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BER performance of M-ary PPM free-space optical communications with channel fading

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3 Author(s)
Mohammed R. Abaza ; Department of Electronics and Communications, Arab Academy for Science, Technology and Maritime Transport, Egypt ; Nazmi A. Mohammed ; Mostafa H. Aly

In this paper, we have shown the advantage of using 4-ary pulse position modulation (PPM) using intensity modulation with direct detection (IM/DD) as a power efficient system over coherent differential phase shift keying (DPSK) as a bandwidth efficient system in free space optical (FSO) weak turbulence channel (log-normal channel) and strong turbulence channel (negative-exponential channel). The comparison is done using avalanche photodetector (APD) and PIN receivers. A correct expression is derived for DPSK in negative-exponential channel using APD. The performance of 4-ary PPM is enhanced using high order 256-PPM modulation and forward error correction (FEC). We employed standard Reed-Solomon RS (255,239) and RS (255,223). This work was further extended by exploiting concatenated Reed-Solomon codes, RS (255,239) as an outer code and RS (255,223) as an inner code for higher efficiency.

Published in:

8th International Conference on High-capacity Optical Networks and Emerging Technologies

Date of Conference:

19-21 Dec. 2011