A versatile low-complexity feedback scheme for FDD systems via generative modeling

N Turan, B Fesl, M Koller, M Joham… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
We propose a versatile feedback scheme for both single-and multi-user multiple-input
multiple-output (MIMO) frequency division duplex (FDD) systems. Particularly, we propose …

Channel estimation for quantized systems based on conditionally Gaussian latent models

B Fesl, N Turan, B Böck… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
This work introduces a novel class of channel estimators tailored for coarse quantization
systems. The proposed estimators are founded on conditionally Gaussian latent generative …

Variational autoencoder leveraged mmse channel estimation

M Baur, B Fesl, M Koller… - 2022 56th Asilomar …, 2022 - ieeexplore.ieee.org
We propose to utilize a variational autoencoder (VAE) for data-driven channel estimation.
The underlying true and unknown channel distribution is modeled by the VAE as a …

Channel estimation based on Gaussian mixture models with structured covariances

B Fesl, M Joham, S Hu, M Koller… - 2022 56th Asilomar …, 2022 - ieeexplore.ieee.org
In this work, we propose variations of a Gaussian mixture model (GMM) based channel
estimator that was recently proven to be asymptotically optimal in the minimum mean square …

Leveraging variational autoencoders for parameterized MMSE channel estimation

M Baur, B Fesl, W Utschick - arXiv preprint arXiv:2307.05352, 2023 - arxiv.org
In this manuscript, we propose to utilize the generative neural network-based variational
autoencoder for channel estimation. The variational autoencoder models the underlying true …

Learning a Gaussian mixture model from imperfect training data for robust channel estimation

B Fesl, N Turan, M Joham… - IEEE Wireless …, 2023 - ieeexplore.ieee.org
In this letter, we propose a Gaussian mixture model (GMM)-based channel estimator which
is learned on imperfect training data, ie, the training data are solely comprised of noisy and …

Enhanced low-complexity FDD system feedback with variable bit lengths via generative modeling

N Turan, B Fesl, W Utschick - 2023 57th Asilomar Conference …, 2023 - ieeexplore.ieee.org
Recently, a versatile limited feedback scheme based on a Gaussian mixture model (GMM)
was proposed for frequency division duplex (FDD) systems. This scheme provides high …

Evaluation of a Gaussian mixture model-based channel estimator using measurement data

N Turan, B Fesl, M Grundei, M Koller… - 2022 International …, 2022 - ieeexplore.ieee.org
In this work, we use real-world data in order to evaluate and validate a machine learning
(ML)-based algorithm for physical layer functionalities. Specifically, we apply a recently …

On the Asymptotic Mean Square Error Optimality of Diffusion Probabilistic Models

B Fesl, B Böck, F Strasser, M Baur, M Joham… - arXiv preprint arXiv …, 2024 - arxiv.org
Diffusion probabilistic models (DPMs) have recently shown great potential for denoising
tasks. Despite their practical utility, there is a notable gap in their theoretical understanding …

Low-rank structured MMSE channel estimation with mixtures of factor analyzers

B Fesl, N Turan, W Utschick - 2023 57th Asilomar Conference …, 2023 - ieeexplore.ieee.org
This work proposes a generative modeling-aided channel estimator based on mixtures of
factor analyzers (MFA). In an offline step, the parameters of the generative model are …