基于维特比算法的卷积码译码器设计

Decoder Design for Convolutional Code Based on Viterbi Method

卷积码的状态转移规律可以用网格图来描述,网格图是一种能清楚显示状态转移的时间依赖性状态图。文章在介绍卷积码原理的基础上,对维特比译码实现过程中的状态网格图的规律进行了深入研究,采用了状态路径度量的"加、比、选"运算方法、保存路径转移的回溯译码方法等,有效的提高整个卷积码译码器的性能。最后进行了编程仿真,结果显示维特比译码的效果比较理想,满足了设计的要求。

Convolutional codes transfer of the state law can be described by Grid plans. This paper presents some efficient methods to reduce the number of bits to represent the path metrics and the number of saving paths in the process of tracking back. Consequently, the RAM size needed for saving metrics and paths as well as the power consumption are sharply decreased. The end, the simulation result prove the design process is right.