Abstract
In this study, the authors consider the simultaneous wireless information and power transfer (SWIPT) protocol design for the massive multiple-input multiple-output (MIMO) system in the beam-domain. In this system, the base station (BS) simultaneously serves a set of half-duplex energy-constrained terminals that are uniformly distributed within its coverage area. Based on the beam-domain distributions of channels, the BS can intelligently schedule terminals to mitigate the interference between terminals and improve the transmission spectral efficiency. The entire protocol can be divided into two phases. The first phase is designed for terminals energy harvesting as well as downlink training. During this phase, the BS transmits energy signals to the terminals. The terminals utilise the received energy signals for energy harvesting and downlink channel estimation. In the second phase, the BS forms the receive beamformers to receive signals transmitted by terminals. The transmit powers at the BS and the time switching ratio are optimised under the constraints of the current available energy and minimum transmission rate of terminals, so that the system can achieve the maximum sum-rate performance. Simulation results show that compared with traditional massive MIMO SWIPT protocols, the proposed SWIPT protocol can achieve better spectral efficiency performance.
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