Analysis the performance of a LDPC coded FSO system with Q-ary pulse-position modulation

Author

Barua, Bobby ; Barua, Dalia

Author_Institution

Dept. of EEE, Ahsanullah Univ. of Sci. & Technol., Dhaka, Bangladesh

Volume

1

fYear

2011

fDate

11-13 March 2011

Firstpage

339

Lastpage

343

Abstract

Free-space optical communication is an attractive and cost-effective solution for high-rate image, voice, and data transmission. However, optical wave propagation through the air experiences fluctuation in amplitude and phase due to atmospheric turbulence. In this paper, an analytical approach is presented to evaluate the bit error rate performance of a free space optical link using LDPC coded Q-ary optical PPM through atmospheric turbulence channel. Performance results are evaluated for multiple-laser and multiple photo-detector combination without and with LDPC code to combat the effect of atmospheric turbulence. The performance results are evaluated in terms of bit error rate (BER) and coding gain. It is found that LDPC coded system provides significant coding gain of 10 to 20 dB over uncoded system can be evaluated at BER 10^-12 for multiple source and photo-detector combinations. It also provides better performance under strong turbulence rather than weak turbulence conditions.

Keywords

atmospheric turbulence; error statistics; optical links; optical modulation; parity check codes; photodetectors; pulse position modulation; BER; LDPC coded FSO system; Q-ary optical PPM; Q-ary pulse-position modulation; atmospheric turbulence channel; bit error rate performance; free space optical link; free-space optical communication; gain 10 dB to 20 dB; high-rate image transmission; multiple laser beam detector; multiple photodetector; voice transmission; Adaptive optics; Bit error rate; Encoding; MIMO; Modulation; Optical fiber communication; Parity check codes; Low density parity check (LDPC) code; bit interleaved coded modulation (BICM); free space optics (FSO); multi laser multi detector (MLMD); multiple input/multiple output(MIMO) processing; pulse position modulation (PPM);

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Research and Development (ICCRD), 2011 3rd International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-61284-839-6

Type

conf

DOI

10.1109/ICCRD.2011.5764032

Filename

5764032