Transceiver Design for Simultaneous Wireless Information and Power Multicast in Multi-User mmWave MIMO System

Millimetre wave (mmWave) has a range of merits for both wireless information and power transfer, such as high-bandwidth for high-throughput, massive antennas for efficient signal transmission, highly directional beams for overcoming channel attenuations and high degree of freedom for signal processing. Therefore, we investigate transceiver design in a multi-user mmWave MIMO system for simultaneous wireless information and power multicast (SWIPM). First of all, we obtain the asymptotically optimal solution include full-digital solutions for the transmitter and information users (IUs) as well as analog solutions for energy users (EUs) in the mmWave MIMO aided transceivers. It maximizes information multicast spectral efficiency of IUs, while satisfying individual wireless charging requirement of EUs. Then, based on this asymptotically optimal solution, hybrid beamformer at a transmitter and signal combiners at IUs are jointly designed with the same objective, when considering low hardware complexity (e.g. limited number of RF chains and low-resolution phase shifters). A low-complexity algorithm is developed for solving the resultant constraint max-min problem. Additionally, we also demonstrate a practical multi-antenna aided receiver architecture of EUs by considering practical non-linear energy harvesters. Numerical results validate the advantage of our joint transceiver design for SWIPM.