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Spreading Sequences for Asynchronous Spectrally Phase Encoded Optical CDMA

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2 Author(s)
Omrani, R. ; Dept. of Electr. Eng. Syst., Univ. of Southern California, Los Angeles, CA ; Kumar, P.V.

In phase encoding optical CDMA (OCDMA) the spreading is achieved by encoding the phase of signal spectrum. In this paper we first derive a mathematical model for the output of phase encoding OCDMA systems. Based on this model we introduce a metric to design spreading sequences for asynchronous transmission. Then we connect the phase encoding sequence design problem to OFDM PMEPR (peak to mean envelope power ratio) problem. Using this connection we conclude that designing sequences with good properties for samples of timing delay guarantees that the same sequence to be good for all timing delays. Finally using generalized bent function we manage to construct a family of sequences which are good for asynchronous phase encoding OCDMA systems and using these sequences we introduce an M-ary modulation scheme for phase encoding OCDMA

Published in:

Information Theory, 2006 IEEE International Symposium on

Date of Conference:

9-14 July 2006