channel estimator for iterative MAP receiver using message-passing algorithm

    IEEE Globecom 2006 Technical Symposia  2006 

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  • An MMSE based calibration of LINC transmitter

    IEEE 55th Vehic. Tech. Conf, Birmingham  2002 

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  • ソフト判定指向形チャネル推定を用いた高効率 OFDM 伝送における受信処理の繰り返し制御法

    2006年総合大会  2006 

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  • 移動通信における通信路情報を用いた最適送信システム

    2002年電子情報通信学会総合大会  2002 

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  • MIMO-OFDM 移動通信用 MAP 受信機におけるファクターグラフに基づく逐次伝送路推定

    無線通信システム研究会  2006 

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  • 直交射影CMAで制御されるアダプティブアレーを用いたマルチユーザ・ディテクション

    無線通信システム研究会  2002 

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  • 有相関フェージング通信路における MIMO ビット誤り率のユニオン・バウンド

    2006年総合大会  2006 

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  • An MMSE based calibration of LINC transmitter

    IEEE 55th Vehic. Tech. Conf, Birmingham  2002 

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  • 位相パターン制御によりPAPRを低減したサブキャリア位相ホッピング16QAM-MIMO-OFDM伝送

    2006年総合大会  2006 

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  • 最小2乗法によるLINC用送信電力増幅器の振幅・位相バランス調整法

    電子情報通信学会総合大会  2002 

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  • サブキャリア間干渉用逐次キャンセラを用いた MIMO-OFDM ターボ等化器

    2006年総合大会  2006 

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  • Blind equalization with fractional sampling metric combining for avoiding channel estimate ambiguity in mobile radio

    Personal Indoor Mobile Radio Communi.  2006 

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  • Doherty増幅器とディジタル変調器の結合により各ブランチへの入力電力分配を最適化した移動無線用高効率線形電力増幅器

    無線通信システム研究会  2003 

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  • マルチユーザ検出に基づくARQを用いた移動通信用OFDMパケット伝送方式

    2003 

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  • Parallel channel estimator for iterative MAP receiver using message-passing algorithm

    Globecom 2006  2006 

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  • Markov model analysis on the optimal TCP/IP packet length in mobile communication systems

    Intern. Symp. Wireless Personal Multimedia Commuini. (WPMC2003)  2003 

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  • Subcarrier phase hopping MIMO-OFDM transmission employing enhanced selected mapping for PAPR reduction

    2006 

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  • Characterization of power efficient PHEMT transmitter amplifiers for portable mobile communications

    6th Intern. Symp. Wireless Personal Multimedia Commuini.(WPMC2003)  2003 

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  • PAPR を低減するサブキャリア位相ホッピングを用いた MIMO-OFDM 送信機の FPGA 実装

    無線通信システム研究会  2007 

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  • マルチユーザ検出とメトリック合成によるARQを用いた移動通信用パケットOFDM伝送方式

    2004 

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  • Scattered pilot OFDM reception employing turbo interference cancellation for ICI caused by fast fading fluctuations

    The First IEEE Asia Pacific Wireless Communi. Sympo. (APWCS)  2004 

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  • An Accurate OFDM timing recovery with timing offset compensation by channel estimation results for mobile packet transmission

    The First IEEE Asia Pacific Wireless Communi. Sympo. (APWCS)  2004 

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  • 同一チャネル干渉環境におけるMIMO-OFDM MAP 受信方式

    通信システム研究会  2004 

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  • ガード・インターバルを超える受信タイミング偏差を補償するマルチユーザ検出を用いたOFCDMA上りパケット伝送方式

    無線通信システム研究会  2004 

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  • Antenna switched diversity with channel prediction for frequency-offset transmit diversity --- applied to OFDM mobile communication systems ---

    通信システム研究会  2004 

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  • 同一チャネル干渉環境におけるMIMO-OFDM MAP 受信方式

    2004 

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  • Antenna switched diversity with channel prediction for frequency-offset transmit diversity --- applied to OFDM mobile communication systems ---

    通信システム研究会  2004 

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  • Scattered pilot OFDM reception employing turbo interference cancellation for ICI caused by fast fading fluctuations

