# Radiation Efficiency Aware High-Mobility Massive MIMO with Antenna Selection

## TL;DR

This paper proposes a radiation efficiency-aware antenna selection and weighting scheme for high-mobility massive MIMO systems to reduce Doppler effects and improve channel stability, validated by simulations.

## Contribution

It introduces a novel antenna weighting and selection method that minimizes Doppler spread while maintaining radiation efficiency in high-mobility scenarios.

## Key findings

- Effective Doppler spread reduction demonstrated in simulations
- Antenna selection reduces RF chain usage
- Improved channel stability in high-mobility uplink

## Abstract

High-mobility wireless communications have received a lot of attentions in the past few years. In this paper, we consider angle-domain Doppler shifts compensation scheme to reduce the channel time variation for the high-mobility uplink from a high-speed terminal (HST) to a base station (BS). We propose to minimize Doppler spread by antenna weighting under the constraint of maintaining radiation efficiency. The sequential parametric convex approximation (SPCA) algorithm is exploited to solve the above non-convex problem. Moreover, in order to save the RF chains, we further exploit the idea of antenna selection for high-mobility wireless communications. Simulations verify the effectiveness of the proposed studies.