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RF energy harvesting is a promising potential solution to provide convenientand perpetual energy supplies to low-power wireless sensor networks. In thispaper, we investigate the energy harvesting performance of a wireless sensornode powered by harvesting RF energy from existing multiuser MIMO system.Specifically, we propose a random unitary beamforming (RUB) based cooperativebeam selection scheme to enhance the energy harvesting performance at thesensor. Under a constant total transmission power constraint, the multiuserMIMO system tries to select a maximal number of active beams for datatransmission, while satisfying the energy harvesting requirement at the sensor.We derive the exact closed-form expression for the distribution function ofharvested energy in a coherence time over Rayleigh fading channels. We furtherinvestigate the performance tradeoff of the average harvested energy at thesensor versus the sum-rate of the multiuser MIMO system.

Improved Performance of RF Energy Powered Wireless Sensor Node with Cooperative Beam Selection