软输出维特比译码器结构优化

Optimization of Architecture of SOVA Decoder

分析 Turbo Code的软输出维特比 ( SOVA)译码器的结构优化方法 .首先简介了SOVA译码原理 ;然后从两方面讨论 SOVA算法的硬件实现的优化问题 :一是讨论硬件结构的比特级优化结构 ,提高译码速度 ;二是在算法级将代数环的理论引入到算法的分析中 ,将实数环上的非线性运算转换成另一个环上的线性运算 ,从而简化译码器结构 。

This article focuses on the optimization of architecture for the soft output viterbi algorithm (SOVA) decoder of Turbo code. Principle of the SOVA decoder is first introduced, and two features regarding the hardware implementation in its optimization are analyzed. The one is based on the bit level hardware and the other based on the algebra ring method, which transforms the non linear operations on real ring to linear operations on a defined ring. In this way the decoder architecture is streamlined and the running speed accelerated.