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分布式MIMO中的最大似然频偏估计
邓凯
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(School of Physics and Electronic Engineering, Yibin University，Yibin 644000，China)

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。

关键词: MIMO 分布式天线频偏估计最大似然

DOI：

基金项目: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）

Maximum likelihood estimation of frequency offsets in distributed MIMO systems

DENG Kai

(宜宾学院物理与电子工程学院，四川宜宾 644000)

Abstract:

In consideration of the general case where the frequency offsets(FO) between each transmitting antenna and each receiving antenna are possibly different in d istrib uted multiinput multioutput(MIMO) systems,the maximum likelihood( ML) FO estimation in flat-fading MIMO channels is derived. Aiming at the cases w ith coloca ted and distributed receiving antennas, two lowcomplexity FO estimation method s involving only 1dimensional maximization are proposed, respectively. Simulation results show that the proposed FO estimation methods can achieve satisfactory pe rformance in flatfading MIMO channels. While in the special case where the rece iving antennas are still colocated, the estimation performance can be further improved by joint estimation using all receiving antennas.

Key words: MIMO distributed antennas frequency offset estimation maximum likelihood