Search Results for author: Henk Wymeersch

Found 84 papers, 15 papers with code

On the Impact of Phase Noise on Monostatic Sensing in OFDM ISAC Systems

no code implementations24 Nov 2022 Musa Furkan Keskin, Carina Marcus, Olof Eriksson, Henk Wymeersch, Visa Koivunen

Phase noise (PN) can become a major bottleneck for integrated sensing and communications (ISAC) systems towards 6G wireless networks.

RIS-Enabled SISO Localization under User Mobility and Spatial-Wideband Effects

no code implementations17 Nov 2022 Kamran Keykhosravi, Musa Furkan Keskin, Gonzalo Seco-Granados, Petar Popovski, Henk Wymeersch

Specifically, we observe that the state of the user with a high speed (42 m/s) can be estimated virtually with the same accuracy as a static user.

Bayesian Integrity Monitoring for Cellular Positioning -- A Simplified Case Study

no code implementations14 Nov 2022 Liqin Ding, Gonzalo Seco-Granados, Hyowon Kim, Russ Whiton, Erik G. Ström, Jonas Sjöberg, Henk Wymeersch

Bayesian receiver autonomous integrity monitoring (RAIM) algorithms are developed for the snapshot cellular positioning problem in a simplified one-dimensional (1D) linear Gaussian setting.

Fault Detection

Misspecified Cramér-Rao Bound of RIS-aided Localization under Geometry Mismatch

no code implementations13 Nov 2022 Pinjun Zheng, Hui Chen, Tarig Ballal, Henk Wymeersch, Tareq Y. Al-Naffouri

In 5G/6G wireless systems, reconfigurable intelligent surfaces (RIS) can play a role as a passive anchor to enable and enhance localization in various scenarios.

Compressed-Sensing-Based 3D Localization with Distributed Passive Reconfigurable Intelligent Surfaces

no code implementations27 Oct 2022 Jiguang He, Aymen Fakhreddine, Henk Wymeersch, George C. Alexandropoulos

In this paper, the programmable signal propagation paradigm, enabled by Reconfigurable Intelligent Surfaces (RISs), is exploited for high accuracy $3$-Dimensional (3D) user localization with a single multi-antenna base station.

Compressive Sensing

Analysis of V2X Sidelink Positioning in sub-6 GHz

no code implementations27 Oct 2022 Yu Ge, Maximilian Stark, Musa Furkan Keskin, Frank Hofmann, Thomas Hansen, Henk Wymeersch

Radio positioning is an important part of joint communication and sensing in beyond 5G communication systems.

Joint User Localization and Location Calibration of A Hybrid Reconfigurable Intelligent Surface

no code implementations18 Oct 2022 Reza Ghazalian, Hui Chen, George C. Alexandropoulos, Gonzalo Seco-Granados, Henk Wymeersch, Riku Jäntti

The recent research in the emerging technology of reconfigurable intelligent surfaces (RISs) has identified its high potential for localization and sensing.

Spatial Signal Design for Positioning via End-to-End Learning

no code implementations26 Sep 2022 Steven Rivetti, Josè Miguel Mateos-Ramos, Yibo Wu, Jinxiang Song, Musa Furkan Keskin, Vijaya Yajnanarayana, Christian Häger, Henk Wymeersch

This letter considers the problem of end-to-end learning for joint optimization of transmitter precoding and receiver processing for mmWave downlink positioning.

Localization Coverage Analysis of THz Communication Systems with a 3D Array

no code implementations19 Sep 2022 Pinjun Zheng, Tarig Ballal, Hui Chen, Henk Wymeersch, Tareq Y. Al-Naffouri

This paper considers the problem of estimating the position and orientation of a user equipped with a three-dimensional (3D) array receiving downlink far-field THz signals from multiple base stations with known positions and orientations.

Wideband mmWave Massive MIMO Channel Estimation and Localization

no code implementations18 Sep 2022 Shudi Weng, Fan Jiang, Henk Wymeersch

Spatial wideband effects are known to affect channel estimation and localization performance in millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems.

