Sequences for phase-encoded optical CDMA

Authors:
Reza Omrani;Pankaj Bhambhani;P. Vijay Kumar
Affiliations:
EE-Systems, University of Southern California, Los Angeles, CA;ECE Department, Indian Institute of Science, Bangalore;ECE Department, Indian Institute of Science, Bangalore
Venue:
SSC'07 Proceedings of the 2007 international conference on Sequences, subsequences, and consequences
Year:
2007

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Abstract

In phase-encoded optical CDMA (OCDMA) spreading is achieved by encoding the phase of signal spectrum. Here, a mathematical model for the output signal of a phase-encoded OCDMA system is first derived. This is shown to lead to a performance metric for the design of spreading sequences for asynchronous transmission. Generalized bent functions are used to construct a family of efficient phase-encoding sequences. It is shown how M-ary modulation of these spreading sequences is possible. The problem of designing efficient phaseencoded sequences is then related to the problem of minimizing PMEPR (peak-to-mean envelope power ratio) in an OFDM communication system.