Search Results for author: Hamza Djelouat

Found 10 papers, 0 papers with code

Low-Complexity Near-Field Channel Estimation for Hybrid RIS Assisted Systems

no code implementations26 Apr 2024 Rafaela Schroeder, Jiguang He, Hamza Djelouat, Markku Juntti

We investigate the channel estimation (CE) problem for hybrid RIS assisted systems and focus on the near-field (NF) regime.

Device Detection and Channel Estimation in MTC with Correlated Activity Pattern

no code implementations23 Oct 2023 Hamza Djelouat, Mikko J. Sillanpää, Markku Juntti

This paper provides a solution for the activity detection and channel estimation problem in grant-free access with correlated device activity patterns.

Action Detection Activity Detection +1

Hierarchical MTC User Activity Detection and Channel Estimation with Unknown Spatial Covariance

no code implementations16 Oct 2023 Hamza Djelouat, Mikko J. Sillanpää, Markus Leinonen, Markku Juntti

To solve the JUICE problem, we first leverage the concept of strong priors and propose a hierarchical-sparsity-inducing spike-and-slab prior to model the structured sparse activity pattern.

Action Detection Activity Detection +1

Joint Activity Detection and Channel Estimation for Clustered Massive Machine Type Communications

no code implementations4 May 2023 Leatile Marata, Onel Luis Alcaraz López, Andreas Hauptmann, Hamza Djelouat, Hirley Alves

Compressed sensing multi-user detection (CS-MUD) algorithms play a key role in optimizing grant-free (GF) non-orthogonal multiple access (NOMA) for massive machine-type communications (mMTC).

Action Detection Activity Detection

Joint Estimation of Clustered User Activity and Correlated Channels with Unknown Covariance in mMTC

no code implementations30 Nov 2022 Hamza Djelouat, Markus Leinonen, Markku Juntti

This paper considers joint user identification and channel estimation (JUICE) in grant-free access with a \emph{clustered} user activity pattern.

Action Detection Activity Detection

Joint Coherent and Non-Coherent Detection and Decoding Techniques for Heterogeneous Networks

no code implementations27 Sep 2022 Leatile Marata, Onel Luis Alcaraz López, Hamza Djelouat, Markus Leinonen, Hirley Alves, Markku Juntti

Cellular networks that are traditionally designed for human-type communication (HTC) have the potential to provide cost effective connectivity to machine-type communication (MTC).

User Activity Detection and Channel Estimation of Spatially Correlated Channels via AMP in Massive MTC

no code implementations8 Dec 2021 Hamza Djelouat, Leatile Marata, Markus Leinonen, Hirley Alves, Markku Juntti

This paper addresses the problem of joint user identification and channel estimation (JUICE) for grant-free access in massive machine-type communications (mMTC).

Action Detection Activity Detection

Spatial Correlation Aware Compressed Sensing for User Activity Detection and Channel Estimation in Massive MTC

no code implementations17 Apr 2021 Hamza Djelouat, Markus Leinonen, Markku Juntti

First, for the case without prior information, we formulate the JUICE as an iterative reweighted $\ell_{2, 1}$-norm minimization problem.

Action Detection Activity Detection

Iterative Reweighted Algorithms for Joint User Identification and Channel Estimation in Spatially Correlated Massive MTC

no code implementations15 Mar 2021 Hamza Djelouat, Markus Leinonen, Markku Juntti

Joint user identification and channel estimation (JUICE) is a main challenge in grant-free massive machine-type communications (mMTC).

Action Detection Activity Detection

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