基于Turbo码译码的动态停止迭代译码算法

Stopping Algorithm of Dynamic Iterative Decoding on Turbo Code

Turbo码译码是迭代译码,译码所带来的延时较大.为了解决这个问题,可以运用动态的迭代译码算法.基于文献[1]提出来的迭代停止判决的思想,根据信道条件的好坏的情况下,提出了CRC-SDR迭代停止判决.并对所提出的CRC-SDR停止迭代判决进行了仿真,与其他译码迭代停止判决的仿真结果相比,所提出的CRC-SDR的译码平均迭代次数明显降低,且译码性能没有下降,故提出来的CRC-SDR改进算法是可行有效的.

Since turbo decoding is an iterative algorithm, the decoding delay may not be acceptable. We can using dynamic iterative decoding algorithm to solve the delay＇s problem. Based on the method in reference[ 1 ] ,that is to say, we presented CRC - SDR that is based on the channel＇s condition. By simulating the improved method and comparing with others＇ result, the average number of iterations was decreased and the BER performance obtained was not degraded. So the improved method is valid and useful.