# Distortion-Aware Linear Precoding for Millimeter-Wave Multiuser MISO Downlink

## TL;DR

This paper introduces an iterative, distortion-aware linear precoding scheme for millimeter-wave multiuser MISO downlink systems, accounting for hardware impairments like nonlinear power amplifiers to improve sum rate performance.

## Contribution

It develops a novel precoding method that incorporates hardware impairments using Bussgang's theorem and demonstrates its effectiveness through numerical simulations.

## Key findings

- The proposed scheme improves sum rate in the presence of hardware impairments.
- It effectively models nonlinear power amplifier effects in millimeter-wave channels.
- Numerical results show significant performance gains over traditional methods.

## Abstract

In this work, we propose an iterative scheme for computing a linear precoder that takes into account the impact of hardware impairments in the multiuser multiple-input single-output downlink. We particularly focus on the case when the transmitter is equipped with nonlinear power amplifiers. Using Bussgang's theorem, we formulate a lower bound on the achievable sum rate in the presence of hardware impairments, and maximize it using projected gradient ascent. We provide numerical examples that demonstrate the efficacy of the proposed distortion-aware scheme for precoding over a millimeter-wave~channel.