Mitigation of MAIs by the second encoding scheme in TTFR-based optical CDMA systems

Takaya Miyazawa, Iwao Sasase

Research output: Contribution to journalConference articlepeer-review


In optical code division multiple access(CDMA) networks, the system which equips tunable transmitters and fixed receivers (i.e. TTFR) achieves simple configuration and protocols. However, when there are other simultaneous users who transmits pulses with the same code, large amount of multiple access interferences(MAIs) cause serious performance degradation. In this paper, we propose second encoding scheme in which first-encoded optical pulses are further encoded by the second optical orthogonal code(OOC) assigned to the transmitter. The proposed system with second encoding scheme can achieve higher processing gain in the correlator than the conventional system without second encoding scheme because the number of weights increases due to the second encoding. This results in the mitigation of the effect of MAIs. We analyze performance of the proposed system and show that the proposed system with second coding scheme can achieve better bit error probability than the conventional system without second encoding scheme.

Original languageEnglish
Article number1523362
JournalIEEE International Symposium on Information Theory - Proceedings
Publication statusPublished - 2005
Externally publishedYes
Event2005 IEEE International Symposium on Information Theory, ISIT 05 - Adelaide, Australia
Duration: 2005 Sept 42005 Sept 9

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Information Systems
  • Modelling and Simulation
  • Applied Mathematics


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