Faculty Profiles - MATSUMOTO Takahiro

Papers - MATSUMOTO Takahiro

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Ryosuke SHIMIZU, Koki NOMURA, Takahiro MATSUMOTO, Hideyuki TORII, Yuta IDA, Shinya MATSUFUJI . Research on Optical CDMA System Using Two-Dimensional Optical ZCZ Sequence Set . Proc. of the 2019 International Workshop on Smart Info-Media Systems in Asia (SISA2019) 109 - 114 2019.9Research on Optical CDMA System Using Two-Dimensional Optical ZCZ Sequence SetReviewed

Kahori OGASHIWA, Takahiro MATSUMOTO, Yue WANG, Joji KARIYA, Hiroo NAITOH . Evaluation of the Yamaguchi University Self-Assessment and Evaluation System and Its Improvement . International Journal of Institutional Research and Management3 ( 1 ) 1 - 14 2019.5Evaluation of the Yamaguchi University Self-Assessment and Evaluation System and Its ImprovementReviewed

Yuta IDA, Takahiro MATSUMOTO, Shinya MATSUFUJI . Compensation of Deteriorated CSI Allocation Due to Fast Fading and Feedback Delay Based on Turbo Decision Direct for MUDiv/OFDMA . IEICE Journal of Nonlinear Theory and Its Applications10 ( 1 ) 190 - 205 2019.4Compensation of Deteriorated CSI Allocation Due to Fast Fading and Feedback Delay Based on Turbo Decision Direct for MUDiv/OFDMAReviewed

Takahiro MATSUMOTO, Hideyuki TORII, Yuta IDA, Shinya MATSUFUJI . A Generation Method of a Two-Dimensional Optical ZCZ Sequence with the Smallest Zero- Correlation Zone . Proc. of the 2019 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2019) 172 - 175 2019.3A Generation Method of a Two-Dimensional Optical ZCZ Sequence with the Smallest Zero- Correlation ZoneReviewed

Sho KURODA, Takahiro MATSUMOTO, Yuta IDA, Shinya MATSUFUJI . Construction of Matched Filter Bank of Multiphase ZCZ Code Reaches Mathematical Upper Bound . Proc. of the 2019 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2019) 164 - 167 2019.3Construction of Matched Filter Bank of Multiphase ZCZ Code Reaches Mathematical Upper BoundReviewed

Hideyuki TORII, Takahiro MATSUMOTO . Comparison of Co-Channel Interference Power between A-ZCZ Sequence Sets and GMO-ZCZ Sequence Sets by Computer Simulation . Proc. of the 2019 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2019) 116 - 119 2019.3Comparison of Co-Channel Interference Power between A-ZCZ Sequence Sets and GMO-ZCZ Sequence Sets by Computer SimulationReviewed

Takahiro MATSUMOTO, Hideyuki TORII, Yuta IDA, Shinya MATSUFUJI . Modified Mutually ZCZ Set of Optical Orthogonal Sequences . IEICE Trans. FundamentalsE101-A ( 12 ) 2414 - 2418 2018.12Modified Mutually ZCZ Set of Optical Orthogonal SequencesReviewed

Yuta IDA, Takahiro MATSUMOTO, Shinya MATSUFUJI . Antenna Interleaved Allocation with FSS and Divided FFT Spreading for MIMO-OFDM . Proc. of the 2018 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2018) 372 - 377 2018.11Antenna Interleaved Allocation with FSS and Divided FFT Spreading for MIMO-OFDMReviewed

Shinya Matsufuji, Sho Kuroda, Yuta Ida, Takahiro Matsumoto . A study on matched filter banks of P-phase ZCZ codes . International Symposium on Wireless Personal Multimedia Communications, WPMC2017- 202 - 205 2018.2A study on matched filter banks of P-phase ZCZ codesReviewed

Publisher：IEEE Computer Society

A set of sequences with a zero correlation zone named as a ZCZ code can provide CDMA systems with interference free performance called ZCZ-CDMA. A ZCZ code with the slightly large zero correlation zone, in which family size reaches the mathematical upper bound, may be used to offer a CDMA system with high stability and transmission efficiency in inferior channel environment. This paper designs a matched filter bank (MFB) of p-phase ZCZ codes with the above properties, which can simultaneously take correlation between a received symbol sequence and every sequence in the ZCZ code, and can be designed by the minimum number of circuit elements. The MFB will provide a ZCZ-CDMA module which can construct a network system flexibly, since it can detect all data bits at the same time and can utilize them.

DOI： 10.1109/WPMC.2017.8301808

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Takahiro Matsumoto, Hideyuki Torii, Yuta Ida, Shinya Matsufuji . Theoretical analysis of BER performance of OCDMA system using compact matched filter bank for an optical ZCZ sequence set . International Symposium on Wireless Personal Multimedia Communications, WPMC2017- 315 - 319 2018.2Theoretical analysis of BER performance of OCDMA system using compact matched filter bank for an optical ZCZ sequence setReviewed

Publisher：IEEE Computer Society

The optical zero-correlation zone (ZCZ) sequence set is a set of pairs of binary and bi-phase sequences with a zero-correlation zone, and can provide optical code division multiple access (OCDMA) systems without cochannel interference. We have proposed the construction of a compact-type matched filter bank for this sequence set. However, the OCDMA system using this filter bank might have reduced bit error rate (BER) performance because the input-output characteristics of this filter bank for this sequence set with the zero-correlation zone 4z - 2, z = 1, 2, · · · are nonlinear. In this paper, we clarify that the BER performance of the OCDMA system using a compact-type matched filter bank is not influenced by the nonlinear characteristics of this filter bank, using the theoretical formula of BER characteristics and computer simulation.

