基于交织的错误图样对DVB-S协议级联码译码性能的影响

Influence of Interlaced Error Patterns On Decoding Performance of DVB-S Protocol Concatenated Codes

信道编码技术在保证数字通信系统可靠传输方面具有重要作用,随着数字电视广播的覆盖不断提升,不法分子利用数字电视广播从事非法活动的情况时有发生;为了在信道编码层面为无线电环境管理提供技术手段,改进编码方式,提高数字通信系统传输可靠性,以DVB-S协议标准中物理层级联码作为研究对象,建立了由RS码、卷积码和卷积器交织器构成的典型级联码的通信模型,深入分析了级联码的体系结构,并在编码体制上找到了DVB-S协议标准中级联码存在的弱点,设计了一种基于交织的错误图样,给出了设计思路和具体设计方法,仿真研究了错误符号中含有不同错误比特数的错误图样对级联码译码性能的影响,并与突发错误图样进行了对比;仿真结果表明,基于交织的错误图样对级联码的译码性能影响要大于突发错误。

Channel coding technology plays an important role in guaranteeing the reliable transmission of digital communication system.With the continuous improvement of the coverage of digital TV broadcasting,illegal activities involving illegal digital TV broadcasting occur frequently.In order to provide technical means for radio environment management at the channel coding level,improve the coding mode and transmission reliability of the digital communication system,the error pattern is proposed:take the physical level code in the DVB-S protocol standard as the research object,establish a communication model consisting of RS codes,convolutional codes and convolutional interleaver,analyze the architecture of concatenated codes,find the weakness of the DVB-S protocol standard of concatenated codes exist in the encoding system.An error pattern based on interleaving is designed,giving the design ideas and specific design methods.Compared with burst error pattern,the effect of the error pattern with different number of error bits in error symbols of concatenated codes decoding performance is simulated,The simulation results show that the interlaced error pattern has a greater impact on the decoding performance of the concatenated code than the burst error.Keywords:concatenated code;interleave;error pattern