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IEICE Transactions on Communications 2008 E91-B(3):700-709; doi:10.1093/ietcom/e91-b.3.700
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Fiber-Optic Transmission for Communications

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

Kohki OHBA1, Takaya MIYAZAWA2 and Iwao SASASE1

1 The authors are with the Department of Information and Computer Science, Keio University, Yokohama-shi, 223-8522 Japan. E-mail: ohba{at}sasase.ics.keio.ac.jp, 2 The author is with the National Institute of Information and Communications Technology (NICT), Koganei-shi, 184-8795, Japan.


  Abstract

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.

Key Words: optical CDMA, MAI, optical power selector

Manuscript received April 13, 2007. Manuscript revised September 3, 2007.


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