Channel Estimation for Millimeter-Wave MIMO Communications With Lens Antenna Arrays
Channel Estimation for Millimeter-Wave MIMO Communications With Lens Antenna Arrays
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DOI：
10.1109/tvt.2017.2779828
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发表时间：
2018-04
影响因子：
6.8
通讯作者：
Lu Yang;Yong Zeng;Rui Zhang
中科院分区：
文献类型：
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作者：
Lu Yang;Yong Zeng;Rui Zhang
毫米波通信是未来无线通信系统的一种很有前途的技术。通过使用先进的透镜天线阵列，毫米波透镜多输入多输出(MIMO)系统显著减少了所需的射频(RF)链的数量，从而实现了具有成本效益的实现。针对有限射频链的毫米波透镜MIMO系统，提出了一种新的信道估计方案。该方案适用于一般的毫米波MIMO通信，无论是窄带还是宽带、时分双工还是频分双工。利用透镜阵列的能量聚焦特性，结合毫米波信道的多径稀疏性，所提出的信道估计方案只需要低复杂度的基于能量的双向天线选择和减小尺寸的MIMO信道估计。数值结果表明，在有限射频链的情况下，考虑到信道训练开销和不完全估计，提出的Lens MIMO系统比传统的均匀平面阵列和MIMO-orthogonal-frequency-division-multiplexing-based传输的更复杂的基准系统获得了显著更高的吞吐量。
Millimeter-wave (mmWave) communication is a promising technology for future wireless communication systems. By utilizing the advanced lens antenna arrays, a mmWave lens multiple-input multiple-output (MIMO) system significantly reduces the number of radio-frequency (RF) chains required, and thus, achieves cost-effective implementation. In this paper, we propose a novel channel estimation scheme for the mmWave lens MIMO system with limited RF chains. The proposed scheme is applicable for the general mmWave MIMO communications, regardless of narrow-band or wide-band, time-division-duplexing or frequency-division-duplexing operations. By exploiting the energy-focusing property of lens arrays, jointly with the multipath sparsity of mmWave channels, the proposed channel estimation scheme requires only low-complexity two-way energy-based antenna selections and reduced-size MIMO channel estimation. Numerical results show that under limited RF chains and taking the channel training overhead and imperfect estimation into account, the proposed lens MIMO system achieves significantly higher throughput compared to the more complex benchmark system with the conventional uniform planar array and MIMO-orthogonal-frequency-division-multiplexing-based transmissions.