Hybrid beamforming is a promising technique to reduce the complexity and cost of massive multiple-input multiple-output (MIMO) systems while providing high data rate. However, the hybrid precoder design is a challenging task requiring channel state information (CSI) feedback and solving a complex optimization problem. This paper proposes a novel RSSI-based unsupervised deep learning method to design the hybrid beamforming in massive MIMO systems. Furthermore, we propose i) a method to design the synchronization signal (SS) in initial access (IA); and ii) a method to design the codebook for the analog precoder. We also evaluate the system performance through a realistic channel model in various scenarios. We show that the proposed method not only greatly increases the spectral efficiency especially in frequency-division duplex (FDD) communication by using partial CSI feedback, but also has near-optimal sum-rate and outperforms other state-of-the-art full-CSI solutions.
@article{arxiv.2007.00038,
title = {Unsupervised Deep Learning for Massive MIMO Hybrid Beamforming},
author = {Hamed Hojatian and Jeremy Nadal and Jean-Francois Frigon and Francois Leduc-Primeau},
journal= {arXiv preprint arXiv:2007.00038},
year = {2021}
}
Comments
Submitted to IEEE Transactions on Wireless Communications