Optimization of RIS-aided Integrated Localization and Communication

no code implementations6 Sep 2022 Fan Jiang, Andrea Abrardo, Kamran Keykhoshravi, Henk Wymeersch, Davide Dardari, Marco Di Renzo

Reconfigurable intelligent surfaces (RISs) have tremendous potential to boost communication performance, especially when the line-of-sight (LOS) path between the user equipment (UE) and base station (BS) is blocked.

Radio Localization and Sensing -- Part I: Fundamentals

no code implementations1 Sep 2022 Henk Wymeersch, Gonzalo Seco-Granados

This letter is part of a two-letter tutorial on radio localization and sensing, with focus on mobile radio systems in 5G mmWave and beyond.

Radio Localization and Sensing -- Part II: State-of-the-art and Challenges

no code implementations1 Sep 2022 Henk Wymeersch, Gonzalo Seco-Granados

This letter is part of a two-letter tutorial on radio localization and sensing, with a focus on mobile radio systems, i. e., 5G and beyond.

Doppler Exploitation in Bistatic mmWave Radio SLAM

no code implementations22 Aug 2022 Yu Ge, Ossi Kaltiokallio, Hui Chen, Fan Jiang, Jukka Talvitie, Mikko Valkama, Lennart Svensson, Henk Wymeersch

Networks in 5G and beyond utilize millimeter wave (mmWave) radio signals, large bandwidths, and large antenna arrays, which bring opportunities in jointly localizing the user equipment and mapping the propagation environment, termed as simultaneous localization and mapping (SLAM).

Simultaneous Localization and Mapping

Cramér-Rao Bound Analysis of Radars for Extended Vehicular Targets with Known and Unknown Shape

no code implementations11 Jul 2022 Nil Garcia, Alessio Fascista, Angelo Coluccia, Henk Wymeersch, Canan Aydogdu, Rico Mendrzik, Gonzalo Seco-Granados

In this work, we first devise a mathematically tractable analytical model for a vehicle with arbitrary shape, modeled as an extended target parameterized by the center position, the orientation (heading) and the perimeter contour.

Bi-Static Sensing for Near-Field RIS Localization

no code implementations28 Jun 2022 Reza Ghazalian, Kamran Keykhosravi, Hui Chen, Henk Wymeersch, Riku Jäntti

Due to the deployment of RISs with a large dimension, near-field (NF) scenarios are likely to occur, especially for indoor applications, and are the focus of this work.

Doppler-Enabled Single-Antenna Localization and Mapping Without Synchronization

no code implementations30 May 2022 Hui Chen, Fan Jiang, Yu Ge, Hyowon Kim, Henk Wymeersch

With the help of multipath components (MPCs), localization and mapping tasks can be done with a single base station (BS) and single unsynchronized user equipment (UE) if both of them are equipped with an antenna array.

Channel Model Mismatch Analysis for XL-MIMO Systems from a Localization Perspective

1 code implementation30 May 2022 Hui Chen, Ahmed Elzanaty, Reza Ghazalian, Musa Furkan Keskin, Riku Jäntti, Henk Wymeersch

Radio localization is applied in high-frequency (e. g., mmWave and THz) systems to support communication and to provide location-based services without extra infrastructure.

On the Impact of Hardware Impairments on RIS-aided Localization

no code implementations25 May 2022 Cuneyd Ozturk, Musa Furkan Keskin, Henk Wymeersch, Sinan Gezici

We investigate a reconfigurable intelligent surface (RIS)-aided near-field localization system with single-antenna user equipment (UE) and base station (BS) under hardware impairments by considering a practical phase-dependent RIS amplitude variations model.

Monostatic Sensing with OFDM under Phase Noise: From Mitigation to Exploitation

no code implementations17 May 2022 Musa Furkan Keskin, Henk Wymeersch, Visa Koivunen

We consider the problem of monostatic radar sensing with orthogonal frequency-division multiplexing (OFDM) joint radar-communications (JRC) systems in the presence of phase noise (PN) caused by oscillator imperfections.

