Safe beam forming method and device based on IRS

Abstract

The invention relates to a safety beam forming method and device based on an IRS. The method comprises the steps of establishing an SWIPT Internet of Things system model based on IRS assistance; jointly optimizing a base station transmitting beam forming matrix, a jammer covariance matrix and an IRS phase shift, and constructing an optimization problem of maximized energy collection; and using a relaxation variable, a semi-definite relaxation method, an auxiliary variable and a sequence parameter convex approximation method for converting a non-convex quadratic problem into an equivalent convex problem, and providing an alternate iterative optimization algorithm for obtaining a feasible solution of an original problem. According to the invention, the IRS and a jammer are combined to establish a secret communication link of the SWIPT Internet of Things system based on IRS assistance, and the base station transmitting beam forming matrix, the jammer covariance matrix and the IRS phase shift are optimized in a combined manner, so that the communication security is improved, and the energy collection capability of the system is enhanced at the same time.

Description

technical field [0001] The invention belongs to the technical field of communications, and in particular relates to an IRS-based safe beamforming method and device. Background technique [0002] The further research and development of the sixth generation communication technology (6G) can meet the needs of the future ubiquitous Internet of things (IoT), but the architecture of 6G&IoT has resource allocation between devices, sustainable communication, and information security. And so on a series of questions. With the rapid increase of information transmission rate and the number of mobile terminals, the security and reliability of information transmission is particularly important. [0003] Simultaneous wireless information and power transfer (SWIPT) is a radio frequency energy harvesting technology, that is, wireless information and energy are transmitted at the same time. The difference from wireless power transfer is that information is transmitted while energy is intera...

AI Technical Summary

Problems solved by technology

[0002] The further research and development of the sixth generation communication technology (6G) can meet the needs of the future ubiquitous Internet of things (IoT), but the architecture of 6G&IoT has resource allocation between devices, sustainable communication, and information security. a series of questions

Most of the current work only considers the IRS-assisted SWIPT system model or mainly focuses on the traditional security transmission system, but the jammer technology that can effectively improve the security rate and energy transmission has not been studied

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