Faculty Profiles - MATSUMOTO Takahiro

Papers - MATSUMOTO Takahiro

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Yuta Ida, Masanori Yofune, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji . Non-linear Fast Fading Compensation for HTRCI-MIMO/OFDM with QRM-MLD and Channel Ranking . SIXTH INTERNATIONAL WORKSHOP ON SIGNAL DESIGN AND ITS APPLICATIONS IN COMMUNICATIONS 130 - 133 2013.10Non-linear Fast Fading Compensation for HTRCI-MIMO/OFDM with QRM-MLD and Channel RankingReviewed

Publisher：IEEE

In multiple-input multiple-output orthogonal frequency division multiplexing (MIMO/OFDM) systems, large complexity is considerable work. To mitigate this problem, high time resolution carrier interferometry (HTRCI) for MIMO/OFDM applying QR decomposition with M algorithm maximum likelihood detection (QRM-MLD) and channel ranking has been proposed. In the fast fading environment, since many errors are occurred in the last part of the packet, the decision direct method has been proposed. However, it requires also large complexity. Therefore, in this paper, we propose the non-linear prediction method for a HTRCI-MIMO/OFDM with QRM-MLD and channel ranking.

DOI： 10.1109/IWSDA.2013.6849080

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Takahiro Matsumoto, Takashi Sugimoto, Hideyuki Torii, Yuta Ida, Shinya Matsufuji . Theoretical Analysis of BER Performance of Spread Spectrum System Using a Huffman Sequence Over AWGN Channels . Proc. of the 2013 International Workshop on Smart Info-Media Systems in Asia (SISA2013) 27 - 31 2013.9Theoretical Analysis of BER Performance of Spread Spectrum System Using a Huffman Sequence Over AWGN ChannelsReviewed

Hideyuki TORII, Masaaki SATOH, Takahiro MATSUMOTO, Makoto NAKAMURA . Quasi-Optimal and Optimal Generalized Mutually Orthogonal ZCZ Sequence Sets Based on an Interleaving Technique . International Journal of Communications1 ( 7 ) 18 - 25 2013.5Quasi-Optimal and Optimal Generalized Mutually Orthogonal ZCZ Sequence Sets Based on an Interleaving TechniqueReviewed

Takahiro MATSUMOTO, Hideyuki TORII, Shinya MATSUFUJI . Theoretical Analysis of BER Performance of Optical ZCZ-CDMA System . International Journal of Computers and Communications1 ( 7 ) 18 - 25 2013.5Theoretical Analysis of BER Performance of Optical ZCZ-CDMA SystemReviewed

Yuta Ida, Chang-Jun Ahn, Takahiro Matsumoto, Shinya Matsufuji . Mitigated deep faded channel with relay node allocation for MUDiv/OFDMA . 2013 19th Asia-Pacific Conference on Communications, APCC 2013 6 - 11 2013.4Mitigated deep faded channel with relay node allocation for MUDiv/OFDMAReviewed

Publisher：IEEE Computer Society

In recent, to achieve several services with the information product, high speed and high quality systems of wireless communications are demanded. To achieve this demand, orthogonal frequency division multiple access (OFDMA) has been proposed. In a wireless network, the transmitted signal of each user has independent channel fluctuation characteristics. By using this characteristic, the multiuser diversity (MUDiv) effect can be obtained, and MUDiv/OFDMA has been proposed. Before now, we have proposed a low complexity MUDiv/OFDMA. However, it degrades the system performance compared with the conventional MUDiv/OFDMA in the channel as a Pyramid model. To solve this problem, in this paper, we propose the method to mitigate the deep faded channel for a low complexity MUDiv/OFDMA with the relay node allocation. © 2013 IEEE.

DOI： 10.1109/APCC.2013.6765906

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Hideyuki Torii, Masaaki Satoh, Takahiro Matsumoto, Makoto Nakamura . Generalized Mutually Orthogonal ZCZ Sequence Sets Based on Perfect Sequences and Orthogonal Codes . Proc. of the 15th International Conference on Advanced Communication Technology (ICACT2013) 894 - 899 2013.1Generalized Mutually Orthogonal ZCZ Sequence Sets Based on Perfect Sequences and Orthogonal CodesReviewed

Publisher：IEEE

The present paper proposes a new method for constructing mutually orthogonal zero-correlation zone (MO-ZCZ) sequence sets using perfect sequences, orthogonal codes, and an interleaving technique. Generally, an MO-ZCZ sequence set is composed of several ZCZ sequence sets, and two arbitrary sequences that belong to different ZCZ sequence sets have orthogonality. Each ZCZ sequence set included in the proposed MO-ZCZ sequence set is a quasi-optimal ZCZ sequence set. In addition, two arbitrary sequences that belong to different ZCZ sequence sets have not only orthogonality but also a zero-correlation zone of which the ZCZ length satisfies quasi-optimality. Consequently, the proposed MO-ZCZ sequence set can be regarded as a single quasi-optimal ZCZ sequence set. In this sense, the proposed MO-ZCZ sequence set can be regarded as a generalized version of conventional MO-ZCZ sequence sets.

