In this letter, we consider the downlink wireless energy transfer as the sole source of power to support uplink data transmission in a multiuser massive multiple-input multiple-output (MIMO) system. The asymptotically optimal closed-form downlink power allocation strategy is derived to maximize the uplink sum rate using matched filter-based beamforming. Moreover, it is interesting to find that the obtained power allocation for uplink sum rate maximization simultaneously maximizes the minimum user rate under the asymptotic massive MIMO scenario.
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Wu et al. (2015) studied this question.
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