Abstract
A new hybrid modulation scheme (PDM-QPSK–MPPM) for free space optical (FSO) communication is proposed in this paper, which is based on the combination of polarization-division-multiplexed quadrature phase-shift keying (PDM-QPSK) and multi-pulse pulse position modulation (MPPM). We describe the transmitter and receiver block diagram and the decoding scheme of proposed scheme, and derive the formulary expressions for symbol-error rate (SER) and upper bound of bit-error rate (BER) in Gamma–Gamma turbulence channel. Performance evaluations and comparisons are implemented through detailed analysis. The numerical results indicate that, under turbulence channel with average power constraint, the proposed hybrid PDM-QPSK–MPPM always offer better BER performance and SER performance than ordinary BPSK and MPPM. In addition, the proposed scheme offers higher bandwidth-utilization efficiency than conventional modulation formats.
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