Abstract
In this paper, the effect of removing the symbol-synchronous
assumption in the multicode-keying incoherent optical code-division
multiple access (O-CDMA) systems is studied. Under true symbol
asynchronism, the multicode-keying modulation can create “two hits” in the
periodic cross-correlation process even though “one-hit” optical codes are
used. Three pulse-erasure methods of reducing the occurrence of two hits
are studied. By applying optical orthogonal codes to permute the pulses in
codewords, a method of constructing one-hit optical codes that can
eliminate the occurrence of two hits in “symbol-asynchronous”
multicode-keying O-CDMA and enlarge code cardinality is proposed.
Performance analytical models for these three two-hit reduction methods
and the new optical codes are formulated. Finally, numerical examples are
given to compare their performances, and computer-simulation results are
presented to validate the analytical models.
© 2016 IEEE
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