# High-Mobility Massive MIMO Communications:Doppler Compensation and Transmit Diversity

## TL;DR

This paper introduces two novel transmit diversity schemes with angle domain Doppler compensation for high-mobility massive MIMO uplink, improving diversity and performance over conventional methods.

## Contribution

It proposes two innovative transmit diversity schemes incorporating Doppler compensation and angle domain techniques for high-mobility massive MIMO systems.

## Key findings

- Both schemes achieve transmit diversity.
- They outperform conventional schemes in simulations.
- The schemes effectively handle high mobility Doppler effects.

## Abstract

High-mobility wireless communications have been receiving a lot attentions. In this paper, we consider the highmobility uplink transmission from a high-speed terminal (HST) to a base station (BS). We propose two transmit diversity schemes for high-mobility massive communications with angle domain Doppler compensation. In the first scheme, we propose the idea of block-wise angle domain Doppler compensation, such that the uplink equivalent channel would exhibit the feature of nearly perfect independent block fading. The signal space diversity encoding technique is then exploited to achieve transmit diversity. In the second scheme, the multiple parallel beamformers with Doppler compensation are exclusively occupied to transmit multiple orthogonal space-time block coding (OSTBC) data streams. Both analysis and numerical results verify that both the proposed schemes can achieve transmit diversity and outperform the conventional scheme.