一种新的联合译码方案研究

The Study of A Novel Combined Decoding Scheme

提出了一种新的联合译码方案。该方案结合了卷积码和Turbo码译码算法的优势,在译码端采用三个译码器,前两个译码依然为经典Turbo码译码结构并采用Log-Map算法,最后一个译码器接收译好的信息位、校验位和外信息值,采用维特比译码算法。经过迭代译码,能够进一步提高传统Turbo译码的性能。仿真结果证明在10次迭代以前,至少能够获得0.1dB的编码增益。

The article proposes a novel combined decoding scheme. This structure combines the superiority of concolutional code and Turbo code. There are three decoders. The first two components are arranged as the classical parallel concatenated decoding scheme and using the Log Maximum A Posteriori ( Log -Map) algorithm. The third receiver who is applied with soft output Viterbi algorithm ( SOVA) takes over the system bit,the first parity bit and priori information from the first two decoders. It can improve conven-tional Turbo code performance further. Simulation result shows that it achieves 0. 1dB performance gains at least before 10 iterations.