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Mitigation Techniques of Channel Collisions in the TTFR-Based Asynchronous Spectral Phase-Encoded Optical CDMA System  

Miyazawa, Takaya (National Institute of Information and Communications Technology (NICT))
Sasase, Iwao (Department of Information and Computer Science, Keio University)
Publication Information
Journal of Communications and Networks / v.11, no.1, 2009 , pp. 1-10 More about this Journal
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 codedivision multiple-access (CDMA) system combined with timeencoding. 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.
Keywords
Channel collision; multiple access interference (MAI); optical CDMA; spectral phase-encoding; tunable-transmitter/fixedreceiver(TTFR);
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