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Ainiwan Abudoukeremu, Shinya Matsufuji, Takahiro Matsumoto . On Optical ZCZ Codes With a Good Aperiodic Autocorrelation Property . Proc. of the 15th International Conference on Advanced Communication Technology (ICACT2013) 586 - 589 2013.1On Optical ZCZ Codes With a Good Aperiodic Autocorrelation PropertyReviewed

Publisher：IEEE

A quasi-synchronous optical code division multiple access (OCDMA) system, which uses a set of pairs of binary and bi-phase sequences with a zero correlation zone (Zcz) called an optical ZCZ (O-ZCZ) code as a spreading code, can efficiently mitigate multiple access interferences (MAI). This paper presents O-ZCZ codes of length 2(n+1) with the minimum zero correlation zone Zcz=1, which possess a low aperiodic autocorrelation property. They are derived from complementary sequence pairs of length 2(n) that the sum of these aperiodic autocorrelation functions take zero except zero-shift.

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Takahiro MATSUMOTO, Takahiro NISHIKAWA, Hideyuki TORII, Shinya MATSUFUJI . Matched Filter Bank Implementation on FPGA for a Mutually Orthogonal Set of ZCZ Codes Using Hadamard and ZCZ Codes . Proc. of the 15th International Conference on Advanced Communication Technology (ICACT2013) 764 - 767 2013.1Matched Filter Bank Implementation on FPGA for a Mutually Orthogonal Set of ZCZ Codes Using Hadamard and ZCZ CodesReviewed

Hideyuki TORII, Masaaki SATOH, Takahiro MATSUMOTO, Makoto NAKAMURA . New Generalized Mutually Orthogonal ZCZ Sequence Sets Constructed from DFT Matrices . Proc. of the 3rd European Conference of Communications (ECCOM'12) 262 - 267 2012.12New Generalized Mutually Orthogonal ZCZ Sequence Sets Constructed from DFT MatricesReviewed

Takahiro MATSUMOTO, Hideyuki TORII, Shinya MATSUFUJI . Comparison of Optical ZCZ-CDMA System with Zero Correlation Zone 4n ? 2 by Electrical and Optical Processing . Proc. of the 3rd European Conference of Communications (ECCOM'12) 268 - 273 2012.12Comparison of Optical ZCZ-CDMA System with Zero Correlation Zone 4n ? 2 by Electrical and Optical ProcessingReviewed

Jincheng Huang, Shinya Matsufuji, Takahiro Matsumoto, Noriyoshi Kuroyanagi . A ZCZ-CDMA system with BFSK modulation . INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS25 ( 12 ) 1620 - 1638 2012.12A ZCZ-CDMA system with BFSK modulationReviewed

Publisher：WILEY-BLACKWELL

A quasi-timing synchronous code division multiple access (CDMA) system called ZCZ-CDMA, which uses a set of sequences with a zero-correlation zone called ZCZ code as a spreading code, is useful for short-range wireless communications because of its excellent properties such as co-channel interference-free performance, simplified hardware design, and low transmit power as well as fast frame synchronization capability. In this paper, a ZCZ-CDMA system with binary frequency-shift keying (BFSK) modulation called BFSK-ZCZ-CDMA is proposed. This system is characterized by using a pair of balanced ZCZ codes for spreading and transmitting the two spread components over the respective keying carrier frequencies. Its bit error rate performance, compared with those of existing BPSK-ZCZ-CDMA, ASK-ZCZ-CDMA, and CDMA systems using the other spreading codes, is evaluated in theory and simulation. The bit error rate performance of the three ZCZ-CDMA systems over additive white Gaussian noise and Rayleigh fading channels are formulated. It is proved that BFSK-ZCZ-CDMA is much more robust in anti-fading performance and low transmit power in such an environment that fading distributions on the keying frequencies are independent mutually. Fading versus frequency characteristics are also investigated. Copyright (c) 2012 John Wiley & Sons, Ltd.

DOI： 10.1002/dac.2313

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Tomohiro HAYASHIDA, Shinya MATSUFUJI, Takahiro MATSUMOTO, Pingzhi FAN . Construction of ZCZ Codes With Low Aperiodic Autocorrelation . Journal of Signal Processing16 ( 6 ) 477 - 485 2012.11Reviewed

Kosuke Omata, Hideyuki Torii, Takahiro Matsumoto . Zero-Cross-Correlation Properties of Asymmetric ZCZ Sequence Sets . IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCESE95A ( 11 ) 1926 - 1930 2012.11Zero-Cross-Correlation Properties of Asymmetric ZCZ Sequence SetsReviewed

Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

Recently, asymmetric zero-correlation zone (A-ZCZ) sequence sets that are composed of several sequence subsets have been proposed. In A-ZCZ sequence sets, the zero-cross-con-elation zone (ZCCZ) length between different sequence subsets is larger than the zero-correlation zone (ZCZ) length in each sequence subset. However, the ZCCZ length between different sequence subsets was not precisely shown in previous studies. The present letter shows precisely the ZCCZ length between different sequence subsets. This information is useful for estimating the magnitude of inter-cell interference when designing approximately synchronized code-division multiple-access (AS-CDMA) systems.

