Mitigation techniques of channel collisions in the TTFR-based asynchronous spectral phase-encoded optical CDMA system

Takaya Miyazawa, Iwao Sasase

Research output: Contribution to journalArticle

Abstract

In this paper, we propose a chip-level detection and a spectral-slice scheme for the tunable-transmitter/fixed-receiver (TTFR)-based asynchronous spectral phase-encoded optical code-division multiple-access (CDMA) system combined with time-encoding. The chip-level detection can enhance the tolerance of multiple access interference (MAI) because the channel collision does not occur as long as there is at least one weighted position without MAI. Moreover, the spectral-slice scheme can reduce the interference probability because the MAI with the different frequency has no adverse effects on the channel collision rate. As a result, these techniques mitigate channel collisions. We analyze the channel collision rate theoretically, and show that the proposed system can achieve a lower channel collision rate in comparison to both conventional systems with and without the time-encoding method.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJournal of Communications and Networks
Volume11
Issue number1
Publication statusPublished - 2009 Feb

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Multiple access interference
Code division multiple access
Transmitters

Keywords

  • Channel collision
  • Multiple access interference (MAI)
  • Optical CDMA
  • Spectral phase-encoding
  • Tunable-transmitter/fixed-receiver (TTFR)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems

Cite this

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