Scaling mmWave WLANs With Single RF Chain Multiuser Beamforming
Scaling mmWave WLANs With Single RF Chain Multiuser Beamforming
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DOI：
10.1109/tnet.2022.3182976
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发表时间：
2022-12
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
60 GHz Wi-Fi中的多用户传输可以通过复用多个用户数据流来实现高达100 Gbps的数据速率。然而，该方法的基本限制是每个RF链限于支持一个流或一个用户。在本文中，我们扩展多用户60 GHz的WLAN数据速率，通过克服这一限制，并提出单RF链多用户波束成形（SIMBA），一种新的框架，多流多用户下行链路传输通过一个单一的RF链。我们通过重叠星座构建单个波束成形传输，以复用多个用户的调制符号，使得不同位置的分组用户可以共享来自AP的相同发射波束。为此，我们引入用户分组和波束选择策略，跨越数据速率，训练和计算开销的权衡。我们使用软件定义无线电和商用60 GHz收发器实现了一个可编程WLAN测试平台，并使用12单元相控阵天线阵列以及具有不同波束宽度的喇叭天线收集不同室内WLAN部署的空中测量。我们表明，在比较单用户传输，SIMBA实现了$2\times $的改善，在聚合速率和两倍的延迟减少同时传输到四个用户。
Multi-user transmission in 60 GHz Wi-Fi can achieve data rates up to 100 Gbps by multiplexing multiple user data streams. However, a fundamental limit in the approach is that each RF chain is limited to supporting one stream or one user. In this paper, we scale multi-user 60 GHz WLAN data rate by overcoming this limit and propose SIngle RF chain Multi-user BeAmforming (SIMBA), a novel framework for multi-stream multi-user downlink transmission via a single RF chain. We build on single beamformed transmission via overlayed constellations to multiplex multiple users’ modulated symbols such that grouped users at different locations can share the same transmit beam from the AP. For this, we introduce user grouping and beam selection policies that span tradeoffs in data rate, training, and computation overhead. We implement a programmable WLAN testbed using software-defined radios and commercial 60 GHz transceivers and collect over-the-air measurements for different indoor WLAN deployments using a 12-element phased antenna array as well as horn antennas with varying beamwidth. We show that in comparison to single-user transmissions, SIMBA achieves $2\times $ improvement in aggregate rate and two-fold delay reduction for simultaneous transmission to four users.