Efficient channel coding for multipulse pulse position modulation in terrestrial FSO systems

Fang Xu; Mohammad-Ali Khalighi; Salah Bourennane

doi:10.1117/12.826148

24 August 2009 Efficient channel coding for multipulse pulse position modulation in terrestrial FSO systems

Fang Xu, Mohammad-Ali Khalighi, Salah Bourennane

Proceedings Volume 7464, Free-Space Laser Communications IX; 74640M (2009) https://doi.org/10.1117/12.826148
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

For terrestrial free space optical (FSO) systems, we investigate the use of multipulse pulse position modulation (MPPM), which has the advantage of bandwidth efficiency compared to the classical PPM. We first discuss the upper-bound on the information transmission rate for the case of a Gaussian (turbulence-free) channel. We next consider the channel coding issue for MPPM. We propose to use a simple binary convolutional code and to perform iterative soft demodulation and channel decoding at the receiver. We study the performance of this scheme by presenting some numerical results for the cases of Gaussian and weak-turbulence channels. We also show that, in contrast to PPM, the bit-symbol mapping is an important point for MPPM, especially regarding the proposed iterative receiver. In this view, we propose design rules for optimal bit-symbol mapping.

Citation Download Citation

Fang Xu, Mohammad-Ali Khalighi, and Salah Bourennane "Efficient channel coding for multipulse pulse position modulation in terrestrial FSO systems", Proc. SPIE 7464, Free-Space Laser Communications IX, 74640M (24 August 2009); https://doi.org/10.1117/12.826148

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