Millimeter Wave MIMO With Lens Antenna Array: A New Path Division Multiplexing Paradigm
Millimeter Wave MIMO With Lens Antenna Array: A New Path Division Multiplexing Paradigm
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DOI：
10.1109/tcomm.2016.2533490
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发表时间：
2016-04-01
影响因子：
8.3
通讯作者：
Zhang, Rui
中科院分区：
文献类型：
--
作者：
Zeng, Yong;Zhang, Rui
毫米波（mmWave）通信是用于未来无线系统的有前途的技术，而一个实际挑战是仅用有限的射频（RF）链实现其大天线增益以用于成本有效的实现。为此，我们在本文中研究了一种新的透镜天线阵列使毫米波多输入多输出（MIMO）通信系统。我们首先表明，透镜天线阵列的阵列响应遵循“sinc”函数，其中具有峰值响应的天线元件由接收/发送信号的到达角（AoA）/离开角（AoD）确定。通过利用这种独特的属性沿着与毫米波信道的多径稀疏性，我们提出了一种新的低成本和容量实现的空间复用方案的窄带和宽带毫米波通信，称为路径分割复用（PDM），其中并行数据流通过不同的传播路径与简单的每路径处理传输。我们进一步提出了一个简单的路径分组技术与基于组的小规模MIMO处理，以有效地减轻流间干扰，由于类似的AoA/AoD。数值结果提供的性能比较所提出的毫米波透镜MIMO对传统的MIMO均匀平面阵列（UPA）和混合模拟/数字处理。结果表明，所提出的设计实现了显着的吞吐量增益以及复杂性和成本降低，从而为毫米波MIMO通信带来了一个有前途的新范例。
Millimeter wave (mmWave) communication is a promising technology for future wireless systems, while one practical challenge is to achieve its large-antenna gains with only limited radio frequency (RF) chains for cost-effective implementation. To this end, we study in this paper a new lens antenna array enabled mmWave multiple-input multiple-output (MIMO) communication system. We first show that the array response of lens antenna arrays follows a "sinc" function, where the antenna element with the peak response is determined by the angle of arrival (AoA)/departure (AoD) of the received/transmitted signal. By exploiting this unique property along with the multi-path sparsity of mmWave channels, we propose a novel low-cost and capacity-achieving spatial multiplexing scheme for both narrow-band and wide-band mmWave communications, termed path division multiplexing (PDM), where parallel data streams are transmitted over different propagation paths with simple per-path processing. We further propose a simple path grouping technique with group-based small-scale MIMO processing to effectively mitigate the inter-stream interference due to similar AoAs/AoDs. Numerical results are provided to compare the performance of the proposed mmWave lens MIMO against the conventional MIMO with uniform planar arrays (UPAs) and hybrid analog/digital processing. It is shown that the proposed design achieves significant throughput gains as well as complexity and cost reductions, thus leading to a promising new paradigm for mmWave MIMO communications.