Achievable Rate Analysis of Simultaneous Wireless Information and Power Transfer in a Full-duplex Communication System with Massive Antenna Array

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Faculty of Engineering, Shahrekord University, Shahrekord, Iran

Abstract

We consider a multiuser wireless system with a full-duplex hybrid access point (HAP) that transmits to a set of users in the downlink channel, while receiving data from another set of energy-constrained sensors in the uplink  channel. We assume that the HAP is equipped with a massive antenna array, while all users and sensor nodes have a single antenna. We adopt a time-switching protocol where in the first phase, sensors are powered through wireless energy transfer from HAP and HAP estimates the downlink channel of the users. In the second phase, sensors use the harvested energy to transmit to the HAP.  Aassuming perfect and imperfect channel state information, we derive expressions for the achievable uplink and downlink rates in the large-antenna limit and approximate results that hold for any finite number of antennas. Based on these analytical results, we obtain the power-scaling law and  analyze the effect of the number of antennas on the cancellation of intra-user interference and the self-interference.

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