# Coordinated Hybrid Precoding for Interference Exploitation in Heterogeneous Networks

## TL;DR

This paper introduces a coordinated hybrid precoding method for multiuser massive MIMO systems in heterogeneous networks, exploiting interference to improve energy efficiency and reduce transmit power.

## Contribution

It proposes a novel coordinated hybrid precoding technique and a low-complexity scheme, enhancing energy efficiency by leveraging interference rather than mitigating it.

## Key findings

- Proposed precoding outperforms conventional schemes in simulations.
- Coordination reduces total transmit power.
- Low-complexity scheme achieves near-optimal performance.

## Abstract

We consider a downlink multiuser massive MIMO system comprising multiple heterogeneous base stations with hybrid precoding architectures. To enhance the energy efficiency of the network, we propose a novel coordinated hybrid precoding technique, where the coordination between the base stations is aimed at exploiting interference as opposed to mitigating it as per conventional approaches. We formulate an optimization problem to compute the coordinated hybrid precoders that minimize the total transmit power while fulfilling the required quality of service at each user. Furthermore, we devise a low-complexity suboptimal precoding scheme to compute approximate solutions of the precoding problem. The simulation results reveal that the proposed coordinated hybrid precoding yields superior performance when compared to the conventional hybrid precoding schemes.