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Proceedings Paper

Efficient channel coding for multipulse pulse position modulation in terrestrial FSO systems
Author(s): Fang Xu; Mohammad-Ali Khalighi; Salah Bourennane
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Paper 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.

Paper Details

Date Published: 24 August 2009
PDF: 12 pages
Proc. SPIE 7464, Free-Space Laser Communications IX, 74640M (24 August 2009); doi: 10.1117/12.826148
Show Author Affiliations
Fang Xu, Institut Fresnel (France)
Mohammad-Ali Khalighi, Institut Fresnel (France)
Salah Bourennane, Institut Fresnel (France)


Published in SPIE Proceedings Vol. 7464:
Free-Space Laser Communications IX
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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