用于多址接入信道的LDPC码优化设计  

LDPC Optimization for Multiple Access Channel

作　　者：章翔[1] 别志松[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《北京邮电大学学报》2008年第3期9-12,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家"973计划"项目(2007CB310604);国家自然科学基金项目(6077210860702048)

摘　　要：将低密度校验码(LDPC)用于多址接入信道,直接采用不同的校验矩阵作为区分用户的唯一特征.采用一种简化算法对多址接入信道因子节点的消息进行更新,并为多用户低密度校验码的消息传递过程设计了高斯近似密度进化算法,在此基础上用差分进化算法对非规则低密度校验码的度序列进行优化设计.分析和仿真结果表明,所设计的非规则低密度校验码在多址接入信道中具有良好性能.Low density parity check codes are used to multiple access channels and the user-specific check matrices are used as the unique characteristics. A simplified algorithm is adopted to update the output message of multiple access channel factor nodes. Density evolution algorithm with Gaussian approximations is designed for the message propagation process of multi-user low density parity check codes. Based on the Gaussian approximation algorithm, the degree sequences for irregular low density parity check codes are optimized by using differential evolution algorithm. Analysis and simulation results show that the designed low density parity check codes have good performance on multiple access channel.

关 键 词：低密度校验码 多址接入信道 高斯近似 密度进化 差分进化 

分 类 号：TN911.23[电子电信—通信与信息系统]