    The First IEEE Asia Pacific Wireless Communi. Sympo. (APWCS)  2004 

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  • Gaussian multicarrier transmission system with turbo detection for power line communications

    Intern. Symp. Power Line Communi.  2004 

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  • A Frequency-Offset Transmission Diversity Scheme for OFDM Mobile Communication Systems

    IEICE General Conference 2004  2004 

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  • An OFDM turbo equalizer for scattered pilot signals in multipath environments with delay difference greater than guard interval

    IEEE Vehicular Technol. Conf. 2004-Spring  2004 

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  • A MIMO-OFDM maximum likelihood reception scheme in co-channel interference environments

    2004 

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  • MIMO-OFDM transmission employing subcarrier-block phase hopping for PAPR reduction

    IEEE Vehic. Technol. Conf. 2007-Spring  2007 

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  • サブキャリア位相ホッピングを用いたMIMO-OFDM伝送

    2004年電子情報通信学会ソサイエティ大会  2004 

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  • ML detection of MIMO-OFDM signals in selected spatial-temporal subspace for prewhitening with recursive eigenvalue decomposition in mobile interference environments

    IEEE Vehic. Technol. Conf. 2007-Spring  2007 

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  • OFCDMA Turbo Receiver Compensating for Received Timing Deviation Greater than Guard Interval in Reverse Link Packet Transmission

    9-th International OFDM-workshop  2004 

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  • Linear precoding with minimum BER criterion for MIMO-OFDM systems employing ML detection

    2007 IEEE Intern. Conf. on Communi. (ICC 2007)  2007 

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  • 430 Mbps reduced-PAPR MIMO-OFDM transceiver on FPGA-board simulator

    12th International OFDM-Workshop  2007 

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  • OFDM伝送におけるサブキャリア位相ホッピング送信ダイバーシチ方式

    2004年電子情報通信学会ソサイエティ大会  2004 

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  • MLSE for DSTBC-OFDM detection with channel estimation by blind linear prediction and subcarriers interpolation

    2007 IEEE Intern. Conf. on Communi. (ICC 2007)  2007 

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  • 長遅延マルチパス伝搬環境におけるソフト判定指向形チャネル推定を用いたOFDMターボ等化器

    2004年電子情報通信学会ソサイエティ大会  2004 

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  • MIMO無線通信システムにおけるモンテカルロ法を用いた近似MLD検出

    無線通信システム研究会  2007 

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  • Analysis of packet transmission for ad-hoc mobile wireless networks

    2003 

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  • Channel estimation using differential model of fading fluctuation for EM algorithm applied to OFDM MAP detection

    IEEE 18th International Symposium on Personal, Indoor Mobile Radio Communi.  2007 

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  • 電力線通信用ガウス形マルチキャリア変復調方式

    通信システム研究会  2004 

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  • MIMO 伝送路における空間相関を考慮した 2 次ペアワイズ誤り確率を用いる精度の高い平均 BER バウンド

    無線通信システム研究会  2007 

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  • Chip-based joint processing adaptive array and equalizer for DS-CDMA packet mobile communication systems

    2003 

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  • マルチユーザ検出によるビットLLR合成ARQを用いた適応OFDM変調無線パケット方式

    無線通信システム研究会  2007 

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  • Packet error rate analysis and its reduction by known bits insertion for turbo code in 100Mbps OFCDM system

    2003 

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  • EMアルゴリズムを適用したOFDM移動通信用MAP検出におけるフェージング変動の微分係数モデルを用いたチャネル推定

    無線通信システム研究会  2007 

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  • Characterization of power efficient PHEMT transmitter amplifiers for portable mobile communications

    6th Intern. Symp. Wireless Personal Multimedia Commuini.(WPMC2003)  2003 

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  • MIMO-OFDM同一チャネル干渉環境におけるマルチおよびシングルユーザ検出切替制御

    無線通信システム研究会  2007 

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  • MIMO-OFDM receiver with turbo equalization for multipath environments with the delay difference greater than guard interval

    Intr. OFDM Workshop 2003  2003 

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  • FPGA を用いたOFDM 伝送用ハードウェア・シミュレータ

