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On the Outage of Wireless Powered Communications with Spatially Random Sensors

This paper analytically investigates the performance of a wireless powered communication system, where multiple sensors powered by multiple dedicated power beacons (PBs) communicate with an access point. Specifically, we consider a harvest-then-transmit multiple-input multiple-output (MIMO) communication system, where in each time frame, the sensors first collect energy from the surrounding PBs, and the sensor with the highest signal-to-interference ratio (SIR) to the access point is scheduled according to opportunistic scheduling strategy. The locations of PBs, sensors and interferers are characterized by stochastic geometry tools. Under this architecture, the outage probability of information transmission is investigated, assuming the CCI can be approximated by a Gamma distributed variable. Numerical results validate the analysis and show the impacts of the density and transmit power of terminals on the system performance.