Robust beam forming method for intelligent reflector-assisted multi-cell coordinated multi-point transmission

Abstract

The invention relates to a robust beam forming method for intelligent reflector-assisted multi-cell coordinated multipoint transmission, which comprises the following steps: firstly, constructing a joint optimization problem of base station transmitting beam forming and intelligent reflector shift by adopting a bounded error model, simultaneously satisfying base station power constraint and user rate constraint, and minimizing total transmitting power; then, decoupling the problem into two problems of base station transmitting beam forming and intelligent reflecting surface shifting, converting the base station beam forming problem into a convex optimization problem by adopting an S-Procedure theorem and convex semi-definite relaxation, converting the intelligent reflecting surface shifting problem into an optimization problem with a clear target, and providing an algorithm based on a dichotomy; and finally, alternately iterating the transmitting beamforming problem and the phase shift problem until the optimization target is converged. According to the method, the total transmitting power can be minimized under the condition that the base station power constraint and the user target rate constraint are met, and the system performance can still be ensured even under the worst channel estimation condition.

Description

technical field [0001] The invention relates to a robust beamforming method, in particular to a robust beamforming method for multi-cell cooperative multipoint transmission assisted by an intelligent reflecting surface, and belongs to the technical field of wireless communication. Background technique [0002] Intelligent Reflecting Surface (IRS) is a two-dimensional surface composed of programmable electromagnetic metamaterials, covered with a large number of passive reflectors; reflectors have a special physical structure, which can be manipulated by manual programming The phase of the incident electromagnetic wave is adjusted. Utilizing the above characteristics, IRS can construct a smart radio propagation environment, and artificially modify the natural electromagnetic wave propagation environment by adjusting the parameters of the reflecting surface, thereby eliminating unfavorable channel factors such as blocking and fading, and improving the performance of the mobile ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the IRS assisted multi-cell JP-CoMP system has channel estimation errors, which lead to system performance degradation. Robust Beamforming Method for BS-IRS Joint Transmission in CoMP System

Images