    2004年電子情報通信学会ソサイエティ大会  2004 

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  • ガード・インターバルを超えるマルチパス遅延環境における簡略化MIMO-OFDMターボ等化器

    2004年電子情報通信学会総合大会  2004 

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  • OFCDMA上りパケット伝送におけるガード・インターバルを超える受信タイミング偏差を補償するマルチユーザ検出器

    2004年電子情報通信学会総合大会  2004 

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  • 処理区間を適応制御する複数のFFTを用いたOFDM受信方式

    2004年電子情報通信学会総合大会  2004 

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  • Decision directed phase noise compensator for millimeter-wave OFDM systems

    International OFDM-Workshop 2008  2008 

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  • Gaussian multicarrier transmission system with turbo detection for power line communications

    Intern. Symp. Power Line Communi.  2004 

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  • A Frequency-Offset Transmission Diversity Scheme for OFDM Mobile Communication Systems

    IEICE General Conference 2004  2004 

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  • 固有モードMIMO-OFDM伝送における送信電力増幅時のPAPR低減法の効果

    電子情報通信学会ソサイエティ大会  2008 

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  • An OFDM turbo equalizer for scattered pilot signals in multipath environments with delay difference greater than guard interval

    IEEE Vehicular Technol. Conf. 2004-Spring  2004 

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  • OFDM modulation with Gaussian shaping and its FPGA transceiver

    International OFDM-Workshop 2008  2008 

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  • A MIMO-OFDM maximum likelihood reception scheme in co-channel interference environments

    2004 

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  • ミリ波帯ローカルVCO位相雑音補償のための復調信号処理

    2008年電子情報通信学会ソサイエティ大会，シンポジウム  2008 

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  • OFDM伝送実験用FPGAシミュレータ

    YRP 移動体通信産学官交流シンポジウム2004  2004 

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  • MAP receiver with spatial filters for suppressing cochannel interference in MIMO-OFDM mobile communications

    IEEE 68th Vehic. Tech. Conf.  2008 

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  • Systolic OMF-RAKE: Linear Interference Canceller Utilizing Systolic Array for Mobile Communications

    2004 

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  • Performance of iterative multiuser detection with channel estimation for MC-IDMA and comparison with chip-interleaved MC-CDMA

    IEEE Globecom 2008  2008 

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  • Antenna switched diversity reception with channel prediction in frequency-offset transmit diversity system for OFDM mobile communications

    Wireless Pers. Mobile Communi. (WPMC2004)  2004 

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  • ミリ波帯シングルキャリア周波数領域等化における繰り返し判定指向形位相雑音補償

    電子情報通信学会技術報告  2008 

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  • OFDM Mobile Packet Transmission System with Multiuser Detection and Metric Combining ARQ

    2004 

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  • Low-complexity algorithm for log likelihood ratio in coded MIMO-OFDM communications

    IEEE Globecom 2009  2009 

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  • Intersymbol Interference Characteristics of Single Side-Band QPSK and Its Turbo Equalizer Performance

    無線通信システム研究会  2005 

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  • Decision-directed phase noise compensation for millimeter-wave single carrier transmission systems with frequency-domain equalization

    EuWiT (EuMW2009)  2009 

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  • 長遅延マルチパス伝搬環境における OFDM ターボ等化器の異なる変調方式，符号化率および伝搬モデルにおける特性

    無線通信システム研究会  2005 

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  • Experimental evaluation of decision-directed phase noise compensation for millimeter-wave single carrier systems

    NTU-Tokyo Tech Joint Student Workshop 2009  2009 

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  • MIMOパケット伝送方式における通信路容量とスループットの比較

    通信方式研究会  2005 

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  • PAPR reduction method for block diagonalization in multiuser MIMO-OFDM systems

    NTU-Tokyo Tech Joint Student Workshop 2009  2009 

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  • サブキャリア位相ホッピングMIMO-OFDM伝送方式

    2005 

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  • AF/DF切替方式およびビットLLR合成受信による高信頼OFDM移動無線中継システム

