# Low-complexity Location-aware Multi-user Massive MIMO Beamforming for High Speed Train Communications

## TL;DR

This paper proposes a low-complexity, location-aware beamforming method for multi-user massive MIMO systems in high-speed train communications, enhancing service efficiency with reduced computational complexity.

## Contribution

It introduces a novel low-complexity beamforming approach based on location information and a suboptimal solution to mitigate inter-beam interference in HST scenarios.

## Key findings

- Improved service competence in simulations
- Reduced computational complexity of beamforming
- Effective interference mitigation

## Abstract

Massive Multiple-input Multiple-output (MIMO) adaption is one of the primary evolving objectives for the next generation high speed train (HST) communication system. In this paper, we consider how to design an efficient low-complexity location-aware beamforming for the multi-user (MU) massive MIMO system in HST scenario. We first put forward a low-complexity beamforming based on location information, where multiple users are considered. Then, without considering inter-beam interference, a closed-form solution to maximize the total service competence of base station (BS) is proposed in this MU HST scenario. Finally, we present a location-aid searching-based suboptimal solution to eliminate the inter-beam interference and maximize the BS service competence. Various simulations are given to exhibit the advantages of our proposed massive MIMO beamforming method.