Uplink Multi-User Beamforming on Single RF Chain mmWave WLANs
Uplink Multi-User Beamforming on Single RF Chain mmWave WLANs
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DOI：
10.1109/infocom42981.2021.9488826
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
Keerthi Priya Dasala;J. Jornet;E. Knightly
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文献类型：
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作者：
Keerthi Priya Dasala;J. Jornet;E. Knightly
当今的毫米波WLAN可以仅在下行链路上实现同时多用户多流传输。在本文中，我们提出了上行链路多用户波束形成单RF链AP（UMBRA），一种新的框架，通过一个单一的RF链支持多流多用户上行链路传输。我们设计了多用户重叠星座和多用户接收机机制，以实现在单个RF链AP上接收的并发时间触发上行链路多用户传输。我们设计了示例性波束选择策略，以联合调整用户和AP处的波束，以实现聚合速率最大化，而不增加与单用户系统相比的训练要求。我们使用可编程WLAN测试平台，使用软件定义的无线电和商用60 GHz收发器实现UMBRA的关键组件，并使用相控阵天线和具有不同波束宽度的喇叭天线收集空中测量。我们发现，与单用户传输相比，UMBRA实现了超过1.45倍的总速率的提高，而不管用户组的选择，几何分离，和接收器波束宽度。
Today’s mmWave WLANs can realize simultaneous multi-user multi-stream transmission solely on the downlink. In this paper, we present Uplink Multi-user Beamforming on single RF chain AP (UMBRA), a novel framework for supporting multi-stream multi-user uplink transmissions via a single RF chain. We design multi-user overlayed constellations and multi-user receiver mechanisms to enable concurrent time-triggered uplink multi-user transmissions received on a single RF chain AP. We devise exemplary beam selection policies to jointly adapt beams at users and the AP for targeting aggregate rate maximization without increasing training requirements compared to single-user systems. We implement the key components of UMBRA using a programmable WLAN testbed using software-defined radios and commercial 60-GHz transceivers and collect over-the-air measurements using phased-array antennas and horn antennas with varying beamwidth. We find that in comparison to single-user transmissions, UMBRA achieves more than 1.45× improvement in aggregate rate regardless of the choice of the user group, geometric separation, and receiver beamwidth.