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SIMBA: Single RF Chain Multi-User Beamforming in 60 GHz WLANs

机译:SIMBA:60 GHz WLAN中的单射频链多用户波束成形

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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. To overcome this limit, we propose SIngle RF chain Multiuser 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 using phased array antennas and horn antennas with varying beamwidth. We find that in comparison to single user transmissions, SIMBA achieves 2× improvement in aggregate rate and two-fold delay reduction for simultaneous transmission to four users.
机译:60 GHz Wi-Fi中的多用户传输可以通过多路复用多个用户数据流来实现高达100 Gbps的数据速率。然而,该方法中的基本限制是每个RF链限制为支持一个流或一个用户。为了克服这一限制,我们提出了单个RF链多用户波束形成(SIMBA),通过单个RF链进行多流多用户下行链路传输的新框架。我们通过覆盖的星座构建单个波束成形传输,以多路复用多个用户的调制符号,使得不同位置处的分组用户可以共享来自AP的相同的发送波束。为此,我们介绍了跨越数据速率,培训和计算开销的权衡的用户分组和光束选择策略。我们使用软件定义的无线电和商业60-GHz收发器实现了一个可编程WLAN测试设备,并使用相位阵列天线和具有不同波束宽度的喇叭天线收集空气测量。我们发现与单用户传输相比,SIMBA实现了2×汇率率的提高和两倍的延迟减少,以便同时传输到四个用户。

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