Frequency-domain digital predistortion for Massive MU-MIMO-OFDM Downlink

no code implementations10 May 2022 Yibo Wu, Ulf Gustavsson, Mikko Valkama, Alexandre Graell i Amat, Henk Wymeersch

In this paper, we propose a convolutional neural network (CNN)-based DPD in the frequency domain, taking place before the precoding, where the dimensionality of the signal space depends on the number of users, instead of the number of BS antennas.

PMBM-based SLAM Filters in 5G mmWave Vehicular Networks

no code implementations5 May 2022 Hyowon Kim, Karl Granström, Lennart Svensson, Sunwoo Kim, Henk Wymeersch

Secondly, the Poisson multi-Bernoulli (PMB) SLAM filter is based on the standard reduction from PMBM to PMB, but involves a novel interpretation based on auxiliary variables and a relation to Bethe free energy.

Association Simultaneous Localization and Mapping

RIS-aided Joint Localization and Synchronization with a Single-Antenna Receiver: Beamforming Design and Low-Complexity Estimation

no code implementations28 Apr 2022 Alessio Fascista, Musa Furkan Keskin, Angelo Coluccia, Henk Wymeersch, Gonzalo Seco-Granados

In this paper, a novel low-complexity method for joint localization and synchronization based on an optimized design of the base station (BS) active precoding and RIS passive phase profiles is proposed, for the challenging case of a single-antenna receiver.

Robust Design

RIS-aided Near-Field Localization under Phase-Dependent Amplitude Variations

no code implementations27 Apr 2022 Cuneyd Ozturk, Musa Furkan Keskin, Henk Wymeersch, Sinan Gezici

The proposed method can successfully recover the performance loss of the AMML under a wide range of RIS parameters and effectively calibrate the RIS amplitude model online with the help of a user that has an a-priori unknown location.

MCRB-based Performance Analysis of 6G Localization under Hardware Impairments

no code implementations27 Apr 2022 Hui Chen, Sina Rezaei Aghdam, Musa Furkan Keskin, Yibo Wu, Simon Lindberg, Andreas Wolfgang, Ulf Gustavsson, Thomas Eriksson, Henk Wymeersch

Location information is expected to be the key to meeting the needs of communication and context-aware services in 6G systems.

MmWave 6D Radio Localization with a Snapshot Observation from a Single BS

no code implementations11 Apr 2022 Mohammad A. Nazari, Gonzalo Seco-Granados, Pontus Johannisson, Henk Wymeersch

We consider the single base station localization problem and extend it to 3D position and 3D orientation estimation of an unsynchronized multi-antenna user, using downlink MIMO-OFDM signals.

Arbitrary Beam Pattern Approximation via RISs with Measured Element Responses

no code implementations14 Mar 2022 Moustafa Rahal, Benoît Denis, Kamran Keykhosravi, Furkan Keskin, Bernard Uguen, George C. Alexandropoulos, Henk Wymeersch

Smart radio environments (SREs) are seen as a key rising concept of next generation wireless networks, where propagation channels between transmitters and receivers are purposely controlled.

Constrained RIS Phase Profile Optimization and Time Sharing for Near-field Localization

no code implementations14 Mar 2022 Moustafa Rahal, Benoît Denis, Kamran Keykhosravi, Furkan Keskin, Bernard Uguen, Henk Wymeersch

The rising concept of reconfigurable intelligent surface (RIS) has promising potential for Beyond 5G localization applications.

RIS-Enabled Self-Localization: Leveraging Controllable Reflections With Zero Access Points

no code implementations22 Feb 2022 Kamran Keykhosravi, Gonzalo Seco-Granados, George C. Alexandropoulos, Henk Wymeersch

In this paper, we introduce a novel use-case of the RIS technology in radio localization, which is enabling the user to estimate its own position via transmitting orthogonal frequency-division multiplexing (OFDM) pilots and processing the signal reflected from the RIS.

Can Deep Learning be Applied to Model-Based Multi-Object Tracking?

1 code implementation16 Feb 2022 Juliano Pinto, Georg Hess, William Ljungbergh, Yuxuan Xia, Henk Wymeersch, Lennart Svensson

Multi-object tracking (MOT) is the problem of tracking the state of an unknown and time-varying number of objects using noisy measurements, with important applications such as autonomous driving, tracking animal behavior, defense systems, and others.

