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检索条件"主题词=Optical ZCZ code"

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Indoor Experiment of BER Performance of optical CDMA System Using optical zcz code

Indoor Experiment of BER Performance of Optical CDMA System ...

引用

12th International Conference on Advanced Communication Technology (ICACT) - lCT for Green Growth and Sustainable Development

作者： Matsumoto, Takahiro Suwaki, Yu Matsufuji, Shinya Yamaguchi Univ Grad Sch Sci & Engn 2-16-1 Tokiwadai Ube Yamaguchi 7558611 Japan

ISBN: (纸本)9788955191455

The optical zcz code, which is a set of pairs of binary and bi-phase sequences with zero correlation zone, can provide optical code division multiple access (COMA) communication system without co-channel interference. We proposed the compact construction of a code generator and a bank of matched filters for this code. In this paper, we verified that this system can suppress co-channel interference and interference by shifting of optical axis by data multiplex transmission experiment of optical COMA system using optical zcz codes which is called zcz-COMA system, consisting of a infrared light emitting diode(LEO), an avalanche photo diode(APO) module and field programmable gate array(FPGA) boards corresponding to 400,000 logic gates. As a result of data transmission experiment, optical zczCOMA system can suppress co-channel interference, but can't remove completely co-channel interference, and interference by shifting of optical axis is suppressed from about -30 to 30 degrees.

关键词： optical zcz code optical wireless communication COMA system Shifting of optical axis

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BER Performance of M-ary/ASK-SS System Using Compact Matched Filter Bank for optical zcz code

BER Performance of M-ary/ASK-SS System Using Compact Matched...

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12th International Conference on Advanced Communication Technology (ICACT) - lCT for Green Growth and Sustainable Development

作者： Matsumoto, Takahiro Matsufuji, Shinya Yamaguchi Univ Grad Sch Sci & Engn 2-16-1 Tokiwadai Ube Yamaguchi 7558611 Japan

ISBN: (纸本)9788955191455

The optical zcz code, which is a set of pairs of binary and bi-phase sequences with zero correlation zone, can provide code division multiple access (CDMA) communication system without co-channel interference. And M-ary amplitude shift keying spread spectrum (M-ary/ASK-SS) system using this code can detect a desired sequence without interference of undesired sequences. We proposed the compact construction of a bank of matched filters for this code, which is called tree-type bank of matched filters. However, M-ary/ASK-SS system using this filters might go down the bit error rate (BER) performance because input-output characteristics of this filters for zero correlation zone 4n-2 is nonlinear characteristics. In this paper, we clarify that BER performance in ASK-SS and M-ary/ASK-SS system under the additive white Gaussian noise (AWGN) and the frequency nonselective fading environments are not influenced by nonlinear characteristics of this filters by the computer simulation. The BER performance of ASK-SS system using tree-type bank of matched filters under the AWGN and frequency nonselective fading environments go down compared to BER performance of parallel-type filters as expected. But the BER performance of M-ary/ASK-SS system using this compact filters under the AWGN and frequency nonselective fading environment are almost equal compared to BER performance of parallel-type filters. In fact, the BER performance in M-ary/ASK-SS are not influenced by nonlinear characteristics of tree-type bank of matched filters.

关键词： optical zcz code ASK-SS system M-ary/ASK-SS system matched filter bank

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The bank of matched filters for an optical zcz code using a sylvester type hadamard matrix

The bank of matched filters for an optical ZCZ code using a ...

引用

2nd International Workshop on Sequence Design and Its Applications in Communications

作者： Matsumoto, Takahiro Tsukiashi, Shigeo Matsufuji, Shinya Tanada, Yoshihiro Yamaguchi Univ Grad Sch Sci & Engn Ube Yamaguchi 7558611 Japan

The optical zcz code is a set of pairs of binary and biphase sequences with zero correlation zone. An optical M-ary direct sequence spread spectrum (M-ary/DS-SS) system using this code can detect a desired sequence without interference of undesired sequences. However, the bank of matched filters in a receiver circuit may fall into large scale. In this paper, we propose the compact construction of a bank of matched filters for an M-ary/DS-SS system using an optical zcz code. This filter bank can decrease the number of 2-input adders from O(N-2) to O(N) and delay circuits from O(N-2) to O(N log(2) N), respectively, and is implemented on a field programmable gate array (FPGA) corresponding to 400, 000 logic gates.

