| 分布式MIMO中的最大似然频偏估计 |
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| 引用本文： | 邓 凯. 分布式MIMO中的最大似然频偏估计[J]. 电讯技术, 2012, 52(8): 1265-1268 |
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| 作者姓名： | 邓 凯 |
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| 作者单位： | 宜宾学院物理与电子工程学院,四川宜宾,644000 |
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| 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） |
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| 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.
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| 关 键 词： | MIMO 分布式天线 频偏估计 最大似然 |
Maximum likelihood estimation of frequency offsets in distributed MIMO systems |
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| DENG Kai. Maximum likelihood estimation of frequency offsets in distributed MIMO systems[J]. Telecommunication Engineering, 2012, 52(8): 1265-1268 |
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| Authors: | DENG Kai |
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| Affiliation: | DENG Kai(School of Physics and Electronic Engineering,Yibin University,Yibin 644000,China) |
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| Abstract: | In consideration of the general case where the frequency offsets(FO) between each transmitting antenna 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-dimensional 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 receiving antennas are still co-located,the estimation performance can be further improved by joint estimation using all receiving antennas. |
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| Keywords: | MIMO distributed antennas frequency offset estimation maximum likelihood |
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