摘要： 为降低Turbo译码延迟，提出一种自适应控制的迭代停止算法。利用SISO1产生的对数似然比 代替SISO2产生的对数似然比 ，并根据信道信噪比的不同，自适应选择门限参数。理论推导和仿真结果表明，该算法能有效降低译码平均迭代次数，消除单一迭代算法的不稳定性，提高译码速率。

关键词: Turbo码, 迭代译码, 停止准则, 自适应

Abstract: In order to shorten the Turbo decoding delay, a new adaptive iterative stopping algorithm is given. The new algorithm replaces the Log-Likelihood Ratio(LLR) produced by SISO2 with produced by SISO1. Based on the differences in Signal Noise Raito(SNR) of signal channel, the new algorithm chooses threshold parameters adaptively as well as reducing the iterations and the decoding delay to the greatest extent. Theoretical computation and simulation results show that the new algorithm can reduce the average iterations of the decoding effectively, eliminate the instability of single iterative algorithm and increase the decoding rate.

Key words: Turbo code, iterative decoding, stopping criterion, adaptive

中图分类号: 

• TN927.2