Abstract

In the opportunistic beamforming (OBF) scheme, the access point (AP) acquires channel related feedback from the network's terminals and allocates the orthonormal beams to the users with the best link. This paper investigates the OBF scheme in a wireless powered communication network, where multi-antenna terminals with wireless power harvesting capabilities are randomly deployed around the AP. In this context, the terminals adapt the length of their feedback based on the power harvested with the use of rectenna arrays. We study two fundamental architectures for the combination of the rectenna elements, the direct-current combiner and the radio-frequency combiner, as well as a hybrid architecture of these two. By using higher order statistics and stochastic geometry, the beam outage probability is derived in closed form for all considered architectures.

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