Association Autonomous Driving +1

Iterated Posterior Linearization PMB Filter for 5G SLAM

no code implementations5 Dec 2021 Yu Ge, Yibo Wu, Fan Jiang, Ossi Kaltiokallio, Jukka Talvitie, Mikko Valkama, Lennart Svensson, Henk Wymeersch

In this paper, we study the linearization of the measurement function with respect to the posterior PDF, and implement the iterated posterior linearization filter into the Poisson multi-Bernoulli SLAM filter.

Simultaneous Localization and Mapping

Model-Based End-to-End Learning for WDM Systems With Transceiver Hardware Impairments

1 code implementation29 Nov 2021 Jinxiang Song, Christian Häger, Jochen Schröder, Alexandre Graell i Amat, Henk Wymeersch

Simulation results show that the reinforcement-learning-based algorithm achieves similar performance to the standard supervised end-to-end learning approach assuming perfect channel knowledge.

reinforcement-learning

Beamspace Multidimensional ESPRIT Approaches for Simultaneous Localization and Communications

no code implementations14 Nov 2021 Fan Jiang, Fuxi Wen, Yu Ge, Meifang Zhu, Henk Wymeersch, Fredrik Tufvesson

The proposed method is compared to the tensor ESPRIT method, in terms of channel estimation, communication, localization, and sensing performance, further validating the perturbation analysis.

End-to-End Learning for Integrated Sensing and Communication

no code implementations3 Nov 2021 José Miguel Mateos-Ramos, Jinxiang Song, Yibo Wu, Christian Häger, Musa Furkan Keskin, Vijaya Yajnanarayana, Henk Wymeersch

The approach includes the proposal of the AE architecture, a novel ISAC loss function, and the training procedure.

A Tutorial on Terahertz-Band Localization for 6G Communication Systems

1 code implementation16 Oct 2021 Hui Chen, Hadi Sarieddeen, Tarig Ballal, Henk Wymeersch, Mohamed-Slim Alouini, Tareq Y. Al-Naffouri

Terahertz (THz) communications are celebrated as key enablers for converged localization and sensing in future sixth-generation (6G) wireless communication systems and beyond.

RIS-Enabled Localization Continuity Under Near-Field Conditions

no code implementations24 Sep 2021 Moustafa Rahal, Benoit Denis, Kamran Keykhosravi, Bernard Uguen, Henk Wymeersch

Reconfigurable intelligent surfaces (RISs) have the potential to enable user localization in scenarios where traditional approaches fail.

Beyond 5G RIS mmWave Systems: Where Communication and Localization Meet

no code implementations16 Sep 2021 Jiguang He, Fan Jiang, Kamran Keykhosravi, Joonas Kokkoniemi, Henk Wymeersch, Markku Juntti

Upcoming beyond fifth generation (5G) communications systems aim at further enhancing key performance indicators and fully supporting brand new use cases by embracing emerging techniques, e. g., reconfigurable intelligent surface (RIS), integrated communication, localization, and sensing, and mmWave/THz communications.

A Computationally Efficient EK-PMBM Filter for Bistatic mmWave Radio SLAM

no code implementations8 Sep 2021 Yu Ge, Ossi Kaltiokallio, Hyowon Kim, Fan Jiang, Jukka Talvitie, Mikko Valkama, Lennart Svensson, Sunwoo Kim, Henk Wymeersch

Millimeter wave (mmWave) signals are useful for simultaneous localization and mapping (SLAM), due to their inherent geometric connection to the propagation environment and the propagation channel.

Association Simultaneous Localization and Mapping

An Uncertainty-Aware Performance Measure for Multi-Object Tracking

no code implementations10 Aug 2021 Juliano Pinto, Yuxuan Xia, Lennart Svensson, Henk Wymeersch

Evaluating the performance of multi-object tracking (MOT) methods is not straightforward, and existing performance measures fail to consider all the available uncertainty information in the MOT context.

Multi-Object Tracking

mmWave Simultaneous Localization and Mapping Using a Computationally Efficient EK-PHD Filter

no code implementations3 Aug 2021 Ossi Kaltiokallio, Yu Ge, Jukka Talvitie, Henk Wymeersch, Mikko Valkama

Future cellular networks that utilize millimeter wave signals provide new opportunities in positioning and situational awareness.

