Abstract
A hybrid binary phase shift keying-modified multi-pulse pulse position modulation (hybrid
BPSK-modified MPPM) scheme is proposed as a new modulation technique to improve the performance of
both conventional binary phase shift keying (BPSK) and multi-pulse pulse position modulation
(MPPM) techniques in optical fiber communications systems. In conventional BPSK scheme, a
consecutive stream of low power BPSK symbols are transmitted. However, in the proposed scheme, a
less number of high power BPSK symbols are transmitted in a hybrid frame and their positions are
exploited to transmit more bits. That is, the transmitted information is carried in both the
positions and phases of the transmitted pulses. The transmission characteristics, transmitter and
receiver block diagram, bandwidth-utilization, and optimum decoding process for the proposed
scheme are all studied in this paper. Several performance measures are also derived and compared
to those of conventional schemes in optical fiber channels. Our results reveal that, under an
average power constraint, the proposed hybrid BPSK-modified MPPM scheme achieves much lower levels
of bit-error rates and symbol-error rates than those of ordinary BPSK and ordinary MPPM schemes,
respectively, for both moderate or high signal-to-noise ratios. In addition, the proposed
modulation scheme achieves much higher bandwidth-utilization efficiencies than those of ordinary
schemes.
© 2013 IEEE
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