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2007 Fiscal Year Final Research Report Summary

Research on technology of mitigating channel collision in optical code division multiple access

Research Project

Project/Area Number 18560384
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Communication/Network engineering
Research InstitutionKeio University

Principal Investigator

SASASE Iwao  Keio University, Science and Technology, Professor (00187139)

Project Period (FY) 2006 – 2007
KeywordsOptical Code Division Multiple Access / Multiple Access Interference / TTFR / Spectral-Slice / Time-Encoding / Multi-rate
Research Abstract

1. We propose spectral phase-encoded optical atmospheric (OA) code-division multiple-access (CDMA) systems with pulse-position modulation (PPM) and theoretically analyze the bit error rates (BERs). We compare the BERs of the proposed system to those of time-encoded OA-PPM-CDMA systems at the same bit rate and chip rate. We show that, even if the proposed spectral phase-encoded OA-PPM-CDMA system is equipped with no mitigation techniques of multiple access interference (MAI) and scintillation, the proposed system achieves lower BERs than both time-encoded OA-PPM-CDMA systems, both with and without a mitigation technique of MAI/scintillation, due to its higher code spreading gain and higher tolerance to noise.
2. We propose a multi-rate SPECTS-O-CDMA system using OVSF code sequences. The proposed multi-rate system achieves a distinct differentiation on bit-rate/BER requirements and improves the BER performances of higher-rate users compared to the conventional single-rate system.
3. In the MWML (Multiweight-Multilength)-OOC (Optical Orthogonal Code) Optical code division multiple access (CDMA), the differentiation of the transmission rate and QoS (Quality of Service) can be realized by changing the code-length and number of weights according to user requirement. However, mitigation of MAI (Multi Access Interference) is not done in the conventional MWML-OOC Optical CDMA. In this paper, we apply SOC (Super-Orthogonal Code) which can correct the error without addition of redundancy bit and an increase in number of weight for MWML-OOC Optical CDMA to mitigate MAI. Since our scheme can reduce the number of optical pulses, the proposed scheme can mitigate the effect of MAI compared with the conventional scheme. We show that the proposed scheme can improve the BER performance in comparison with the conventional scheme.

  • Research Products

    (13 results)

All 2008 2007 Other

All Journal Article (8 results) (of which Peer Reviewed: 4 results) Presentation (4 results) Remarks (1 results)

  • [Journal Article] A Mitigation Technique of High-Power MAI in the Multimedia Optical CDMA System with the Optical Power Selector2008

    • Author(s)
      Kohki Ohba, Takaya Miyazawa and Iwao Sasase
    • Journal Title

      IEICE TRANSACTIONS on Communications Volume E91-B

      Pages: 700-709

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Mitigation Techniques of Channel Collisions in the TTFR-based Asynchronous Spectral Phase-Encoded Optical CDMA System2008

    • Author(s)
      Takaya Miyazawa and Iwao Sasase
    • Journal Title

      Journal of Communications and Networks

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] A Mitigation Technique of High-Power MAI in the Multimedia Optical CDMA System with the Optical Power Selector2008

    • Author(s)
      Kohki, Ohba
    • Journal Title

      IEICE TRANSACTIONS on Communications Volume E91-B

      Pages: 700-709

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Mitigation Techniques of Channel Collisions in the TTFR-based Asynchronous Spectral Phase-Encoded Optical CDMA System2008

    • Author(s)
      Takaya, Miyazawa
    • Journal Title

      Journal of Communications and Networks Volume 10, No. 1

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] BER Performance Analysis of Spectral Phase-Encoded Optical Atmospheric PPM-CDMA Communication Systems2007

    • Author(s)
      Takaya Miyazawa and Iwao Sasase
    • Journal Title

      IEEE Journal of Lightwave Technology Volume25

      Pages: 2992-3000

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Multi-Rate Spectral Phase-Encoded Timespreading O-CDMA System Using Orthogonal Variable Spreading Factor Code Sequences2007

    • Author(s)
      Takaya Miyazawa and Iwao Sasase
    • Journal Title

      IEEE Photonics Technology Letters Volume19

      Pages: 1502-1504

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] BER Performance Analysis of Spectral Phase-Encoded Optical Atmospheric PPM-CDMA Communication Systems2007

    • Author(s)
      Takaya, Miyazawa
    • Journal Title

      IEEE Journal of Lightwave Technology Volume Volume 25

      Pages: 2992-3000

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Multi-Rate Spectral Phase-Encoded Timespreading O-CDMA System Using Orthogonal Variable Spreading Factor Code Sequences2007

    • Author(s)
      Takaya, Miyazawa
    • Journal Title

      IEEE Photonics Technology Letters, Volume Volume 19

      Pages: 1502-1504

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] MWML-OOC Multimedia Optical CDMA Using SOC2008

    • Author(s)
      Toshihide, Tsukahara
    • Organizer
      Technical Report of IEICE
    • Place of Presentation
      Osaka Electro- Communication University
    • Year and Date
      20080100
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] SOCを適用したMWML-OOC-マルチメディア光CDMA方式2008

    • Author(s)
      塚原 俊英
    • Organizer
      電子情報通信学会フォトニックネットワーク研究会
    • Place of Presentation
      大阪電気通信大学
    • Year and Date
      2008-01-28
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] A Mitigation Technique of High-Power MAI in the Multimedia Optical CDMA System with the Optical Power Selector2007

    • Author(s)
      Kohki Ohba
    • Organizer
      IEEE Global Telecommunications Conference 2007
    • Place of Presentation
      Washington D.C.,USA
    • Year and Date
      2007-11-30
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] A Mitigation Technique of High-Power MAI in the Multimedia Optical CDMA System with the Optical Power Selector2007

    • Author(s)
      Kohki, Ohba
    • Organizer
      IEEE Global Telecommunications Conference 2007
    • Place of Presentation
      Washington D. C., USA
    • Year and Date
      2007-11-30
    • Description
      「研究成果報告書概要(欧文)」より
  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://www://sasase.ics.keio.ac.jp

URL: 

Published: 2010-02-04  

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