A Dynamic Codebook Design for Analog Beamforming in MIMO LEO Satellite Communications

TL;DR

This paper introduces a dynamic codebook for analog beamforming in MIMO LEO satellite communications that maintains stable gain and improves SINR without requiring link retraining.

Contribution

A novel dynamic codebook design tailored for LEO satellite MIMO systems that enhances stability and performance over traditional terrestrial codebooks.

Findings

Provides stable beamforming gain during satellite coverage periods

Achieves higher SINR compared to DFT codebooks

Reduces need for link retraining and extra calculations

Abstract

Beamforming gain is a key ingredient in the performance of LEO satellite communication systems to be integrated into cellular networks. However, beam codebooks previously designed in the context of MIMO communication for terrestrial networks, do not provide the appropriate performance in terms of inter-beam interference and gain stability as the satellite moves. In this paper, we propose a dynamic codebook that provides a stable gain during the period of time that the satellite covers a given cell, while avoiding link retraining and extra calculation as the satellite moves. In addition, the proposed codebook provides a higher signal-to-interference-plus-noise (SINR) ratio than those DFT codebooks commonly used in cellular systems.