FALP: Fast Beam Alignment in mmWave Systems With Low-Resolution Phase Shifters
FALP: Fast Beam Alignment in mmWave Systems With Low-Resolution Phase Shifters
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DOI：
10.1109/tcomm.2019.2941490
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发表时间：
2019-02
影响因子：
8.3
通讯作者：
Nitin Jonathan Myers;A. Mezghani;R. Heath
中科院分区：
文献类型：
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作者：
Nitin Jonathan Myers;A. Mezghani;R. Heath
毫米波（mmWave）系统若能妥善配置发射与接收无线电设备之间的链路，便可实现高数据速率。然而，由于使用大型天线阵列以及存在硬件限制，毫米波链路的快速配置颇具挑战性。例如，在典型的毫米波相控阵中，基于穷举搜索的波束对准会产生大量训练开销。在本文中，我们提出了一个名为FALP（基于低分辨率移相器的快速波束对准）的框架。FALP使用一组高效的天线权重向量来获取信道测量值，与穷举扫描相比，能实现更快的波束对准。FALP中的天线权重向量可在超低功耗移相器中实现，其分辨率可低至1比特。从压缩感知（CS）的角度来看，FALP中设计的CS矩阵满足受限等距性，且允许CS算法利用快速傅里叶变换。所提出的框架还在相控阵信道采集与磁共振成像之间建立了新的联系。
Millimeter wave (mmWave) systems can enable high data rates if the link between the transmitting and receiving radios is configured properly. Fast configuration of mmWave links, however, is challenging due to the use of large antenna arrays and hardware constraints. For example, a large amount of training overhead is incurred by exhaustive search-based beam alignment in typical mmWave phased arrays. In this paper, we present a framework called FALP for Fast beam Alignment with Low-resolution Phase shifters. FALP uses an efficient set of antenna weight vectors to acquire channel measurements, and allows faster beam alignment when compared to exhaustive scan. The antenna weight vectors in FALP can be realized in ultra-low power phase shifters whose resolution can be as low as one-bit. From a compressed sensing (CS) perspective, the CS matrix designed in FALP satisfies the restricted isometry property and allows CS algorithms to exploit the fast Fourier transform. The proposed framework also establishes a new connection between channel acquisition in phased arrays and magnetic resonance imaging.