    通信システム研究会  2009 

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  • 超高速無線通信を実現するための高度信号処理

    ワイヤレス・テクノロジー・パーク  2010 

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  • An FPGA-board simulator for MIMO-OFDM transmission

    10-th International OFDM-workshop  2005 

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  • Maximum likelihood detection with blind linear prediction for mobile radio communication systems with differential space-time block code

    無線通信システム研究会  2005 

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  • Suboptimal Signal Detection for Spatially-Correlated MIMO Channels

    2010 

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  • A MIMO-OFDM transmission scheme employing subcarrier phase hopping

    5th Int'l. Workshop Digest on Multi-Carrier Spread Spectrum(MC-SS)  2005 

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  • 再送制御とスケジューリングを行うOFDMA上り回線におけるハイブリッド合成型マルチユーザ検出

    電子情報通信学会技術報告  2010 

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  • An OFDM turbo equalizer with reduced number of iterations in mobile multipath environments with large delay spread

    10-th International OFDM-workshop  2005 

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  • PAPR reduction methods for eigenmode MIMO-OFDM transmission

    IEEE Vehic. Tech. Conf.  2009 

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  • バンドパス・サンプリング法における最小２乗法による直交成分推定

    無線通信システム研究会  2005 

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  • Performance comparison of OFDM and SC-FDE employing decision-directed phase noise compensation in 60-GHz millimeter-wave systems

    Global Symposium on Millimeter Waves  2009 

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  • 電力に関するWSSUS条件を満たすパルス列を用いた移動無線レイリーフェージングシミュレータの諸特性

    無線通信システム研究会  2005 

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  • ブロック対角化MIMO-OFDMにおける低演算量PAPR低減法

    2010年電子情報通信学会総合大会  2010 

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  • Intersymbol Interference Characteristics of Single Side-Band QPSK and Its Turbo Equalizer Performance

    無線通信システム研究会  2005 

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  • 60 GHzシングルキャリア伝送実験系における判定指向形位相雑音補償

    2010年電子情報通信学会総合大会  2010 

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  • MIMO 伝送路における到来角分布による空間相関を考慮した平均 BER に関するユニオン・バウンド

    無線通信システム研究会  2006 

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  • 同一チャネル干渉を抑圧するMIMO-OFDM伝送におけるZadoff-Chu系列チャネル推定

    2010年電子情報通信学会総合大会  2010 

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  • Linear interference canceller utilizing systolic array for DS-CDMA mobile communications

    IEEE Vehic. Technol. Conf. 2005-Spring  2005 

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  • 超直交畳み込み符号を用いたMIMO-OFDM IDMA

    2010年電子情報通信学会総合大会  2010 

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  • Iterative-MAP adaptive detection via the EM algorithm for LDPC-coded MIMO-OFDM mobile communications in fast fading channels

    IEEE Vehic. Technol. Conf. 2005-Spring  2005 

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  • PAPR Reduction Method for Block Diagonalization in Multiuser MIMO-OFDM Systems

    IEEE Vehic. Tech. Conf. in Taipei  2010 

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  • Iterative Receiver Employing Multiuser Detection and Channel Estimation for MIMO-OFDM IDMA

    IEEE Vehic. Tech. Conf. in Taipei  2010 

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  • High-efficiency Doherty linear amplifier with backoff control for mobile communications

    IEEE Vehic. Technol. Conf. 2005-Spring  2005 

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  • Blind equalization with fractional sampling metric combining for avoiding channel estimate ambiguity in mobile radio

    Personal Indoor Mobile Radio Communi.  2006 

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  • NMIMO-OFDM移動通信における通信路情報アナログフィードバック方式

    無線通信システム研究会（ＲＣＳ）  2010 

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  • Parallel channel estimator for iterative MAP receiver using message-passing algorithm

    Globecom 2006  2006 

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  • 同一チャネル干渉条件下のMIMO-OFDM伝送における最小BER規範送信プリコーディングと空間フィルタを用いる最尤受信 ---Zadoff-Chu系列を用いたチャネル推定---

    無線通信システム研究会  2010 

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  • Subcarrier phase hopping MIMO-OFDM transmission employing enhanced selected mapping for PAPR reduction

