Design Method of Active Intelligent Reflective Surface Assisted WPCN IoMT System

Abstract

The invention provides a design method of an active intelligent reflecting surface-assisted WPCN-IOMT system, and the method comprises the steps: constructing an active intelligent reflecting surface-assisted WPCN-IOMT system model; a wireless energy supply transmission protocol which is firstly harvested and then transmitted is provided, and the whole transmission process is planned as a wireless energy transmission stage and a wireless information transmission stage; and the optimization problem of maximizing the WPCN-IOMT system and throughput is formulated through joint optimization of reflection factors and time slot distribution of the active intelligent reflecting surface; in order to solve the non-convex optimization problem of optimization variable coupling, an optimization framework based on alternate optimization is provided; aiming at the sub-optimization problem of the reflection factors of the transmission time slot distribution and the wireless energy transmission stage, a solution based on semi- positive definite relaxation is provided; for the sub-optimization problem of the reflection factor in the wireless information transmission stage, a continuous convex approximation solution method is adopted; and iterative optimization is carried out on the two sub-optimization problems until convergence The invention can effectively improve the spectrum efficiency of the WPCN-IOMT system.

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