An energy harvesting fairness maximisation for active/passive IRS-assisted PS-SWIPT system

In this study, broadcast power-splitting simultaneous wireless information and power transfer (SWIPT) assisted by active/passive intelligent reflecting surface (IRS) is investigated to enhance the harvested energy of receivers under the constraints of data rate and limited transmission powers. The maximisation of minimum harvested energy is investigated by jointly optimising the beamforming vector and power-splitting (PS) factors at the transmitter and the receivers, the amplification factors, and/or the phase shifts at the active/passive IRS. The alternating optimisation, successive convex approximations, and feasible point pursuit methods cooperate to find the near-optimal solution. Finally, the numerical simulation presents the convergence and effectiveness of the proposed algorithm.