LDPC码在各种衰落信道中性能分析  

Performance of LDPC codes in fading channels

作　　者：尹芳[1] 滕舟[1,2] 仇洪冰[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]浙江省气象信息网络中心,浙江杭州310017

出　　处：《桂林电子科技大学学报》2010年第3期193-197,共5页Journal of Guilin University of Electronic Technology

基　　金：广西自然科学基金(0731025)

摘　　要：信道的特征很大程度上决定了通信系统的性能,目前对LDPC码的研究主要集中在高斯和瑞利信道中,为了研究各种衰落信道(瑞利信道、莱斯信道)中LDPC码的性能和适用性,将通过MATLAB仿真,以及对LDPC码在各种衰落信道中的性能的分析,并与AWGN信道进行对比。重点研究了LDPC码在低莱斯因子信道中的性能和适用性,并改进其译码算法。经仿真结果表明,LDPC码在各种衰落信道中都具有良好的性能,非常适合作为未来移动通信技术。The performance of channel is depended on the channel＇s characteristics. The wireless mobile channels＇ characteristic is multipath transmittal. Multipath transmittal causes small-scale fading, or fading in short. Nowadays, the most attention about LDPC codes is paid on the application in the channels of BSC, AWGN and Rayleigh. This paper analyzes and simulates the performance of the low density parity check codes in fading channels, the Rayleigh channels and Rice channels for example, and makes the compare with the AWGN. The important idea is to analyze the performance of the low density parity check codes in Rice channel of small Rice Kfactor, and improve the decoding methods. The results of simulation indicate that the low density parity check codes have excellent performance in fading channels and it＇s suitable to the mobile communication in the future.

关 键 词：LDPC 莱斯信道 瑞利信道 高斯信道 BP译码 LLR译码 

分 类 号：TN911.22[电子电信—通信与信息系统]