    2006 

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  • 固有モードMIMO-OFDM伝送におけるSLMとクリッピングによる帯域外輻射電力の抑圧

    2010年電子情報通信学会総合大会  2010 

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  • Parallel channel estimator for iterative MAP receiver using message-passing algorithm

    IEEE Globecom 2006 Technical Symposia  2006 

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  • MIMO-OFDMにおけるPAPR抑圧技術による電力付加効率の改善

    無線通信システム研究会（ＲＣＳ）  2010 

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  • MIMO 伝送路における到来角分布による空間相関を考慮した平均 BER に関するユニオン・バウンド

    電子情報通信学会技術報告  2006 

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  • Decision-directed phase noise compensation for millimeter-wave single carrier transmission systems with frequency-domain equalization

    EuWiT (EuMW2009)  2009 

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  • An Accurate OFDM timing recovery with timing offset compensation by channel estimation results for mobile packet transmission

    The First IEEE Asia Pacific Wireless Communi. Sympo. (APWCS)  2004 

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  • ミリ波帯SC-FDE伝送における判定指向形位相雑音補償実験系の特性

    電子情報通信学会ソサイエティ大会  2009 

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  • 高効率パイロット・シンボルによるソフト判定指向形チャネル推定を用いた OFDM パケット伝送

    無線通信システム研究会  2005 

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  • ミリ波OFDM伝送における判定指向形位相雑音補償法のFPGAシミュレータ

    電子情報通信学会ソサイエティ大会  2009 

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  • リアルゼロ系列直交同期検波器

    無線通信システム研究会（ＲＣＳ）  2009 

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  • FPGAによるMIMO-OFDM伝送ベースバンド・シミュレータ

    ソフトウェア無線研究会  2005 

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  • Maximum likelihood detection with blind linear prediction for mobile radio communication systems with differential space-time block code

    無線通信システム研究会  2005 

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  • ブロック対角化マルチユーザMIMO-OFDM伝送におけるPAPR低減法

    無線通信システム研究会（ＲＣＳ）  2009 

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  • An OFDM turbo equalizer with reduced number of iterations in mobile multipath environments with large delay spread

    10-th International OFDM-workshop  2005 

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  • ソフトウェア無線機用研究開発プラットフォーム

    ソフトウェア無線研究会（ＳＲ）  2009 

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  • An FPGA-board simulator for MIMO-OFDM transmission

    10-th International OFDM-workshop  2005 

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  • MIMO-OFDM IDMAにおける繰り返し結合処理受信機の特性

    電子情報通信学会ソサイエティ大会  2009 

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  • 高効率パイロット・サブキャリア・シンボルを用いた OFDM 伝送におけるソフト判定指向形チャネル推定

    2005年電子情報通信学会ソサイエティ大会  2005 

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  • リアルゼロ系列を用いた直交同期検波器

    電子情報通信学会ソサイエティ大会  2009 

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  • パンクチャ畳み込み符号を用いた 16QAM における MIMO-OFDM ターボ等化器

    2005年電子情報通信学会ソサイエティ大会  2005 

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  • 4x4以上の固有モードMIMO-OFDM伝送における非線形増幅歪とPAPR低減効果

    電子情報通信学会ソサイエティ大会  2009 

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  • 最小ビット誤り率規範に基づく MIMO-OFDM プリコーディング

    無線通信システム研究会  2005 

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  • ブロック対角化マルチユーザMIMO-OFDM伝送におけるSLMの効果

    電子情報通信学会ソサイエティ大会  2009 

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  • A MIMO-OFDM transmission scheme employing subcarrier phase hopping

    5th Int'l. Workshop Digest on Multi-Carrier Spread Spectrum(MC-SS)  2005 

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  • PAPR reduction methods for eigenmode MIMO-OFDM transmission

    IEEE Vehic. Tech. Conf.  2009 

    　More details

  • Linear interference canceller utilizing systolic array for DS-CDMA mobile communications

    IEEE Vehic. Technol. Conf. 2005-Spring  2005 

    　More details

  • Performance comparison of OFDM and SC-FDE employing decision-directed phase noise compensation in 60-GHz millimeter-wave systems

