MIMO-OFDM系统自适应排序K-best检测器研究  

Research of an adaptive sorted K-best detector for MIMO-OFDM system

作　　者：朱勇旭[1] 吴斌[1] 周玉梅[1] 石殊[1] 

机构地区：[1]中国科学院微电子研究所,北京100029

出　　处：《重庆邮电大学学报（自然科学版）》2011年第2期135-139,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家科技重大专项(2009ZX03007-002);国家自然科学基金(60976022)~~

摘　　要：针对IEEE 802.11n MIMO-OFDM系统提出一种基于相干带宽估计的自适应排序K-best检测器(adaptivesorted K-best detector,ASK-best)。通过皮尔逊相关系数(Pearson correlation coefficient)对相干带宽进行估计,据此将频带有效子载波划分为多个子带,对子带内子载波实施相同排序K-best检测。该改进可逼近基于每个子载波排序的全排序K-best检测性能,同时能根据信道相干带宽估计量自适应调整子载波排序次数。20 MHz带宽(56个有效子载波)和4×4天线配置条件下,相比全排序K-best 56次排序,在TGn单径平坦衰落信道A下,ASK-best自适应调整排序次数为1,14径多经衰落信道C下,ASK-best不超过8次排序就可达到全排序K-best性能。An adaptive sorted K-best detector（ASK-best）based on estimation of coherence bandwidth is proposed for IEEE 802.11n system.The valid subcarriers are divided into several sub-bands according to coherence bandwidth estimated by Pearson Correlation Coefficient,and the corresponding valid subcarriers in each sub-band are processed by the identical sorted K-best detector.It is proved that the proposed algorithm can provide system performance close to all sorted K-best imposing on each subcarrier.Meanwhile the times of sort can be adaptive according to estimation of coherence bandwidth.In the configuration of 20 MHz bandwidth（56 valid subcarriers）and 4×4 multiple input multiple output（MIMO）,compared to 56 times of sort in all sorted K-best,while ASK-best provides the performance close to all sorted K-best,the times of sort are one in flat channel fading of TGn channel A,and about 8 in multipath channel fading of TGn channel C.

关 键 词：IEEE802.11N MIMO-OFDM K-best 自适应排序 

分 类 号：TN914[电子电信—通信与信息系统]