摘要
介绍了非规则重复累积码(IRA)的结构,对其Tanner图和校验矩阵进行了分析。IRA码的构造分为优化度分布和设计奇偶校验矩阵2部分。在AWGN信道下,对给定的噪声方差,采用高斯近似的方法优化度分布并得出优化结果。根据度分布和相应规则设计奇偶校验矩阵,给出了设计步骤。对设计出的码进行计算机仿真,结果表明这类码相对于计算机随机构造的LDPC码能带来性能上的提高,且随码长增加,码的性能有明显改善。
The structure of irregular repeat accumulate codes is introduced. We analyzed Tanner graph and parity check matrix of the IRA codes. The construction of IRA codes includes the optimization of degree distribution and the design of parity check matrix. For a given noise variance, the optimized degree sequences are deduced with Gaussian approximation in AWGN channels. Then design process of the parity check matrix is given. Simulations show that the IRA codes we designed have more good performance than the LDPC codes designed by computer search and the performance becomes better with the longer code length.
出处
《无线电通信技术》
2007年第4期21-24,共4页
Radio Communications Technology
基金
国家自然科学基金资助项目(60572176)
关键词
非规则重复累积码
LDPC码
高斯近似
度分布
irregular repeat accumulate codes
LDPC codes
Gaussian approximation
degree distribution