    Global Symposium on Millimeter Waves  2009 

    　More details

  • Iterative-MAP adaptive detection via the EM algorithm for LDPC-coded MIMO-OFDM mobile communications in fast fading channels

    IEEE Vehic. Technol. Conf. 2005-Spring  2005 

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  • MIMO-OFDM IDMAにおけるマルチユーザ検出とチャネル推定の繰り返し結合処理

    無線通信システム研究会（ＲＣＳ）  2009 

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  • MIMO-OFDM IDMAにおける繰り返しマルチユーザ検出

    無線通信システム研究会（ＲＣＳ）  2009 

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  • High-efficiency Doherty linear amplifier with backoff control for mobile communications

    IEEE Vehic. Technol. Conf. 2005-Spring  2005 

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  • MIMOパケット伝送方式における通信路容量およびスループットの特性

    2005年電子情報通信学会総合大会  2005 

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  • 同一チャネル干渉を抑圧する時空間フィルタを用いたMIMO-OFDM最尤検出

    無線通信システム研究会  2009 

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  • ガウス波形マルチキャリア伝送方式におけるターボ等化器の特性

    2005年電子情報通信学会総合大会  2005 

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  • 同一チャネル干渉条件における最小BER規範MIMO-OFDMプリコーディング方式

    無線通信システム研究会  2009 

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  • サブキャリア位相ホッピング MIMO-OFDM 伝送の FPGA 実装

    2005年電子情報通信学会総合大会  2005 

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  • 送信プリコーディングと空間フィルタにより同一チャネル干渉を抑圧するMIMO-OFDM伝送方式

    2009年電子情報通信学会総合大会  2009 

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  • 一般逆行列によるキャリヤ推定を用いた分数間隔ブラインド形最尤系列推定

    無線システム研究会  2005 

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  • MIMO-OFDM IDMA における繰り返しマルチユーザ検出器の特性評価

    2009年電子情報通信学会総合大会  2009 

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  • MIMO-OFDM 伝送 FPGA シミュレータ

    2005年電子情報通信学会総合大会  2005 

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  • ミリ波帯MIMO-OFDM伝送における判定指向形位相雑音補償

    2009年電子情報通信学会総合大会  2009 

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  • Single sideband QPSK with turbo equalization for mobile communications

    2005 

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  • ミリ波帯シングルキャリア周波数領域等化における判定指向形位相雑音補償

    2009年電子情報通信学会総合大会  2009 

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  • 干渉が支配的な高速フェージング移動無線環境における最適TCPパケットサイズに関するネットワークシミュレータ ns-2 による解析

    無線システム研究会  2005 

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  • 430 Mbps reduced-PAPR MIMO-OFDM transceiver on FPGA-board simulator

    12th International OFDM-Workshop  2007 

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  • Suboptimal Maximum Likelihood Detection Using Gradient-based Algorithm for MIMO Channels

    Vehic. Technol. Conf. 2006-Spring  2006 

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  • 同一チャネル干渉環境におけるMIMO-OFDM最尤受信方式

    2003 

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  • 移動無線通信における異種ストリーム MIMO 伝送のブラインド信号検出

    無線通信システム研究会  2007 

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  • OFDM パケット伝送におけるチャネル推定を用いた高精度タイミング再生

    無線通信システム研究会  2003 

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  • Recursive least squares channel estimator with smoothing and removing for iterative-MAP receiver of MIMO-OFDM mobile communications

    Intrn. Conf. on Communi. (ICC 2006)  2006 

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  • スキャッタードパイロット信号用OFDM ターボ等化受信におけるLMSによる簡略化チャネル推定

    2003年電子情報通信学会ソサイエティ大会  2003 

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  • ML Detection with Blind Linear Prediction for Differential Space-Time Block Code Systems

    Vehic. Technol. Conf. 2006-Spring  2006 

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  • OFDMパケット伝送における高精度パス検出器を用いたタイミング再生

    2003年電子情報通信学会ソサイエティ大会  2003 

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  • MIMO-OFDM turbo receiver employingiterative soft decision directed channel estimation in fast time-varying multipath fading channels

