分布式MIMO中的最大似然频偏估计  

Maximum Likelihood Estimation of Frequency Offsets in Distributed MIMO Systems

作　　者：邓凯[1] 

机构地区：[1]宜宾学院物理与电子工程学院,四川宜宾644000

出　　处：《电讯技术》2012年第8期1265-1268,共4页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(61201266);宜宾学院博士科研启动金项目(2011B09)~~

摘　　要：在考虑分布式多入多出(MIMO)系统中各收发天线对之间的频偏均可能不同的一般情况下,推导出了平坦衰落MIMO信道模型下的最大似然频偏估计。针对收端是否采用分布式天线的两种不同情况,分别提出了一种只涉及一维最大化问题的较低复杂度频偏估计方法。仿真结果表明,所提频偏估计方法在平坦衰落MIMO信道下可以获得令人满意的估计性能;而在收端仍采用集中式天线这一特殊情况下,利用所有接收天线上的接收信号进行联合估计,可以进一步提高估计性能。In consideration of the general case where the frequency offsets（FO） between each transmitting anten- na and each receiving antenna are possibly different in distributed multi-input multi-output（MIMO） systems, the maximum likelihood（ML） FO estimation in flat - fading MIMO channels is derived. Aiming at the cases with co- located and distributed receiving antennas, two low-complexity FO estimation methods involving only 1-dimen- sional maximization are proposed, respectively. Simulation results show that the proposed FO estimation methods can achieve satisfactory performance in flat-fading MIMO channels. While in the special case where the receiv- ing antennas are still co-located, the estimation performance can be further improved by joint estimation using all receiving antennas.

关 键 词：MIMO 分布式天线 频偏估计 最大似然 

分 类 号：TN914[电子电信—通信与信息系统]