Turbo码交织器的等差错保护研究

Research on the Equal Error Protection of the Interleaver in the Turbo Code

Turbo码具有近Shannon限的突出纠错能力,是一种高性能的信道编码。文中分析了一般交织器的设计规则和进行Turbo码编码时存在的等差错保护问题。在此基础上,针对分组交织器提出了沿交织矩阵主对角线循环的信息写入机制,对于s-随机交织器增加了随机索引地址生成的约束条件,最终得到了两种具有等差错保护功能的Turbo码交织器。仿真结果表明,改进的交织器明显改善了Turbo码的误比特率性能。

The Turbo code is a high performance channel coding mechanism, which has a near Shannon limit ermr correction capability. In this paper, the design rules of the interleaver are analyzed and the equal error protection of the Turbo coding is introduced. Then, for the block interleaver, an information input scheme is proposed that writes a- long the main diagonal of the interleaving matrix; for the s-random interleaver, an additional constraint is provided when randomly generating the index address. Finally, two interleavers with equal error protection capability are obtained. Simulation results show that these modified interleavers can significantly improve the bit error rate of the Turbo code.