SIMBA: Single RF Chain Multi-User Beamforming in 60 GHz WLANs
SIMBA: Single RF Chain Multi-User Beamforming in 60 GHz WLANs
复制标题
DOI：
10.1109/infocom41043.2020.9155441
复制
发表时间：
2020-07
期刊：
影响因子：
--
通讯作者：
Keerthi Priya Dasala;J. Jornet;E. Knightly
中科院分区：
文献类型：
--
作者：
Keerthi Priya Dasala;J. Jornet;E. Knightly
60 GHz Wi-Fi中的多用户传输通过对多个用户数据流进行多路复用，可以实现高达100 Gbps的数据速率。然而，该方法的一个基本限制是每个RF链仅限于支持一个流或一个用户。为了克服这一限制，我们提出了单射频链多用户波束成形（SIMBA），这是一种通过单射频链进行多流多用户下行传输的新框架。我们通过叠加星座建立单波束形成传输，以复用多个用户的调制符号，使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，我们引入了用户分组和波束选择策略，这些策略跨越了数据速率、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收发器实现可编程WLAN测试平台，并使用不同波束宽度的相控阵天线和喇叭天线收集空中测量数据。我们发现，与单用户传输相比，SIMBA在同时传输到4个用户时，聚合速率提高了2倍，延迟降低了2倍。
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.