Turbo码译码器“及早判决”门限的确定及输出信噪比停止迭代准则  

A Threshold for the “Early Detection” Method and an Output SNR Stop Criterion for Turbo Codes

作　　者：李祥明[1] 乐光新[1] 尹长川[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《北京邮电大学学报》2000年第1期46-50,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金资助项目 !( 6 9872 0 0 8);国家教委高等学校博士学科点专项基金资助项目!( 970 0 130 1)

摘　　要：提出将实际的 AWGN信道与 Turbo码译码器构成的联合信道看成一个等效 AWGN信道 ,在此基础上 ,提出一种新的采用译码器输出对数似然比序列的信噪比作为译码器停止迭代的判决准则 .为减少译码复杂度 ,可以将 Turbo码译码过程中对数似然比超过某一门限的符号及时判决输出 .给出了门限值的理论确定方法 .A hypothesis to take the physical channel and the Turbo decoder as a joint equivalent AWGN channel is presented. On the basis of this hypothesis, one can use the signal to noise ratio of the Turbo decoder output LLR as a criterion to stop the iterative procedure. To reduce the decoder complexity, one can make a decision for the symbol whose LLR is larger than a given threshold and output it. A theoretical threshold is given.

关 键 词：信道编码 TURBO码 并行级联码 译码器 信噪比 

分 类 号：TN911.22[电子电信—通信与信息系统]