    11-th International OFDM-workshop  2006 

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  • MIMO-OFDM receiver with turbo equalization for multipath environments with the delay difference greater than guard interval

    Intr. OFDM Workshop 2003  2003 

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  • Parameter estimation employing recursive eigenvalue decomposition for MIMO-OFDM using maximum likelihood detector with array combining

    無線通信システム研究会  2006 

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  • ドップラーシフトによるICIを除去するスキャッタードパイロットOFDMターボ干渉キャンセラ

    2003年電子情報通信学会ソサイエティ大会  2003 

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  • Subcarrier phase hopping MIMO-OFDM transmission employing enhanced selected mapping for PAPR reduction

    Personal Indoor Mobile Radio Communi.  2006 

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  • Scattered pilot OFDM receiver with iterative detection and channel estimation employing adaptive tap selection

    11-th International OFDM-workshop  2006 

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  • アンテナアレー合成により同一チャネル干渉を抑圧するMIMO-OFDM最尤受信方式

    2003 

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  • Chip-based joint processing adaptive array and equalizer for DS-CDMA packet mobile communication systems

    2003 

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  • Channel estimation using differential model of fading fluctuation for EM algorithm applied to OFDM MAP detection

    IEEE 18th International Symposium on Personal, Indoor Mobile Radio Communi.  2007 

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  • ドレイン電流の入力電力依存性を考慮した移動通信用高効率電力増幅器モデル

    マイクロ波研究会  2003 

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  • MIMO-OFDM 用サブキャリア位相ホッピング SLM による送信電力増幅器で発生する非線形歪みの耐性効果

    電子情報通信学会ソサイエティ大会  2007 

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  • 高速フェージングによるICIを除去するスキャッタードパイロット信号用OFDMターボ干渉キャンセル受信

    無線通信システム研究会  2003 

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  • マルチユーザ検出によるビットLLR合成ARQを用いたOFDM 変調無線パケット方式

    2007年電子情報通信学会総合大会  2007 

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  • PAPRを低減するサブキャリア位相ホッピングを用いたMIMO-OFDM送信機のFPGAによる実験的検証

    2007年電子情報通信学会総合大会  2007 

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  • Markov model analysis on the optimal TCP/IP packet length in mobile communication systems

    Intern. Symp. Wireless Personal Multimedia Commuini. (WPMC2003)  2003 

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  • FPGA ボードに実装した 64QAM 2×2 MIMO-OFDM 移動無線伝送シミュレータ

    無線通信システム研究会  2007 

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  • ガードインターバルを超えるマルチパス遅延に対するMIMO-OFDMターボ等化

    無線通信システム研究会  2003 

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  • Antenna switched diversity reception with channel prediction in frequency-offset transmit diversity system for OFDM mobile communications

    Wireless Pers. Mobile Communi. (WPMC2004)  2004 

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  • MIMO-OFDMにおけるPAPR低減化パターン高信頼伝送およびそのFPGAオンボード・システム・シミュレータ

    無線通信システム研究会  2008 

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  • 固有モードMIMO-OFDM伝送におけるPAPR低減法

    電子情報通信学会技術報告  2008 

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  • 高速フェージング環境におけるシンボル・インターリーブ逐次チャネル推定を用いたOFDM-MAP信号検出

    通信システム研究会  2008 

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  • チャネル推定を含むターボ信号検出を用いたインターリーブ多元接続方式の移動通信環境における伝送特性

    無線通信システム研究会  2008 

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  • ミリ波帯64QAM-OFDM伝送における位相雑音補償特性

    電子情報通信学会総合大会  2008 

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  • マルチパス遅延が GI を超える高速フェージング環境におけるスキャッタード・パイロットOFDM用ターボ等化受信

    電子情報通信学会総合大会  2008 

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  • 異種ストリームMIMO伝送システムにおけるブラインド信号検出

    2008年電子情報通信学会総合大会  2008 

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  • 符号化MIMO-OFDM準最適検出におけるビット系列対数尤度比計算アルゴリズム

    無線通信システム研究会  2008 

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  • ミリ波帯OFDM伝送における繰り返し判定指向形位相雑音補償

