非二进制RS-Turbo级联码性能研究

Study on Performance of Non-binary RS-Turbo Concatenated Codes

介绍了非二进制Turbo码的编码器结构,详细分析了逐符号对数MAP译码算法。在此基础上,设计了一种RS-Turbo级联码方案,该方案包括一个RS(255,239,8)外码和一个非二进制Turbo内码。仿真结果表明,与单纯使用非二进制Turbo码相比,本文提出的级联方案可明显改善高信噪比情况下的BER性能,同时可降低迭代次数。另外,级联RS码可为Turbo迭代译码提供简单可行的停止准则。

The encoder structure of non-binary Turbo code is presented and the symbol-by-symbol log- MAP decoding algorithm is analyzed in detail. A new scheme of RS-Turbo concatenated codes is designed which consists of an RS （255,239,8） outer code followed by a non-binary Turbo inner code. The simulation results show that the proposed concatenated scheme can significantly improve the BER performance at high SNR and reduce the iteration number compared to non-binary Turbo code. Furthermore, the concatenated RS code can supply a simple stopping criterion for turbo iterative decoding.