IRS-aided cognitive swipt system beamforming method

By applying a robust beamforming design method with block coordinate descent to the cognitive SWIPT system, the parameters of the secondary user transmitter and smart reflector are optimized, solving the transmission problem of the secondary user receiver under channel uncertainty, and achieving a reduction in transmission power and an improvement in energy harvesting efficiency.

CN116192218BActive Publication Date: 2026-03-24CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-24
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

Existing technologies fail to effectively consider power-splitting architectures for secondary user receivers under non-ideal channel state information conditions, and fail to optimize the spectrum and energy harvesting efficiency of smart reflector-assisted cognitive SWIPT systems.

Method used

A robust beamforming design method based on block coordinate descent is proposed. By using the triangle inequality, Schur Complement and the generalized S-Procedure method, the non-convex optimization problem is transformed into a convex optimization problem. The method optimizes the transmit beam, power division coefficient and phase shift of the smart reflector of the secondary user transmitter, taking into account channel uncertainty and various constraints.

Benefits of technology

This effectively reduced the transmission power for secondary users, improved energy harvesting efficiency, and enhanced system performance.

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Abstract

The present application relates to a kind of intelligent reflecting surface IRS assisted cognitive wireless power transfer communication SWIPT system beamforming method, belong to wireless communication field.The method includes: S1: the IRS assisted cognitive SWIPT system scene transmission model is established.S2: with the minimum transmission power of secondary user transmitter as objective function, considering the minimum signal-to-noise ratio constraint of secondary user, power splitting coefficient and minimum energy collection constraint, intelligent reflecting surface phase shift constraint and the interference noise ratio threshold constraint of primary user, based on channel uncertainty, a joint optimization secondary user transmitter beam design, secondary user power splitting coefficient and intelligent reflecting surface phase shift design resource allocation model is established.S3: the non-convex problem with infinite constraints is converted into finite-dimensional deterministic convex optimization problem.S4: it is solved by converting into semi-definite programming problem.S5: for IRS phase shift design subproblem, penalty concave-convex process method is used to solve.
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Citation Information

Patent Citations

  • Performance optimization method for cognitive simultaneous wireless information and power transfer network assisted by intelligent reflecting surface

    CN114221724A

  • Primary and secondary frequency spectrum sharing method for intelligent reflector-assisted simultaneous wireless information and power transfer cognition

    CN115460612A