一种新的停止判决算法  

A New Stopping Judgment Algorithm

作　　者：肖瀛[1] 李建平[1] 

机构地区：[1]中国传媒大学信息工程学院,北京100024

出　　处：《中国传媒大学学报（自然科学版）》2012年第2期70-74,共5页Journal of Communication University of China：Science and Technology

摘　　要：提出一种可应用于BICM-ID系统的新的停止判决算法,即新LLR停止准则,并将该准则应用于不同的调制、映射及译码方案中,进行大量的Matlab仿真,并对仿真结果进行分析研究。仿真结果发现,应用了新LLR停止准则的各种调制、映射及译码方案的误比特率性能同应用固定迭代次数的fixed方案相比几乎没有性能损失,但是却大大地减少了译码迭代次数,这就减小了BICM-ID系统接收端的译码复杂度,节省了译码时间,降低了译码功耗。This paper proposes a new stopping judgment algorithm for BICM -ID system, which is named the new LLR stopping criterion. Then, it makes a research with substantial Matlab simulations on different modulations, mappings and decoding algorithms that using the new devised LLR stopping criterion. We can find from the simulation results that there is approximately no BER （ bit - error - rate） perform- ance degradation using LLR stopping criterion compared with the scheme that using fixed iteration num- bers. However, the application of new LLR stopping criterion has greatly reduced the iteration numbers, which leads to the decreased decoding complexity and decreased time delay, and at the same time re- duces the power consumption of the receiver.

关 键 词：带迭代译码的比特交织编码调制 软输入软输出 停止准则 外部信息 先验信息 对数似然比 

分 类 号：TN921[电子电信—通信与信息系统]