基于EXIT图的TET-LDPC码优化分析  

Optimization and Analysis of TET-LDPC Code Based on EXIT Chart

作　　者：肖旻[1] 张宏怡[1] 

机构地区：[1]厦门理工学院光电与通信工程学院,福建厦门361024

出　　处：《厦门理工学院学报》2014年第5期51-55,共5页Journal of Xiamen University of Technology

基　　金：国家自然科学基金项目(61202013);厦门理工学院科研启动基金项目(90010628)

摘　　要：两边类型低密度奇偶校验码(two-edge type low density parity check,TET-LDPC码)是一种高效的信道纠错码,其性能受到删余变量节点度(punctured variable node degree,PVN度)的影响.为了分析PVN度对TET-LDPC码纠错性能的影响,基于外信息转移图(extrinsic information transfer,EXIT图)估算了TET-LDPC码在不同PVN度情况下的门限值,利用门限值的好坏来分析纠错性能的优劣,进而通过选取门限值好的PVN度优化TET-LDPC码.仿真结果显示,经过EXIT图优化的TET-LDPC码具有更好的纠错性能.利用EXIT图优化分析TET-LDPC码的方法,比现有的仿真试值法更加简捷、直观.Two-edge type LDPC （ TET-LDPC） codes are a class of good channel error-correction codes. Their performances are significantly impacted by punctured variable node （ PVN） degrees. In order to analyze the impact of PVN degrees on TET-LDPC codes, an optimization and analysis method was proposed to estimate the thresholds of TET-LDPC codes with different PVN degrees based on extrinsic information transfer （ EXIT） charts. Since good thresholds indicated good performances, the optimization of TET-LDPC codes was accomplished by choosing PVN degrees with good thresholds. Simulation results showed that the TET-LDPC codes optimized by the proposed method outperformed other TET-LDPC codes. The proposed EXIT-chart-based optimization and analysis method is easier and more visual than the exiting performance-simulation method.

关 键 词：TET-LDPC码 EXIT图 门限值 优化分析 

分 类 号：TN929.53[电子电信—通信与信息系统]