DOI： 10.1109/WPMC.2017.8301830

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Yuta Ida, Takahiro Matsumoto, Shinya Matsufuji . Packet splitting and adaptive modulation based on CSI of time domain for decode-and-forward cooperative OFDM systems in different channel model . International Journal of Communication Systems31 ( 2 ) 1 - 17 2018.1Packet splitting and adaptive modulation based on CSI of time domain for decode-and-forward cooperative OFDM systems in different channel modelReviewed

Publisher：John Wiley and Sons Ltd

Cooperative communications obtain the transmission and channel diversity gains by using the relay node. However, since cooperative communications transmit the redundancy signal to obtain the transmission diversity gain, the transmission rate is degraded. Moreover, since cooperative communications add the interference in the relay node, the diversity gain is also degraded. The packet splitting has been proposed based on the channel state information of the time domain to obtain the good system performance without the redundancy signal. Moreover, the adaptive modulation has been proposed to improve the transmission rate. In this paper, we propose the combination method with the packet splitting and the adaptive modulation based on the channel state information of the time domain to improve the bit error rate and throughput performances for decode-and-forward cooperative orthogonal frequency division multiplexing systems in the different channel model. From the computer simulation results, we determine the optimum weight and threshold for the proposed method. Moreover, the proposed method shows the good bit error rate and throughput performances.

DOI： 10.1002/dac.3451

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Yasuaki Ohira, Takahiro Matsumoto, Hideyuki Torii, Yuta Ida, Shinya Matsufuji . A compact matched filter bank for an optical ZCZ sequence set with zero-correlation zone 2z . IEICE Transactions on Fundamentals of Electronics, Communications and Computer SciencesE101A ( 1 ) 195 - 198 2018.1A compact matched filter bank for an optical ZCZ sequence set with zero-correlation zone 2zReviewed

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

In this paper, we propose a new structure for a compact matched filter bank (MFB) for an optical zero-correlation zone (ZCZ) sequence set with Zcz = 2z . The proposed MFB can reduces operation elements such as 2-input adders and delay elements. The number of 2-input adders decrease from O(N2) to O(N log2 N), delay elements decrease from O(N2) to O(N). In addition, the proposed MFBs for the sequence of length 32, 64, 128 and 256 with Zcz = 2
4 and 8 are implemented on a field programmable gate array (FPGA). As a result, the numbers of logic elements (LEs) of the proposed MFBs for the sequences with Zcz = 2 of length 32, 64, 128 and 256 are suppressed to about 76.2%, 84.2%, 89.7% and 93.4% compared to that of the conventional MFBs, respectively.

DOI： 10.1587/transfun.E101.A.195

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Takahiro Matsumoto, Hideyuki Torii, Yuta Ida, Shinya Matsufuji . BER performance of ss system using a human sequence against CW jamming . IEICE Transactions on Fundamentals of Electronics, Communications and Computer SciencesE101A ( 1 ) 167 - 175 2018.1BER performance of ss system using a human sequence against CW jammingReviewed

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

In this paper, we theoretically analyse the influence of intersymbol interference (ISI) and continuous wave interference (CWI) on the bit error rate (BER) performance of the spread spectrum (SS) system using a real-valued Human sequence under the additive white Gaussian noise (AWGN) environment. The aperiodic correlation function of the Human sequence has zero sidelobes except the shift-end values at the left and right ends of shift. The system can give the unified communication and ranging system because the output of a matched filter (MF) is the ideal impulse by generating transmitted signal of the bit duration T = NTc, N = 2n, n = 1
2
from the sequence of length M = 2kN + 1, k = 0
1
, where Tc is the chip duration and N is the spreading factor. As a result, the BER performance of the system is improved with decrease in the absolute value of the shift-end value, and is not influenced by ISI if the shift-end value is almost zero-value. In addition, the BER performance of the system of the bit duration T = NTc with CWI is improved with increase in the sequence length M = 2kN + 1, and the system can decrease the influence of CWI.

