Research And Simulation On The Parallel Decoding And Parallel Interleaver Of Turbo Codes

Channel coding is a key technique which ensures the reliable information transmission and it is widely used in modern digital communication systems. As a channel coding scheme, Turbo code has been paid close attentions for its excellent performance. Also, Turbo code has been accepted as a channel coding schemes in 3G/B3G systems. However, the high decoding time delay of Turbo codes can not be ignored, and it is a key factor preventing its application. Therefore, there are many solutions for it, and the sub-block segmentation decoding scheme is one of them. It can reduce time delay markedly while keeping good bit error performance.In the scheme, memory access violation in interleaving and de-interleaving is the bottleneck for reducing time delay further, and it can be solved by parallel interleaver designing. In this paper, through the research of interleaver design requirements, parallel interleaver judging condition and existing parallel interleaver schemes, we provide two parallel interleaver schemes satisfying S-distance property and they get specific interleaver based on different initial conditions. Finally, simulations are provided for both the schemes, and from the results, both the schemes can cause a performance increase of Turbo codes.