A Mitigation Technique of High-Power MAI in the Multimedia Optical CDMA System with the Optical Power Selector

Kohki OHBA  Takaya MIYAZAWA  Iwao SASASE  

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B   No.3   pp.700-709
Publication Date: 2008/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.3.700
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
optical CDMA,  MAI,  optical power selector,  

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Summary: 
In this paper, we propose a mitigation system of high-level multiple access interference (MAI) for multimedia optical Code-Division Multiple-Access (CDMA) systems using the optical power selector (OPS). The proposed system can eliminate high-intensity MAI at the receiver for low-priority users. Moreover, the proposed system can reduce by half the required number of code sequences compared to the conventional scheme. As a result, the proposed system can increase the number of weights at the same code-length and, thus, obtain higher code spreading gain. We analyze performances of the proposed system and show that both high-priority users and low-priority users achieve lower bit error rates in comparison to the conventional scheme.