    無線通信システム研究会  2008 

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  • MIMO-OFDM precoder for minimizing BER upper bound of MLD under imperfect CSI

    IEEE Inter. Conf. Communi. 2008  2008 

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  • Performance of iterative multiuser detection with channel estimation for MC-IDMA and comparison with chip-interleaved MC-CDMA

    IEEE Globecom 2008  2008 

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  • MAP receiver with spatial filters for suppressing cochannel interference in MIMO-OFDM mobile communications

    IEEE 68th Vehic. Tech. Conf.  2008 

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  • ミリ波帯シングルキャリア伝送における判定指向形位相雑音補償の実験による評価

    無線通信システム研究会（ＲＣＳ）  2009 

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  • 簡略化マルチユーザ検出器を用いたMIMO-OFDM IDMA繰り返し受信機

    無線通信システム研究会（ＲＣＳ）  2009 

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  • PAPR reduction method for block diagonalization in multiuser MIMO-OFDM systems

    NTU-Tokyo Tech Joint Student Workshop 2009  2009 

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  • Low-complexity algorithm for log likelihood ratio in coded MIMO-OFDM communications

    IEEE Globecom 2009  2009 

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  • MIMO-OFDM precoder for minimizing BER upper bound of MLD under imperfect CSI

    IEEE Inter. Conf. Communi. 2008  2008 

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  • Experimental evaluation of decision-directed phase noise compensation for millimeter-wave single carrier systems

    NTU-Tokyo Tech Joint Student Workshop 2009  2009 

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  • OFDM modulation with Gaussian shaping and its FPGA transceiver

    International OFDM-Workshop 2008  2008 

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  • Decision directed phase noise compensator for millimeter-wave OFDM systems

    International OFDM-Workshop 2008  2008 

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  • OFDM Mobile Packet Transmission System with Multiuser Detection and Metric Combining ARQ

    2004 

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  • Systolic OMF-RAKE: Linear Interference Canceller Utilizing Systolic Array for Mobile Communications

    2004 

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  • OFCDMA Turbo Receiver Compensating for Received Timing Deviation Greater than Guard Interval in Reverse Link Packet Transmission

    9-th International OFDM-workshop  2004 

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Works

  • Study on TDD mobile packet transmission scheme

    2004 - 2007

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  • TDD無線パケット方式の研究

    2004 - 2007

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  • FH-OFDM方式用基本伝送系構築と性能評価の 研究

    2003

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  • 移動通信におけるMIMO通信路伝送技術

    2002

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    Work type：Artistic work  

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  • 移動通信における高速伝送技術

    2001

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    Work type：Artistic work  

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  • マルチキャリアＴＤＭＡパケット伝送技術

    2000

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Awards

  • 電子情報通信学会 業績賞

    2009  

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    Country：Japan

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  • 2009 IEICE Communications Society Best Paper Award

    2009  

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  • 2009 European Microwave Week (EuMW), European Wireless Technology (EuWiT) Conference, Best Paper Award

    2009  

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  • 2009 European Microwave Week (EuMW), European Wireless Technology (EuWiT) Conference, Best Paper Award

    2009  

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  • 2009 IEICE Communications Society Best Paper Award

    2009  

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    Country：Japan

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  • 2007 IEICE Communications Society Best Paper Award

    2007  

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    Country：Japan

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  • 2007 IEICE Communications Society Best Paper Award

    2007  

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  • 電子情報通信学会 論文賞

    1995  

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    Country：Japan

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  • 電子情報通信学会 篠原記念学術奨励賞

    1994  

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    Country：Japan

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Research Projects

  • High bit rate packet transmission techniques for mobile radio communications

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    Grant type：Competitive

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  • 移動通信における最尤検波器

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    Grant type：Competitive

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  • 移動通信における時空間信号処理

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    Grant type：Competitive

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  • 移動通信における高速パケット伝送技術

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    Grant type：Competitive

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  • Maximum likelihood detector for mobile radio communications

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    Grant type：Competitive

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  • Space-time signal processing for mobile radio communications

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    Grant type：Competitive

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