# Codeword Selection and Hybrid Precoding for Multiuser Millimeter Wave Massive MIMO Systems

## TL;DR

This paper proposes a novel hybrid precoding scheme for multiuser mmWave massive MIMO systems that decouples analog and digital precoder design using an interference-free sum-rate metric, improving performance.

## Contribution

It introduces a Hungarian-based codeword selection algorithm for analog precoding that effectively avoids beam conflicts and enhances sum-rate performance.

## Key findings

- The proposed scheme outperforms existing methods in simulations.
- Decoupling precoder design simplifies the optimization process.
- Interference-free sum-rate improves system throughput.

## Abstract

Aiming at maximizing the achievable sum-rate of wideband multiuser mmWave massive MIMO systems, the hybrid precoding is studied. Since each computation of the achievable sum-rate can be performed only after the analog precoder and digital precoder are both determined, the maximization of the achievable sum-rate has intractable computational complexity. By introducing the interference free (IF) achievable sum-rate, the design of the analog and digital precoders can be decoupled. To avoid the beam conflict and maximize the IF achievable sum-rate, a Hungarian-based codeword selection algorithm is proposed for the analog precoding design. Simulation results verify the effectiveness of the proposed scheme and show that better performance can be achieved compared with existing schemes.