Power Allocation in Multiuser MIMO Systems for Simultaneous Wireless Information and Power Transfer

Far field wireless recharging based on microwave power transfer (MPT) will release mobile terminals from interruption due to finite battery storage. Wireless energy transfer (WET), which integrating MPT with wireless communications, is a promising technology to provide perpetual energy supplies to wireless networks. In this paper, we propose a novel power allocation algorithm for Multiuser MIMO (MU MIMO) systems with simultaneous wireless information and power transfer (SIPT). For the purpose of universal relevance, a K+L+1 node network is investigated, in which K receivers decode information and the other L receivers harvest energy from the signals broadcasted by the base station. The proposed integrated scheme, based on the well-known Block Diagonalization (BD) preceding method, can completely suppress the multiuser interference and perform an outer-bound which is characterized by the boundary of the rate-energy (R-E) region as well.