Optical CDMA using time varying code and long code

• Project/Area Number: 19560396
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Communication/Network engineering
• Research Institution: Tokyo University of Science
• Principal Investigator: HIROYUKI Yashima Tokyo University of Science, 工学部・第一部, 教授 (30230197)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 光CDMA / カオス / 光CDM

Research Abstract

In this research, we propose new optical codedivision-multiple-access (OCDMA) systems using the extended chaotic binary codes (ECBCs) obtained easily from the extended Bernoulli map. Unlike conventional sequence codes, the ECBCs are composed by the map for every information bit, which means that the sequence code varies bit by bit. Therefore, high security against eavesdropping is expected. Then, we derive the expression for theoretical BER versus the number of simultaneous users of the proposed system and verify that the proposed system is effective in OCDMA system through numerical results.

Research Products

• [Journal Article] Performance Enhancement of 2-D WH/TS OCDM Systems using a Heterodyne Detection Receiver and PPM Signaling (2007)
  • Author(s): Anh T. Pham and Hiroyuki Yashima
  • Journal Title: OSA's Journal of Optical Networking Vol.6,No.6 Pages: 789-800
  • Peer Reviewed
• [Presentation] OFDMAにおける変調方式・符号化率の選択方法に関する一考察 (2010)
  • Author(s): 川村健, 諸橋知雄, 阿佐正人, 八嶋弘幸
  • Organizer: 電子情報通信学会、無線通信研究会、信号処理研究会
  • Place of Presentation: 福岡
  • Year and Date: 2010-01-22
• [Presentation] OFDMAにおける変調方式・符号化率の選択方法に関する一考察 (2010)
  • Author(s): 川村健
  • Organizer: 電子情報通信学会 無線システム研究会、信号処理研究会
  • Place of Presentation: 福岡 九州大学
  • Year and Date: 2010-01-22
• [Presentation] Optical CDMA Systems Using Extended Chaotic Binary Codes (2010)
  • Author(s): Yutaka Mizuno, Hiroyuki Yashima
  • Organizer: 2010 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing
  • Place of Presentation: Hawaii, USA
• [Presentation] Selection Method of Modulation and Coding Scheme in OFDMA (2010)
  • Author(s): Takeshi Kawamura, Tomoo Morohashi, Masahito Asa, Hiroyuki Yashima
  • Organizer: 2010 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing
  • Place of Presentation: Hawaii, USA
• [Presentation] Optical CDMA Systems Using Extended Chaotic Binary Codes (2010)
  • Author(s): Yutaka Mizuno
  • Organizer: 2010 RISP International Workshop on Non-linear Circuits, Communications and Signal Processing
  • Place of Presentation: Honolulu, USA
• [Presentation] Selection Method of Modulation and Coding Scheme in OFDMA (2010)
  • Author(s): 川村健
  • Organizer: 2010 RISP International Workshop on Non-linear Circuits, Communications and Signal Processing
  • Place of Presentation: Honolulu, USA
• [Presentation] Optimization of Adaptive Modulation on Subchannels of OFDMA in WiMAX (2009)
  • Author(s): Hiroaki Ando, Tomo-O Morohashi, Masahito Asa, Hiroyuki Yashima
  • Organizer: NCSP'09
  • Place of Presentation: 米国、ホノルル(CD-ROM)
  • Year and Date: 2009-03-03
• [Presentation] Combined One-Hop and Multi-Hop Transmission on Wireless Sensor Networks (2009)
  • Author(s): Toshiaki Ishikawa, Hiroyuki Yashima
  • Organizer: NCSP'O9
  • Place of Presentation: 米国、ホノルル(CD-ROM)
  • Year and Date: 2009-03-01
• [Presentation] Combined One-hop and Multi-hop Transmission on Wireless Sensor Networks (2009)
  • Author(s): Toshiaki Ishikawa, Hiroyuki Yashima
  • Organizer: 2009 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing
  • Place of Presentation: Hawaii, USA
• [Presentation] Low-Density Parity-Check Codes for Free Space Optical Communications During Rainfall (2008)
  • Author(s): Ryotaro Mitsuya, Hiroyuki Yashima
  • Organizer: 2008 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing
  • Place of Presentation: Gold Coast, Australia
• [Presentation] Joint Decoding with LDPC Codes for Wireless Sensor Network. (2008)
  • Author(s): Sayaka Kosuga, Hiroyuki Yashima
  • Organizer: 2008 RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing
  • Place of Presentation: Gold Coast, Australia
• [Presentation] Performance Analysis of 2-D OCDM Systems using Heterodyne Detection Receiver and OPPM Signaling (2007)
  • Author(s): Anh T. Pham and H. Yashima
  • Organizer: IEEE 20th Annual Lasers and Electro Optics Society Meeting(LEOS'07)
  • Place of Presentation: Orlando, FL, USA