Analysis the Performance of a LDPC Coded FSO System with Q-ary Pulse-Position Modulation
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 20dB 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.
Low density parity check (LDPC) code free space optics (FSO) bit interleaved coded modulation (BICM) multiple input/multiple output(MIMO) processing pulse position modulation (PPM) multi laser multi detector (MLMD)
Bobby Barua Dalia Barua
Department of EEE,Ahsanullah University of Science and Technology Dhaka, Bangladesh Student, Institute of ICT,Bangladesh University of Engineering and Technology Dhaka, Bangladesh
国际会议
上海
英文
339-343
2011-03-11（万方平台首次上网日期，不代表论文的发表时间）