Physical layer security design method based on alternate iteration in IRS-assisted MISO system

Abstract

The invention relates to a physical layer security design method based on alternate iteration in an IRS-assisted MISO system, and belongs to the technical field of wireless communication. The method comprises the steps: constructing an objective function with non-convex constraint, wherein the objective function is composed of a beam forming vector and an intelligent reflection surface phase shift matrix, and the objective function is iteratively solved by adopting an alternating iteration thought; taking the maximizing of the secrecy rate of the system as the purpose, solving a beam forming vector by using a generalized Rayleigh entropy solving method, and then solving an intelligent reflection surface phase shift matrix by using a Dinkelbach algorithm and a Riemannian manifold-based conjugate gradient descent method. Compared with a traditional method for solving the intelligent reflection surface phase shift matrix through a semi-definite relaxation method, the method has the advantages that the operation complexity can be reduced, and the secrecy rate of a system can be increased. The method is simple in implementation process and has a better application prospect.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a physical layer security design based on Dinkelbach and Riemannian manifold optimization of an intelligent reflecting surface (Intelligent reflecting surfaces, IRS) assisted MISO communication system. Background technique [0002] Intelligent reflecting surfaces (IRS) utilize a large number of low-cost passive reflective elements to realize intelligent configuration of wireless communication environments. Therefore, IRS is expected to be widely used in future mobile communications. [0003] Specifically, the ability of smart reflective surfaces to redirect end-to-end signal propagation through low-cost passive components such as printed dipoles and phase shifters is a revolutionary new feature in any modern wireless system Neither was exploited. Furthermore, the metasurface in the form of an artificial structure can be easily embedded on the surface of building wa...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a physical layer security design method based on alternating iterations in an IRS-assisted MISO system, aiming at the problem of high design complexity of the phase shift matrix of several existing intelligent reflective surfaces, using The physical layer security design scheme combining the Dinkelbach algorithm in fractional programming and the Riemannian manifold optimization algorithm reduces computational complexity and improves system security performance

Images