DOI： 10.1587/transfun.E95.A.1926

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Takahiro Matsumoto, Hideyuki Torii, Shinya Matsufuji . Theoretical Analysis of BER Performance of Optical ZCZ-CDMA System With Smallest Zero Correlation Zone Using Optical Correlator . IEEE INTERNATIONAL SYMPOSIUM ON INTELLIGENT SIGNAL PROCESSING AND COMMUNICATIONS SYSTEMS (ISPACS 2012) 549 - 552 2012.11Theoretical Analysis of BER Performance of Optical ZCZ-CDMA System With Smallest Zero Correlation Zone Using Optical CorrelatorReviewed

Publisher：IEEE

In this paper, we analyze the bit error rate (BER) performance of optical code division multiple access (CDMA) system based on the optical zero-correlation zone (ZCZ) code using the optical correlator which is called optical ZCZ-CDMA system, over the optical fiber and space by theoretical formula. In the optical fiber transmission of this system, the effect of the avalanche photodiode (APD) noise, thermal noise and co-channel interference are considered. Additionally, the effects of the scintillation and background noise are considered in the optical space transmission of this system. The optical ZCZ code, which is a set of pairs of a binary sequence consisting of 1 or 0 and a biphase sequence consisting of 1 or -1 with zero-correlation zone, may be able to provide optical CDMA communication system suppressed co-channel interference. As a result, the BER performance of optical ZCZ-CDMA system over the optical space go down compared to that over the optical fiber, and this system can't remove completely co-channel interference.

DOI： 10.1109/ISPACS.2012.6473550

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Hideyuki TORII, Takahiro MATSUMOTO, Makoto NAKAMURA . Optimal Polyphase Asymmetric ZCZ Sequence Sets Including Uncorrelated Sequences . Journal of Signal Processing16 ( 6 ) 487 - 494 2012.11Reviewed

Shinya Matsufuji, Takahiro Matsumoto, Pingzhi Fan . Even-Shift Orthogonal Arrays . IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCESE95A ( 11 ) 1937 - 1940 2012.11Reviewed

Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

The even-shift orthogonal sequence whose out-of-phase aperiodic autocorrelation function takes zero at any even shifts is generalized to multi-dimension called even-shift orthogonal array (E-array), and the logic function of E-array of power-of-two length is clarified. It is shown that E-array can be constructed by complementary arrays, which mean pairs of arrays that the sum of each aperiodic autocorrelation function at the same phase shifts takes zero at any shift except zero shift, as well as the one-dimensional case. It is also shown that the number of mates of E-array with which the cross correlation function between E-arrays takes zero at any even shifts is equal to the dimension. Furthermore it is investigated that E-array possesses good aperiodic autocorrelation that the rate of zero correlation values to array length approaches one as the dimension becomes large.

DOI： 10.1587/transfun.E95.A.1937

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Yoshihiko Ichikawa, Kahori Ogashiwa, Motoyuki Suzuki, Takahiro Matsumoto, Hiroo Naitoh . An Overview of YUSE Yamaguchi University Self-Evaluation System in Relation to University Self-Evaluation Activities in the First Mid-Term Goals Period and the First Half of the Second Period . Journal for Academic Computing and Networking16 3 - 14 2012.9Reviewed

Hideyuki Torii, Takahiro Matsumoto, Makoto Nakamura . A New Method for Constructing Asymmetric ZCZ Sequence Sets . IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCESE95A ( 9 ) 1577 - 1586 2012.9A New Method for Constructing Asymmetric ZCZ Sequence SetsReviewed

Publisher：IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG

The present paper proposes a new method for constructing polyphase asymmetric zero-correlation zone (A-ZCZ) sequence sets. The proposed method can generate A-ZCZ sequence sets that cannot be obtained from methods proposed by other researchers and is a generalized version of our previously proposed method. An A-ZCZ sequence set can be regarded as a ZCZ sequence set. The newly obtained A-ZCZ sequence sets include quasi-optimal ZCZ sequence sets of which the zero-cross-correlation zone (ZCCZ) length between different sequence subsets is larger than the mathematical upper bound of conventional ZCZ sequence sets. A new method for extending the A-ZCZ sequence sets is also presented in the present paper.

DOI： 10.1587/transfun.E95.A.1577

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Hideyuki TORII, Takahiro MATSUMOTO, Makoto, NAKAMURA . New Asymmetric ZCZ Sequence Sets Based on DFT Matrices . Proc. of the 2012 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'12) 792 - 795 2012.3New Asymmetric ZCZ Sequence Sets Based on DFT MatricesReviewed

Takahiro MATSUMOTO, Mika, INOUE, Hideyuki TORII, Shinya MATSUFUJI . Study on BER Performance of Atmospheric Optical CDMA System Using Optical ZCZ Code . Proc. of the 2012 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'12) 210 - 213 2012.3Study on BER Performance of Atmospheric Optical CDMA System Using Optical ZCZ CodeReviewed

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Papers - MATSUMOTO Takahiro