Turbo译码的自适应迭代停止算法  

Adaptive Iterative Stopping Algorithm for Turbo Decoding

作　　者：王艳岭[1] 达新宇[1] 

机构地区：[1]空军工程大学电讯工程学院,西安710077

出　　处：《计算机工程》2011年第9期282-283,287,共3页Computer Engineering

基　　金：陕西省自然科学基金资助项目(2009JM8001-3)

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Λ(i1)(m)代替SISO2产生的对数似然比Λ(i 2?)1(mπ?1),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。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.

关 键 词：TURBO码 迭代译码 停止准则 自适应 

分 类 号：TN927.2[电子电信—通信与信息系统]