DOI： 10.1587/transfun.E101.A.167

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Naoya MUROKAWA, Yuta IDA, Takahiro MATSUMOTO, Shinya MATSUFUJI . Iterative Equalization Based on Estimated Variance and Threshold for Massive MIMO with Spatial Modulation . Proc. of the 2017 International Symposium on Nonlinear Theory and Its Applications (NOLTA2017)B2L ( E2 ) 538 - 541 2017.12Iterative Equalization Based on Estimated Variance and Threshold for Massive MIMO with Spatial ModulationReviewed

Yuta IDA, Takahiro MATSUMOTO, Shinya MATSUFUJI . Compensation of Deteriorated CSI Allocation Based on Decision Direct and Turbo Equalization for MUDiv/OFDMA . Proc. of the 2017 International Symposium on Nonlinear Theory and Its Applications (NOLTA2017)A3L ( A5 ) 209 - 212 2017.12Compensation of Deteriorated CSI Allocation Based on Decision Direct and Turbo Equalization for MUDiv/OFDMAReviewed

Kahori Ogashiwa, Takahiro Matsumoto, Yue Wang, Joji Kariya, Hiroo Naitoh . Evaluation and Improvement of Yamaguchi University Self-Assessment and Evaluation System . Proceedings - 2017 6th IIAI International Congress on Advanced Applied Informatics, IIAI-AAI 2017 218 - 220 2017.11Evaluation and Improvement of Yamaguchi University Self-Assessment and Evaluation SystemReviewed

Publisher：Institute of Electrical and Electronics Engineers Inc.

University evaluation is mandated by the School Education Act and the National University Cooperation Act. Universities are currently required to conduct self-assessments and improvements as university organizations. Yamaguchi University introduced Yamaguchi University Self-Assessment and Evaluation System (YUSE) before the incorporation of national universities, and the system has been in operation and under improvements for over ten years. The present paper reports improvements that have been made to the current self-assessment and evaluation system based on user requests. These improvements will provide useful information for improving evaluation systems at other universities. Moreover, it is possible for such improvements to be categorized into three frameworks that relate the systemic issues improved: system usability, links to other systems, and visualization functions (graphs) for analyses.

DOI： 10.1109/IIAI-AAI.2017.134

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Zeming Dong, Shinya Matsufuji, Yuta Ida, Takahiro Matsumoto . A study on PAPR reduction in OFDM using complex hadamard matrices . 2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017 154 - 158 2017.11A study on PAPR reduction in OFDM using complex hadamard matricesReviewed

Publisher：Institute of Electrical and Electronics Engineers Inc.

In Orthogonal Frequency Division Multiplexing (OFDM) utilizing the fast Fourier transform (FFT) technique, a high Peak-to-Average-Power-Ratio (PAPR) appears at a transmitter and causes signal wave distortion due to the nonlinearity of the amplifier. Namely the system performance degrades and power consumption increases. In the proposed PAPR reduction techniques, there is an application of the discrete Fourier transform (DFT) which is not FFT, and the fast Hadamard transform (FHT) using a binary Hadamard matrix. This paper considers OFDM with FHT using a complex Hadamard matrix including a binary one applied to complex pseudo-random numbers. Their PAPR characteristic and Bit-Error-Rate (BER) performance are investigated in the view of the matrix order and the output phase-number, and the effectiveness of the complex Hadamard matrix is shown.

DOI： 10.1109/IWSDA.2017.8097076

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Yuta Ida, Takahiro Matsumoto, Shinya Matsufuji . Three hop AF relay transmissions for OFDM applying real and imaginary TFI pilot signals . 2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017 145 - 148 2017.11Three hop AF relay transmissions for OFDM applying real and imaginary TFI pilot signalsReviewed

Publisher：Institute of Electrical and Electronics Engineers Inc.

Multi-hop relay transmissions achieve high quality and vast area communications by using several relay nodes. For the relay method based on an amplify-and-forward (AF), channel estimation (CE) is only demanded in the destination node. In the single-hop AF relay transmission for orthogonal frequency division multiplexing (OFDM) systems, we have proposed the CE by using the pilot signal based on the time frequency interferometry (TFI). However, in the multi-hop AF relay transmission, the conventional TFI method degrades the system performance due to a null signal and the overlapped channel. To solve this problem, in this paper, we propose the CE based on the real and imaginary TFI pilot signals in the three hop AF relay transmission for OFDM systems.

DOI： 10.1109/IWSDA.2017.8097074

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Pingzhi Fan, Tetsuya Kojima, Takahiro Matsumoto, Hideyuki Torii, Xiaohu Tang, Udaya Parampalli . Preface . 2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017 2017.11PrefaceReviewed

Takahiro Matsumoto, Masanori Kurashita, Yasuaki Ohira, Hideyuki Torii, Yuta Ida, Shinya Matsufuji . Influence of ISI on synchronous OCDMA system using an optical ZCZ sequence set on a diffuse channel . 2017 8th International Workshop on Signal Design and Its Applications in Communications, IWSDA 2017 159 - 163 2017.11Influence of ISI on synchronous OCDMA system using an optical ZCZ sequence set on a diffuse channelReviewed

Publisher：Institute of Electrical and Electronics Engineers Inc.

In this paper, we analyze the bit error rate (BER) performance of synchronous optical code division multiple access (OCDMA) system using an optical zero-correlation zone (ZCZ) sequence set over diffuse link by computer simulation, and evaluate the influence of inter-symbol interference (ISI) on the system. The optical ZCZ sequence set is a set of pairs of binary and bi-phase sequences with zero-correlation zone. As a result, the ISI can suppress by extension of zero-correlation zone.

DOI： 10.1109/IWSDA.2017.8097077

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Papers - MATSUMOTO Takahiro