一种AWGN信道下非规则LDPC码的优化方法  

Optimization method for irregular LDPC codes in AWGN channel

作　　者：毛倩[1] 董德存[2] 曾小清[2] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]同济大学交通运输工程学院,上海200092

出　　处：《计算机应用》2010年第2期292-294,共3页journal of Computer Applications

基　　金：国家863计划项目(2007AA11Z247)

摘　　要：提出了一种加性高斯噪声(AWGN)信道下非规则低密度奇偶校验(LDPC)码的优化方法。利用LDPC码迭代译码算法下变量节点与校验节点的EX IT曲线之间的面积反映码的收敛阈值与香农限的差距这一特点,设计表示两条EX IT曲线之间面积的函数F,该函数可以衡量非规则LDPC码的性能,F值越小,LDPC码的收敛阈值就越接近香农限。仿真显示,合理设计变量节点和校验节点,减小函数F的值,能够提高非规则LDPC码的性能。A method to optimize irregular Low-Density-Parity-Check （LDPC） codes was proposed. The area gap between the EXIT curves of variable-node decoder and check-nodes decoder of a LDPC code reflects a rate loss compared to Shannon limit, a function F which computed the area gap was designed to evaluate the performance of the irregular LDPC codes. The lower the value F is, the smaller the gap between the convergence threshold and the Shannon limit is. Simulation shows that the performance of irregular LDPC codes will be improved by designing variable-node decoder and check-nodes decoder appropriately and reducing F.

关 键 词：低密度奇偶校验码 外部信息转换(EXIT)图 加性高斯白噪声 迭代译码 收敛阈值 

分 类 号：TN911.22[电子电信—通信与信息系统] TP919.81[电子电信—信息与通信工程]