中文摘要：

约束维特比算法是利用已知的正确信息，对维特比算法进行改进。本文针对约束维特比算法进行了探讨，并对其性能进行了仿真实验。仿真结果证明，在二进制均衡信道中当采用约束维特比算法时，性能得到了较大的提高。

英文摘要：

The constrained Viterbi algorithm （ C - VA） makes use of the fight decoding results to improve the conventional Viterbi algorithm. In this paper, we mainly study on the constrained Viterbi algorithm and compare the performance of C - VA with VA. The result of simulation shows that the performance has been greatly improved under binary symmetric channels （BSC） condition,