New decoding scheme for product accumulate code over an optical PPM channel  

作　　者：郭建中 艾勇 谭莹 左涛 黄海波 

机构地区：[1]College of Electronics & Information Engineering, Wuhan Textile University [2]School of Electronics Information, Wuhan University

出　　处：《Optoelectronics Letters》2011年第2期147-150,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.10477014) Jointing the Foundation of Aeronautical Science and Technology

摘　　要：A new decoding scheme for product accumulate (PA) code over a space optical Poisson/ pulse-position modulation (PPM) channel is investigated. In this scheme, the PPM and the accumulator of the PA code are taken as a single inner code, decoded with an iterative demodulating-decoding technique based on Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm, rather than belief propagation (BP) algorithm in the original scheme. Simulation results show that this scheme provides much better bit error rate (BER) performance. At a BER of 10-5, the new scheme has a gain of 1.8 dB more than the original one. In addition, extrinsic information transfer (EXIT) charts are employed to analyze and compare the performance. The results indicate that the new scheme has not only better BER performance, but also lower error floor.

关 键 词：ALGORITHMS Bit error rate DEMODULATION 

分 类 号：TN911.22[电子电信—通信与信息系统] TN929.1[电子电信—信息与通信工程]