Faculty Profiles - MATSUMOTO Takahiro

Papers - MATSUMOTO Takahiro

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Yoshihiro TANADA, Takahiro MATSUMOTO . Fast Aperiodic Correlation Algorithm for Real-Valued Shift-Orthogonal Finite-Length Sequence of Length 2^ν+1 . IEICE Trans. FundamentalsVol.J89-A ( 6 ) 502 - 513 2006.6Fast Aperiodic Correlation Algorithm for Real-Valued Shift-Orthogonal Finite-Length Sequence of Length 2^ν+1Reviewed

Takahiro MATSUMOTO, Yoshihiro TANADA . A Real-Valued Periodic Orthogonal Sequence Derived from a Real-Valued Shift-Orthogonal Finite-Length Sequence and Its Fast Periodic Correlation Algorithm . IEICE Trans. FundamentalsJ89-A ( 5 ) 323 - 332 2006.5A Real-Valued Periodic Orthogonal Sequence Derived from a Real-Valued Shift-Orthogonal Finite-Length Sequence and Its Fast Periodic Correlation AlgorithmReviewed

Takahiro MATSUMOTO, Shigeo TSUKIASHI, Shinya MATSUFUJI, Yoshihiro TANADA . A Design of a Digital Matched Filter Bank for an Optical ZCZ Code Using a Sylvester Type Hadamard Matrix . Proc. of the Second International Workshop on Sequence Design and Its Applications in Communications (IWSDA'05) 184 - 188 2005.10A Design of a Digital Matched Filter Bank for an Optical ZCZ Code Using a Sylvester Type Hadamard MatrixReviewed

Shinya MATSUFUJI, Takahiro MATSUMOTO, Yoshihiro TANADA, Noriyoshi KUROYANAGI . Extended ZCZ Codes for ASK-CDMA system . Proc. of the Second International Workshop on Sequence Design and Its Applications in Communications (IWSDA'05) 90 - 93 2005.10Extended ZCZ Codes for ASK-CDMA systemReviewed

Takahiro MATSUMOTO, Yoshihiro TANADA . Aperiodic autocorrelation functions of real-valued shift-orthogonal finite-length sequences with round-off errors . Electronics and Communications in Japan，Part 387 ( 6 ) 1 - 12 2004.6Aperiodic autocorrelation functions of real-valued shift-orthogonal finite-length sequences with round-off errorsReviewed

Language：English Publishing type：Research paper (scientific journal) Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS

A real-valued shift-orthogonal finite-length sequence is a sequence for which the side-lobe of the aperiodic autocorrelation function is zero except at the two ends. It is effectively used in spread-spectrum communications and other applications. This type of sequence can be synthesized by using element sequences of adequate lengths. Consequently, fast correlation processing can be realized by dividing the process for each element sequence. A problem in this sequence is that the round-off error of its real values has an effect on the correlation characteristics. Therefore, this paper investigates the effect of the round-off error on integrated correlation processing and divided correlation processing. In the former, the mean-square error of the correlation output is inversely proportional to the sequence length. In the latter, it is the sum of the mean-square errors of the element sequences, which are inversely proportional to the respective sequence lengths. Thus, we see that the error of shorter element sequences should be reduced in the latter method in order to speed up correlation processing. This paper considers in particular a method by which the mean-square error is reduced without significantly enlarging the circuit scale. (C) 2004 Wiley Periodicals, Inc.

DOI： 10.1002/ecjc.10152

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Takahiro MATSUMOTO, Yoshihiro TANADA . Aperiodic Autocorrelation Functions of Real-Valued Shift-Orthogonal Finite-Length Sequences with Round-Off Errors . IEICE Trans. FundamentalsJ86-A ( 6 ) 674 - 683 2003.6Aperiodic Autocorrelation Functions of Real-Valued Shift-Orthogonal Finite-Length Sequences with Round-Off ErrorsReviewed

Takahiro MATSUMOTO, Yoshihiro TANADA . Implementation of Multiple Digital Matched Filter for Quasi-Synchronous CDMA without Cochannel Interference Using Real-Valued Shift-Orthogonal Finite-Length Sequences . Proc. of the 5th International Conference on Advanced Communication Technology (ICACT2003) 357 - 361 2003.1Implementation of Multiple Digital Matched Filter for Quasi-Synchronous CDMA without Cochannel Interference Using Real-Valued Shift-Orthogonal Finite-Length SequencesReviewed

Takahiro MATSUMOTO, Yoshihiro TANADA . Fast Correlation Algorithms for a Real-Valued Shift-Orthogonal Finite-Length Sequence . Proc. of 1st International Workshop on Sequence Design and Applications for CDMA Systems (IWSDA2001) 74 - 81 2001.9Fast Correlation Algorithms for a Real-Valued Shift-Orthogonal Finite-Length SequenceReviewed

Takahiro MATSUMOTO, Yoshihiro TANADA, Kiminori, SATO, Yoji NAGASAWA . A Trial of a Fast Digital Matched Filter for a Real-Valued Shift-Orthogonal Finite-Length Sequence . IEICE Trans. FundamentalsJ84-A ( 3 ) 374 - 386 2001.3A Trial of a Fast Digital Matched Filter for a Real-Valued Shift-Orthogonal Finite-Length SequenceReviewed

Takahiro MATSUMOTO, Yoshihiro TANADA, Takahiro WATANABE . Digital matched filter of reduced operation elements for M-ary/DS-SS system using real-valued shift-orthogonal finite-length sequences . Proc. of Third IEEE Signal Processing Workshop on Signal Processing Advances in Wireless Communications (SPAWC2001) 46 - 49 2001.3Digital matched filter of reduced operation elements for M-ary/DS-SS system using real-valued shift-orthogonal finite-length sequencesReviewed

Publisher：IEEE COMPUTER SOC

A real-valued shift-orthogonal finite-length sequence has a sharp autocorrelation function with zero sidelobes except at shift ends, and can be synthesized by element sequences. In this paper, we propose the structure of a digital matched Alter for Mary Direct Sequence Spread Spectrum (M-ary/DS-SS) system using the sequences and the reduction of operation elements of the digital matched Alter. It is shown that this digital matched Alter for M-ary/DS-SS system can be constructed by the multipliers and the adders proportional to sequence length.

DOI： 10.1109/SPAWC.2001.923839

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Yoshihiro TANADA, Takahiro MATSUMOTO . Real-Valued Convolutional PN Sequences and Their Application to Interference-Free Quasi-Synchronous CDMA . Proc. of 4th World Multiconference on Systemics, Cybernetics and Informatics (SCI2000)VII 129 - 134 2000.7Real-Valued Convolutional PN Sequences and Their Application to Interference-Free Quasi-Synchronous CDMAReviewed

Takahiro MATSUMOTO, Yoshihiro TANADA, Kiminori SATOH, Youji NAGASAWA . Digital Matched Filter Implementation on FPGA for a Shift-Orthogonal Finite-Length Sequence . Proc. of the 10th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'99) 721 - 725 1999.9Digital Matched Filter Implementation on FPGA for a Shift-Orthogonal Finite-Length SequenceReviewed

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