Simultaneous Localization and Mapping

Learning to Estimate RIS-Aided mmWave Channels

1 code implementation27 Jul 2021 Jiguang He, Henk Wymeersch, Marco Di Renzo, Markku Juntti

Inspired by the remarkable learning and prediction performance of deep neural networks (DNNs), we apply one special type of DNN framework, known as model-driven deep unfolding neural network, to reconfigurable intelligent surface (RIS)-aided millimeter wave (mmWave) single-input multiple-output (SIMO) systems.

Dirichlet process approach for radio-based simultaneous localization and mapping

no code implementations2 Jul 2021 Jaebok Lee, Hyowon Kim, Henk Wymeersch, Sunwoo Kim

By comparing the results with the SLAM based on the Rao-Blackwellized probability hypothesis density filter, we confirm a slight drop in SLAM performance, but as a result, we validate that it has a significant gain in computational complexity.

Simultaneous Localization and Mapping

Cooperative mmWave PHD-SLAM with Moving Scatterers

no code implementations22 Jun 2021 Hyowon Kim, Jaebok Lee, Yu Ge, Fan Jiang, Sunwoo Kim, Henk Wymeersch

Using the multiple-model (MM) probability hypothesis density (PHD) filter, millimeter wave (mmWave) radio simultaneous localization and mapping (SLAM) in vehicular scenarios is susceptible to movements of objects, in particular vehicles driving in parallel with the ego vehicle.

Simultaneous Localization and Mapping

Multi-RIS Discrete-Phase Encoding for Interpath-Interference-Free Channel Estimation

no code implementations13 Jun 2021 Kamran Keykhosravi, Henk Wymeersch

We take into consideration the limited resolution of the RIS phase shifters and show that in the presence of this practical limitation, orthogonal phase profiles can be designed based on Butson-type Hadamard matrices.

Over-the-fiber Digital Predistortion Using Reinforcement Learning

no code implementations9 Jun 2021 Jinxiang Song, Zonglong He, Christian Häger, Magnus Karlsson, Alexandre Graell i Amat, Henk Wymeersch, Jochen Schröder

We demonstrate, for the first time, experimental over-the-fiber training of transmitter neural networks (NNs) using reinforcement learning.

reinforcement-learning

Optimal Spatial Signal Design for mmWave Positioning under Imperfect Synchronization

no code implementations17 May 2021 Musa Furkan Keskin, Fan Jiang, Florent Munier, Gonzalo Seco-Granados, Henk Wymeersch

We consider the problem of spatial signal design for multipath-assisted mmWave positioning under limited prior knowledge on the user's location and clock bias.

Robust Design

Semi-Passive 3D Positioning of Multiple RIS-Enabled Users

no code implementations25 Apr 2021 Kamran Keykhosravi, Musa Furkan Keskin, Satyam Dwivedi, Gonzalo Seco-Granados, Henk Wymeersch

In this work, we study the application of RIS in a multi-user passive localization scenario, where we have one transmitter (Tx) and multiple asynchronous receivers (Rxs) with known locations.

Low Complexity Joint Impairment Mitigation of I/Q Modulator and PA Using Neural Networks

no code implementations6 Apr 2021 Yibo Wu, Ulf Gustavsson, Alexandre Graell i Amat, Henk Wymeersch

Neural networks (NNs) for multiple hardware impairments mitigation of a realistic direct conversion transmitter are impractical due to high computational complexity.

Hybrid Relay-Reflecting Intelligent Surface-Aided Wireless Communications: Opportunities, Challenges, and Future Perspectives

no code implementations5 Apr 2021 Nhan Thanh Nguyen, Jiguang He, Van-Dinh Nguyen, Henk Wymeersch, Derrick Wing Kwan Ng, Robert Schober, Symeon Chatzinotas, Markku Juntti

In this paper, we provide an overview of a hybrid relay-reflecting intelligent surface (HR-RIS) architecture, in which only a few elements are active and connected to power amplifiers and radio frequency chains.

