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基于信道容量规则和分组分割 ,构造自适应于AWGN和Rayleigh两种信道特征的多级编码系统 ,分量码选用删除型卷积码 ,系统性能与未编码系统和BCH码为分量码的系统作比较 .在多阶段译码中提出利用信道状态信息的软判决支路度量计算公式 ,比较软、硬判决译码对系统性能的影响 ,为移动信道编码调制系统的最佳设计度量提供参考
Based on the channel capacity rule and packet segmentation, a multistage coding system adaptive to both AWGN and Rayleigh channel characteristics is constructed. The component codes are selected using a convolutional code with a punctured convolutional code. The performance of the system is compared with those of uncoded systems and BCH codes In the multi-stage decoding, the calculation formula of soft decision branch metric using channel state information is proposed, and the influence of soft and hard decision decoding on system performance is compared to provide a reference for the optimal design of mobile channel coding and modulation system