no code implementations • 29 Jan 2025 • Aniol Martí, Luca Sanguinetti, Meritxell Lamarca, Jaume Riba
Noncoherent communication systems have regained interest due to the growing demand for high-mobility and low-latency applications.
1 code implementation • 7 Nov 2024 • Özlem Tuğfe Demir, Emil Björnson, Luca Sanguinetti
We call this the reduced-subspace least squares (RS-LS) estimator and optimize the RIS phase-shift pattern for it.
no code implementations • 24 Oct 2024 • Yibo Wu, Luca Sanguinetti, Musa Furkan Keskin, Ulf Gustavsson, Alexandre Graell i Amat, Henk Wymeersch
Based on our OFDM signal model, we propose two PN-aware channel and common phase error estimators: a distributed estimator for uncorrelated PN with separate LOs and a centralized estimator with shared LOs.
no code implementations • 10 Oct 2024 • Nour Hello, Mattia Merluzzi, Emilio Calvanese Strinati, Luca Sanguinetti
This paper investigates how semantic communication can effectively influence and potentially redefine the limitations imposed by physical layer settings.
no code implementations • 4 Dec 2023 • Amna Irshad, Alva Kosasih, Emil Björnson, Luca Sanguinetti
We optimize the rank and condition number by identifying the optimal antenna spacing in dual-polarized planar antenna arrays with imperfect isolation.
no code implementations • 21 May 2023 • Yibo Wu, Luca Sanguinetti, Ulf Gustavsson, Alexandre Graell i Amat, Henk Wymeersch
Cell-Free massive MIMO networks provide huge power gains and resolve inter-cell interference by coherent processing over a massive number of distributed instead of co-located antennas in access points (APs).
no code implementations • 23 May 2022 • Özlem Tuğfe Demir, Emil Björnson, Luca Sanguinetti
A reconfigurable intelligent surface (RIS) can be used to improve the channel gain between a base station (BS) and user equipment (UE), but only if its $N$ reflecting elements are configured properly.
no code implementations • 19 Jan 2022 • Anup Mishra, Yijie Mao, Luca Sanguinetti, Bruno Clerckx
This letter focuses on integrating rate-splitting multiple-access (RSMA) with time-division-duplex Cell-free Massive MIMO (multiple-input multiple-output) for massive machine-type communications.
no code implementations • 3 Nov 2021 • Antonio A. D'Amico, Andrea de Jesus Torres, Luca Sanguinetti, Moe Win
Multiple antennas arrays play a key role in wireless networks for communications but also for localization and sensing applications.
no code implementations • 21 Sep 2021 • Andrea Pizzo, Andrea de Jesus Torres, Luca Sanguinetti, Thomas L. Marzetta
A signal space approach is presented to study the Nyquist sampling, number of degrees of freedom and reconstruction of an electromagnetic field under arbitrary scattering conditions.
no code implementations • 23 Jun 2021 • Luca Sanguinetti, Antonio A. D'Amico, Merouane Debbah
The simplest implementation provides the same spectral efficiency of a singular-value decomposition architecture with water-filling when the receiver size is comparable to the transmission range.
no code implementations • 21 Jun 2021 • Andrea de Jesus Torres, Luca Sanguinetti, Emil Björnson
The model is used to show that electromagnetic interference has a non-negligible impact on communication performance, especially when the size of the RIS grows large.
no code implementations • 30 Apr 2021 • Andrea de Jesus Torres, Antonio Alberto D'Amico, Luca Sanguinetti, Moe Z. Win
Multiple antenna arrays play a key role in wireless networks for communications but also localization and sensing.
2 code implementations • 1 Feb 2021 • Emil Björnson, Henk Wymeersch, Bho Matthiesen, Petar Popovski, Luca Sanguinetti, Elisabeth de Carvalho
We will provide the formulas and derivations that are required to understand and analyze RIS-aided systems using signal processing, and exemplify how they can be utilized for improved communication, localization, and sensing.
no code implementations • 27 Nov 2020 • Andrea de Jesus Torres, Luca Sanguinetti, Emil Björnson
This paper studies the uplink spectral efficiency (SE) achieved by two single-antenna user equipments (UEs) communicating with a Large Intelligent Surface (LIS), defined as a planar array consisting of $N$ antennas that each has area $A$.
1 code implementation • 12 Feb 2020 • Emil Björnson, Luca Sanguinetti
In this paper, we use a deterministic propagation model for a planar array of arbitrary size, to demonstrate that the mentioned SNR behaviors, and associated power scaling laws, only apply in the far-field.
Information Theory Signal Processing Information Theory
1 code implementation • 8 Aug 2019 • Emil Björnson, Luca Sanguinetti
The main challenge is to achieve the benefits of cell-free operation in a practically feasible way, with computational complexity and fronthaul requirements that are scalable to large networks with many users.
Information Theory Signal Processing Information Theory
1 code implementation • 25 Mar 2019 • Emil Björnson, Luca Sanguinetti
Cell-free Massive MIMO is considered as a promising technology for satisfying the increasing number of users and high rate expectations in beyond-5G networks.
Information Theory Signal Processing Information Theory
no code implementations • 17 Dec 2018 • Alessio Zappone, Luca Sanguinetti, Merouane Debbah
This work investigates the use of deep learning to perform user cell association for sum-rate maximization in Massive MIMO networks.
no code implementations • 10 Dec 2018 • Luca Sanguinetti, Alessio Zappone, Merouane Debbah
The use of deep learning significantly improves the complexity-performance trade-off of power allocation, compared to traditional optimization-oriented methods.
1 code implementation • 5 Nov 2018 • Emil Björnson, Luca Sanguinetti, Jakob Hoydis
To determine when this approximation is accurate, basic properties of distortion correlation are first uncovered.
Information Theory Information Theory
no code implementations • 12 Apr 2018 • E. Veronica Belmega, Panayotis Mertikopoulos, Romain Negrel, Luca Sanguinetti
Spurred by the enthusiasm surrounding the "Big Data" paradigm, the mathematical and algorithmic tools of online optimization have found widespread use in problems where the trade-off between data exploration and exploitation plays a predominant role.
1 code implementation • 1 May 2017 • Emil Björnson, Jakob Hoydis, Luca Sanguinetti
The capacity of cellular networks can be improved by the unprecedented array gain and spatial multiplexing offered by Massive MIMO.
Information Theory Information Theory
no code implementations • 3 Jun 2016 • Panayotis Mertikopoulos, E. Veronica Belmega, Romain Negrel, Luca Sanguinetti
In this paper, we investigate a distributed learning scheme for a broad class of stochastic optimization problems and games that arise in signal processing and wireless communications.
1 code implementation • 24 Mar 2014 • Emil Björnson, Luca Sanguinetti, Jakob Hoydis, Mérouane Debbah
Numerical and analytical results show that the maximal EE is achieved by a massive MIMO setup wherein hundreds of antennas are deployed to serve a relatively large number of users using ZF processing.
Information Theory Networking and Internet Architecture Information Theory