Abstract
In this paper, we propose a novel multiple-access interference
(MAI) cancellation technique using a reference signal, which
contains no data components (data-free) of the desired signal, and then simplifies
the receiver configuration in synchronous <i>M</i>-ary frequency-shift
keying optical code-division multiple-access (FSK-OCDMA) network. In doing
so, we have taken advantage of a recently introduced energy-saving unipolar
prime-code family, referred to as double-padded modified prime-code (DPMPC)
as the spreading codes. In the theoretical analysis, the system upper bounded
bit error rate (BER) is derived taking into account the Poisson effect on
the I/O characteristics of the photodetectors. We have found that when the
bit rate is constant, the capacity of this system increases by employing the
proposed interference canceller and spreading code as compared with the synchronous <i>M</i>-ary pulse-position
modulation OCDMA system with an existing interference canceller. In contrast
to wavelength-division multiple access, a fewer set of wavelengths is needed
as a result of only <i>M</i>-ary source coding.
© 2008 IEEE
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