DCAP: Improving the Capacity of WiFi Networks with Distributed Cooperative Access Points - 2018


This Project presents the Distributed Cooperative Access Points (DCAP) system that may simultaneously serve multiple clients using cooperative beamforming to extend the capacity of WiFi-kind wireless networks. The distributed APs are connected by Ethernet and driven by independent low-value native oscillators. To facilitate cooperative beamforming, we tend to address three major challenges: the part synchronization, the channel state data (CSI) measurement, and the user choice. Specifically, we tend to develop one) a cooperative tracking theme to track signal part drifts at image level without adding further hardware complexity; two) an incremental CSI estimation mechanism that removes the per-frame CSI measurement overhead of previous approaches; and 3) a simple random user selection algorithm that scales the network capacity linearly and delivers over seventy percent performance compared to the optimal however advanced greedy algorithm. We have a tendency to implement DCAP on the Sora software radio platform and evaluate it in a wireless network with nine nodes. Experimental results show that the cooperative beamforming is feasible in observe, and our cooperative section tracking will guarantee strict phase alignment (= zero.03 radian) among APs throughout the complete beamforming amount (1.a pair of ms). Otherwise, without tracking, phases could drift by 0.3 radian over just 600 µs, inflicting that the symbol SNR decreases as large as twenty dB.

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