Next Generation Multitarget Trackers: Random Finite Set Methods vs Transformer-based Deep Learning

1 code implementation1 Apr 2021 Juliano Pinto, Georg Hess, William Ljungbergh, Yuxuan Xia, Lennart Svensson, Henk Wymeersch

We show that the proposed model outperforms state-of-the-art Bayesian filters in complex scenarios, while matching their performance in simpler cases, which validates the applicability of deep-learning also in the model-based regime.

Autonomous Driving

Radar Sensing with OTFS: Embracing ISI and ICI to Surpass the Ambiguity Barrier

no code implementations30 Mar 2021 Musa Furkan Keskin, Henk Wymeersch, Alex Alvarado

Orthogonal time frequency space (OTFS) is a promising alternative to orthogonal frequency division multiplexing (OFDM) in high-mobility beyond 5G communications.

MIMO-OFDM Joint Radar-Communications: Is ICI Friend or Foe?

no code implementations29 Mar 2021 Musa Furkan Keskin, Henk Wymeersch, Visa Koivunen

For each estimated angle, we next formulate the radar delay-Doppler estimation as a joint carrier frequency offset (CFO) and channel estimation problem via an APES (amplitude and phase estimation) spatial filtering approach by transforming the delay-Doppler parameterized radar channel into an unstructured form.

End-to-end Autoencoder for Superchannel Transceivers with Hardware Impairment

no code implementations29 Mar 2021 Jinxiang Song, Christian Häger, Jochen Schröder, Alexandre Graell i Amat, Henk Wymeersch

We propose an end-to-end learning-based approach for superchannel systems impaired by non-ideal hardware component.

Distributed Channel Access for Control Over Unknown Memoryless Communication Channels

no code implementations10 Mar 2021 Tahmoores Farjam, Henk Wymeersch, Themistoklis Charalambous

This property is then exploited for developing our distributed deterministic channel access scheme.

Millimeter-wave Mobile Sensing and Environment Mapping: Models, Algorithms and Validation

1 code implementation23 Feb 2021 Carlos Baquero Barneto, Elizaveta Rastorgueva-Foi, Musa Furkan Keskin, Taneli Riihonen, Matias Turunen, Jukka Talvitie, Henk Wymeersch, Mikko Valkama

Integrating efficient connectivity, positioning and sensing functionalities into 5G New Radio (NR) and beyond mobile cellular systems is one timely research paradigm, especially at mm-wave and sub-THz bands.

Association

Chance-Constrained Active Inference

no code implementations17 Feb 2021 Thijs van de Laar, Ismail Senoz, Ayça Özçelikkale, Henk Wymeersch

We illustrate how chance-constrained ActInf weights all imposed (prior) constraints on the generative model, allowing e. g., for a trade-off between robust control and empirical chance constraint violation.

ICI-Aware Parameter Estimation for MIMO-OFDM Radar via APES Spatial Filtering

no code implementations12 Feb 2021 Musa Furkan Keskin, Henk Wymeersch, Visa Koivunen

We propose a novel three-stage delay-Doppler-angle estimation algorithm for a MIMO-OFDM radar in the presence of inter-carrier interference (ICI).

Reconfigurable Intelligent Surfaces: A Signal Processing Perspective With Wireless Applications

2 code implementations1 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.

3D Orientation Estimation with Multiple 5G mmWave Base Stations

no code implementations5 Jan 2021 Mohammad A. Nazari, Gonzalo Seco-Granados, Pontus Johannisson, Henk Wymeersch

We show that the received signals from several base stations, having known positions, can be used to estimate the unknown orientation of the user.

SISO RIS-Enabled Joint 3D Downlink Localization and Synchronization

1 code implementation4 Nov 2020 Kamran Keykhosravi, Musa Furkan Keskin, Gonzalo Seco-Granados, Henk Wymeersch

We consider the problem of joint three-dimensional localization and synchronization for a single-input single-output (SISO) system in the presence of a reconfigurable intelligent surface (RIS), equipped with a uniform planar array.

