Optimization of Irregular LDPC Codes on Rician Channel
For irregular LDPC codes,the density evolution method can track the messages to find out the noise threshold, enabling optimization of the degree distribution. A new optimized scheme for irregular LDPC codes is proposed in this paper, which is combining Zhengya Hes modified Particle Swarm Optimization(PSO) algorithm with discrete density evolution(DDE) for the offset BP-based decoding algorithm.Several optimized degree distribution pairs and corresponding threshold of LDPC codes over rician channel were given using the proposed scheme. The performance of the optimized LDPC codes was also analyzed. Simulation results shows that the proposed scheme is effective.
irregular LDPC codes discrete density evolution Particle Swarm Optimization offset BP-based decoding
Xu Hua Xu Cheng-qi Zheng Xiao-chuan
Department of Information Engineering Nanjing University of Posts and Telecommunications Nanjing, 210003, P.R.China
国际会议
武汉
英文
381-383
2005-09-23（万方平台首次上网日期，不代表论文的发表时间）