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该论文提出了一款工作在71-86GHz的封装式16单元×16波束多用户波束赋形集成接收机，采用28nm CMOS工艺。它解决了大规模MIMO系统中全连接架构带来的硬件复杂度问题，实现了多用户空间复用和信道带宽重用。
high-capacity wireless access. A base-station array of M antennas simultaneously steers K independent beams, which enables spatial multiplexing and channel bandwidth reuse across multiple users. It has been shown that for M≫K (i.e. massive MIMO), linear algorithms can achieve near-optimal user tracking and spatial interference rejection [1]. The power and area demands of massive arrays are minimized with a fully connected architecture, where each beam is a combination of all available array elements [2]. However, a massive fully connected array results in significant hardware complexity. Multistage beamforming, as shown in Fig. 14.1.1, provides a scalable, modularized architecture to reduce complexity, and thus power, in massive MU-MIMO RXs [2]. The array is divided into N subarrays, and beamforming (BF) is performed in two steps. At
Emily Naviasky, Lorenzo Iotti, Greg LaCaille, Borivoje Nikolić, Elad Alon, Ali Niknejad
University of California, Berkeley, CA Multi-User MIMO (MU-MIMO) at mm-wave is a promising technique for