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Opportunistic Channel Estimation for Implicit 802.11af MU-MIMO

机译：隐式802.11af MU-MIMO的机会信道估计

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摘要

Multi-User MIMO (MU-MIMO) linear channel coding can greatly increase wireless system capacity when Stations (STAs) have fewer antennas than the Access Point (AP), but it comes at the cost of significant Channel State Information (CSI) estimation overhead. Previous work has suggested that 802.11af MU-MIMO systems might benefit from long channel coherence time, extending the useful duration of CSI. In this paper, we propose and analyze an opportunistic channel sounding policy that avoids sounding overhead in wireless channels by gathering implicit CSI opportunistically. This policy not only avoids CSI overhead, but also has the potential to enable efficient interoperability of multi-user APs with legacy single-stream STAs. To investigate the performance of this new policy, we implement a new mobile channel sounding framework on a custom 802.11af Software-Defined Radio (SDR) system designed for UHF-band experimentation and evaluate channel sounding performance in indoor and outdoor environments under various mobility modes. Additional protocol analysis shows that in UHF channels with sufficient channel coherence time, an opportunistic channel sounding policy offers significant protocol optimization while improving the scalability of next-generation MU-MIMO systems.
机译：当站点（STA）的天线比接入点（AP）少时，多用户MIMO（MU-MIMO）线性信道编码可以极大地增加无线系统的容量，但这要付出大量信道状态信息（CSI）估计开销的代价。先前的工作表明，802.11af MU-MIMO系统可能会受益于较长的信道一致性时间，从而延长了CSI的有效期限。在本文中，我们提出并分析了机会信道探测策略，该策略通过机会性地收集隐式CSI来避免无线信道中的探测开销。该策略不仅避免了CSI开销，而且还具有实现多用户AP与旧式单流STA高效互操作的潜力。为了研究这项新政策的性能，我们在专为UHF频段实验设计的定制802.11af软件定义无线电（SDR）系统上实施了新的移动信道探测框架，并评估了各种移动性模式下室内和室外环境中的信道探测性能。额外的协议分析表明，在具有足够信道相干时间的UHF信道中，机会信道探测策略可提供显着的协议优化功能，同时还可改善下一代MU-MIMO系统的可扩展性。

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