半定初态卷积编码及其译码算法

Semi-determinative initial state convolutional coding and decoding algorithm

在短波通信的自动链路建立过程中,为了获得尽量高的编码增益和抗干扰性能,要求编译码性能要好且编码后的码字要短.该文首次提出半定初态卷积编码的概念,并在此基础上给出了其编译码算法.该编译码算法较好地解决了编码性能与编码后码字长度的矛盾.实验结果表明,在保证编码后码字长度尽量短的条件下,其性能逼近最佳性能,是一种十分实用的编译码算法.

In the processing of shortwave communication, automatic link establishment (ALE) demands well-performed coding and decoding and a codeword shortly after coding in order to obtain more coding gain and anti-jamming performance. A convolutional coding concept with semi-determinative initial state is proposed along with its coding and decoding algorithm. This algorithm perfectly deals with the conflict between the performance of coding and the codeword length after coding. Being sure of the codeword length, its performance approximates its optimum performance, making it a pragmatic coding and decoding algorithm.