Effects of channel aging in massive MIMO systems
Effects of channel aging in massive MIMO systems
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DOI：
10.1109/jcn.2013.000065
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发表时间：
2013-05
影响因子：
3.6
通讯作者：
K. Truong;R. Heath
中科院分区：
文献类型：
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作者：
K. Truong;R. Heath
多输入多输出(MIMO)通信可以通过在基站部署非常大量的天线单元来提供高频谱效率。大规模MIMO通信的收益来自于在上行链路和下行链路上使用多用户MIMO，但与所服务的用户数量相比，基站处的天线大量过剩。关于大规模MIMO的初步工作没有完全解决与其部署有关的几个实际问题。研究了信道老化对海量MIMO系统性能的影响。假设发射机处的信道时间变化的简单模型，则将信道变化的影响表征为不同系统参数的函数。提出了一种克服信道老化效应的信道预测方法。对老化的分析结果显示了由于信道中的时间变化而造成的容量损失。在多层网络中的数值结果表明，即使存在一定的信道变化，大规模MIMO也可以工作，并且信道预测可以部分地克服信道老化的影响。
Multiple-input multiple-output (MIMO) communication may provide high spectral efficiency through the deployment of a very large number of antenna elements at the base stations. The gains from massive MIMO communication come from the use of multiuser MIMO on the uplink and downlink, but with a large excess of antennas at the base station compared to the number of served users. Initial work on massive MIMO did not fully address several practical issues associated with its deployment. This paper considers the impact of channel aging on the performance of massive MIMO systems. The effects of channel variation are characterized as a function of different system parameters assuming a simple model for the channel time variations at the transmitter. Channel prediction is proposed to overcome channel aging effects. The analytical results on aging show how capacity is lost due to time variation in the channel. Numerical results in a multiceli network show that massive MIMO works even with some channel variation and that channel prediction could partially overcome channel aging effects.