In this letter, we propose a vector quantized-variational autoencoder (VQ-VAE)-based feedback scheme for robust precoder design in multi-user frequency division duplex (FDD) systems. We demonstrate how the VQ-VAE can be tailored to specific propagation environments, focusing on systems with low pilot overhead, which is crucial in massive multiple-input multiple-output (MIMO). Extensive simulations with real-world measurement data show that our proposed feedback scheme outperforms state-of-the-art autoencoder (AE)-based compression schemes and conventional Discrete Fourier transform (DFT) codebook-based schemes. These improvements enable the deployment of systems with fewer feedback bits or pilots.
@article{arxiv.2408.04505,
title = {Feedback Design with VQ-VAE for Robust Precoding in Multi-User FDD Systems},
author = {Nurettin Turan and Michael Baur and Jianqing Li and Wolfgang Utschick},
journal= {arXiv preprint arXiv:2408.04505},
year = {2024}
}