IRS Aided Multi-User Millimeter-Wave Communications for Coverage Enhancement

Intelligent Reflecting Surface Aided Multi-User Millimeter-Wave Communications for Coverage Enhancement

URL: http://arxiv.org/abs/1910.02398

 

Abstract

Introduce a distributed IRS aided mmW system to support multi-user transmission.

Consider multi-user interference, study a joint active and passive beamforming problem for weighted sum-rate maximization.

Algorithm: alternating iterative algorithm with closed-form expressions and quantitative projection method for the IRS with discrete phase shifts. 

 

Introduction

Passive beamforming (PBF): reflect beamforming by the phase shifters at the IRS --- 

Active beamforming (ABF): precoding operation at the base station (BS)  ---  P

 

System Model

 

Problem

 

Transformation - 1

 

Transformation - 2

 

Solution