System backward link optimization method and system combining IRS and wireless power supply

The invention relates to the technical field of 6G wireless communication networks, and discloses an IRS and wireless power supply combined system backward link optimization method and system, and the method comprises the steps: S1, a base station transmits a main link signal to an intelligent reflection surface and a plurality of clusters, and the intelligent reflection surface reflects and forwards the main link signal to the plurality of clusters, each cluster comprises a receiver and a plurality of BD devices; s2, the multiple BD devices modulate and transmit respective Internet of Things information to the corresponding receivers by taking the received main link signals as carriers in the corresponding time slots, the time slots are divided into two stages during transmission, the BD devices perform passive backscattering transmission in the first stage, and meanwhile, energy is collected by adopting a wireless power supply technology, and the BD devices perform passive backscattering transmission in the