自适应TDD MIMO-OFDM系统中一种补偿干扰不对称的改进方法  

Improved method of compensating non-reciprocal interference in adaptive TDD MIMO-OFDM systems

作　　者：曾端阳[1] 宋荣方[1,2] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2009年第4期106-112,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(60572130);东南大学移动通信国家重点实验室开放课题基金资助项目(N200809);江苏省青蓝工程基金资助项目;江苏省高校自然科学研究计划重点资助项目(08KJD510001);国家教育部博士点基金资助项目(20080293004);国家重点基础研究计划(“973”计划)基金资助项目(2007CB310607)~~

摘　　要：在时分双工(TDD)系统中,由于信道的对称性,发射端无需通过反馈即能得到信道状态信息,并可以用来显著提高多输入多输出(MIMO)系统的频谱利用率。但是,上下行的干扰结构根本不相关。如果上下行干扰差别很大,利用反向测量决定的调制编码参数可能导致较大的误帧率。提出一种发射端能动态跟踪接收端实际干扰值简单的闭环反馈干扰自适应新方法,并研究其在具有HARQ的自适应TDD MIMO-OFDM系统中的性能。仿真结果表明,干扰估计值能很好地跟踪实际值,系统能始终满足误帧率指标要求。In a time division duplex （TDD） system, the channel state information could be easily obtained at the transmitter side without feedback due to channel reciprocity and it could be used to increase dramatically the spectral eff ciency of a multi-input multi-output （MIMO） system. However, the interference structure between transmission directions did not necessarily correlate at all. In such a case, the downlink modulation/coding parameters based on the uplink measurements might lead to excessively high frame error rates （FER）. Therefore, a simple closed-loop feedback method of in- terference adaptation was proposed, which made the transmit-side estimated interference be able to track the instantaneous receive-side interference dynamically, and its performance in adaptive TDD MIMO-OFDM systems with HARQ was studied. Simulation results show that the tracking performance is well and the target FER requirement can be guaranteed.

关 键 词：时分双工 多输入多输出 正交频分复用 自适应调制编码 混合自动重发请求 闭环反馈 

分 类 号：TN929.5[电子电信—通信与信息系统]