摘要
针对Turbo均衡中接收机过多迭代次数造成的数据处理延时大的问题,在研究MAP均衡器和译码器输出外信息统计特性的基础上,得到它们的输出外信息具有近似高斯分布的特性,提出基于外信息统计量的2个迭代停止准则。通过判断相邻迭代的外信息统计量比值大小,来实现动态调整迭代均衡次数,给出了这2个停止准则的仿真结果,在性能损失很小的情况下,有效地减小了延时,降低了复杂度。
Aiming at the problem of large data processing delay caused by the excessive iterative number in Turbo equalization receiver,this paper studies the statistic characteristics of extrinsic information from MAP equalizer and decoder and determines that the extrinsic information has the characteristic of approximate Gaussian distribution. Based on this study,it proposes two stop criteria based on the extrinsic information statistics. By determining the ratio of adjacent iterative extrinsic information statistics, the iterative number is adjusted dynamically. The simulation results of the two stop criteria show that these two stop criteria can effectively decrease the time delay and the complexity under the condition of small performance degradation.
出处
《无线电通信技术》
2014年第1期37-40,共4页
Radio Communications Technology
关键词
TURBO均衡
外信息
停止准则
复杂度
turbo equalization
extrinsic information
stop criterion
complexity
