Uplink MU-MIMO in Asynchronous Wireless LANs
Uplink MU-MIMO in Asynchronous Wireless LANs
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DOI：
10.1145/3209582.3209585
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Huacheng Zeng;Hongxiang Li;Qiben Yan
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文献类型：
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作者：
Huacheng Zeng;Hongxiang Li;Qiben Yan
在无线LAN（WLAN）中，用户设备之间的网络时间和频率同步被认为是上行链接MU-MIMO的必要条件，因此，在802.11ax中启用上行链路MU-MIMO，专用的MAC协议（例如，触发器框架和时间范围的交流）也仅在actrone设备中提出了同步范围。开销。在本文中，我们表明用户设备之间的时间和频率是上行链路MU-MIMO的必要条件。我们在USPR2-GNURADIO测试床上的上行MU-MIMO解决方案表明，使用新的PHY，M-Antenna AP可以成功地解释来自M异步用户设备的同时信号（2≤M≤4）。
In wireless LANs (WLANs), network-wide time and frequency synchronization among user devices is widely regarded as a necessity for uplink MU-MIMO. Therefore, to enable uplink MU-MIMO in 802.11ax, dedicated MAC protocols (e.g., trigger frame and timing advance mechanism) have been proposed to synchronize user devices in the time and frequency domains. Such MAC protocols increase not only network complexity but also communication overhead. In this paper, we show that the time and frequency synchronization among user devices is not a necessity for uplink MU-MIMO. We propose a practical uplink MU-MIMO solution which does not require time and frequency alignments of the signals from user devices. The key component in our solution is a new PHY design for AP's receiver, which can decode the concurrent signals from multiple asynchronous user devices. We have built a prototype of our uplink MU-MIMO solution on USPR2-GNURadio testbed. Experimental results show that, using the new PHY, an M-antenna AP can successfully decode the concurrent signals from M asynchronous user devices (2 ≤ M ≤ 4).