关键词： optical communication optical zcz code M-aryl/DS-SS system matched filter bank field programmable gate array

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code generator implementation on FPGA for an optical zcz code using a Sylvester type Hadamard matrix

Code generator implementation on FPGA for an optical ZCZ cod...

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3rd International Workshop on Signal Design and Its Applications in Communications (IWSDA 07)

作者： Matsumoto, Takahiro Matsufuji, Shinya Yamaguchi Univ Grad Sch Sci & Engn Ube Yamaguchi 7558611 Japan

ISBN: (纸本)9781424410736

The optical zcz code is a set of pairs of binary and bi-phase sequences with zero correlation zone. An optical code division multiple access (CDMA) system using this code can remove co-channel interference and influence of multi-path. We proposed the compact construction of a bank of matched filters for this code in a receiver. But we have not proposed the construction of a code generator for this code in a transmitter yet. In this paper, we propose the construction of two code generators for an optical zcz code using a Sylvester-type Hadamard matrix, which are called ROM-type and non ROM-type code generators. This ROM-type code generator can be constructed by a ROM and a up-counter. Similarly, this non ROM-type code generator can be constructed by a up-counter, flip-flops and logic gates. The ROM-type and non ROM-type code generators are implemented on a field programmable gate array (FPGA) corresponding to 400, 000 logic gates, and the non ROM-type code generator can reduce logic elements than the ROM-type code generator.

关键词： optical communication optical zcz code optical CDMA system code generator field programmable gate array

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code Generator Implementation on FPGA for an optical zcz code Using a Sylvester Type Hadamard Matrix

Code Generator Implementation on FPGA for an Optical ZCZ Cod...

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第三届信号设计及其在通信中的应用国际会议(Proceedings of 2007 International Workshop on Signal Design and Its Applications in Communications IWSDA'07)

作者： Takahiro MATSUMOTO Shinya MATSUFUJI Graduate School of Science and Engineering Yamaguchi University2-16-1 Tokiwadai Ube 755-8611 Japan

The optical zcz code is a set of pairs of binary and bi-phase sequences with zero correlation zone. An optical code division multiple access (CDMA) system using this code can remove co-channel interference and influence of multi-path. We proposed the compact construction of a bank of matched filters for this code in a receiver. But we have not proposed the construction of a code generator for this code in a transmitter yet. In this paper, we propose the construction of two code generators for an optical zcz code using a Sylvester-type Hadamard matrix, which are called ROM-type and non ROM- type code generators. This ROM-type code generator can be constructed by a ROM and a up-counter. Similarly,this non ROM-type code generator can be constructed by a up-counter, flip-flops and logic gates. The ROM-type and non ROM-type code generators are implemented on a field programmable gate array (FPGA) corresponding to 400,000 logic gates, and the non ROM-type code generator can reduce logic elements than the ROM-type code generator.

关键词： optical communication optical zcz code optical CDMA system code generator Field programmable gate array

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On optical zcz codes With a Good Aperiodic Autocorrelation Property

On Optical ZCZ Codes With a Good Aperiodic Autocorrelation P...

引用

15th International Conference on Advanced Communications Technology (ICACT)

作者： Abudoukeremu, Ainiwan Matsufuji, Shinya Matsumoto, Takahiro Yamaguchi Univ Grad Sch Sci & Engn Yamaguchi Japan

ISBN: (纸本)9788996865018;9781467331487

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.

关键词： sequence design optical zcz code E-sequence optical communication

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On optical zcz codes With a Good Aperiodic Autocorrelation Property

On Optical ZCZ Codes With a Good Aperiodic Autocorrelation P...

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International Conference on Advanced Communication Technology

作者： Ainiwan Abudoukeremu Shinya Matsufuji Takahiro Matsumoto Graduate School of Science and Engineering Yamaguchi University

ISBN: (纸本)9781467331487

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.

关键词： Sequence design optical zcz code E-sequence optical communication

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