Signal Processing Information Theory Information Theory

RIS-aided Joint Localization and Synchronization with a Single-Antenna MmWave Receiver

no code implementations28 Oct 2020 Alessio Fascista, Angelo Coluccia, Henk Wymeersch, Gonzalo Seco-Granados

However, for MISO systems synchronization cannot be performed jointly with user localization unless two-way transmissions are used.

Leveraging Location Information for RIS-aided mmWave MIMO Communications

no code implementations27 Oct 2020 Jiguang He, Henk Wymeersch, Markku Juntti

Location information offered by external positioning systems, e. g., satellite navigation, can be used as prior information in the process of beam alignment and channel parameter estimation for reconfigurable intelligent surface (RIS)-aided millimeter wave (mmWave) multiple-input multiple-output networks.

Near-field Localization with a Reconfigurable Intelligent Surface Acting as Lens

1 code implementation12 Oct 2020 Zohair Abu-Shaban, Kamran Keykhosravi, Musa Furkan Keskin, George C. Alexandropoulos, Gonzalo Seco-Granados, Henk Wymeersch

Exploiting wavefront curvature enables localization with limited infrastructure and hardware complexity.

Signal Processing Information Theory Information Theory

Beyond 5G Wireless Localization with Reconfigurable Intelligent Surfaces

no code implementations26 Aug 2020 Henk Wymeersch, Benoît Denis

5G radio positioning exploits information in both angle and delay, by virtue of increased bandwidth and large antenna arrays.

Downlink Single-Snapshot Localization and Mapping with a Single-Antenna Receiver

no code implementations29 Jul 2020 Alessio Fascista, Angelo Coluccia, Henk Wymeersch, Gonzalo Seco-Granados

5G mmWave MIMO systems enable accurate estimation of the user position and mapping of the radio environment using a single snapshot when both the base station (BS) and user are equipped with large antenna arrays.

Channel Estimation for RIS-Aided mmWave MIMO Systems via Atomic Norm Minimization

no code implementations16 Jul 2020 Jiguang He, Henk Wymeersch, Markku Juntti

A reconfigurable intelligent surface (RIS) can shape the radio propagation environment by virtue of changing the impinging electromagnetic waves towards any desired directions, thus, breaking the general Snell's reflection law.

Signal Processing Information Theory Information Theory

Exploiting Diffuse Multipath in 5G SLAM

no code implementations28 Jun 2020 Yu Ge, Hyowon Kim, Fuxi Wen, Lennart Svensson, Sunwoo Kim, Henk Wymeersch

5G millimeter wave (mmWave) signals can be used to jointly localize the receiver and map the propagation environment in vehicular networks, which is a typical simultaneous localization and mapping (SLAM) problem.

Simultaneous Localization and Mapping

Benchmarking End-to-end Learning of MIMO Physical-Layer Communication

no code implementations19 May 2020 Jinxiang Song, Christian Häger, Jochen Schröder, Tim O'Shea, Henk Wymeersch

End-to-end data-driven machine learning (ML) of multiple-input multiple-output (MIMO) systems has been shown to have the potential of exceeding the performance of engineered MIMO transceivers, without any a priori knowledge of communication-theoretic principles.

Residual Neural Networks for Digital Predistortion

no code implementations12 May 2020 Yibo Wu, Ulf Gustavsson, Alexandre Graell i Amat, Henk Wymeersch

Tracking the nonlinear behavior of an RF power amplifier (PA) is challenging.

Radio Localization and Mapping with Reconfigurable Intelligent Surfaces

no code implementations19 Dec 2019 Henk Wymeersch, Jiguang He, Benoît Denis, Antonio Clemente, Markku Juntti

5G radio at millimeter wave (mmWave) and beyond 5G concepts at 0. 1-1 THz can exploit angle and delay measurements for localization, by the virtue of increased bandwidth and large antenna arrays but are limited in terms of blockage caused by obstacles.

Bayesian Linear Regression on Deep Representations

no code implementations14 Dec 2019 John Moberg, Lennart Svensson, Juliano Pinto, Henk Wymeersch

A simple approach to obtaining uncertainty-aware neural networks for regression is to do Bayesian linear regression (BLR) on the representation from the last hidden layer.

Model-based Reinforcement Learning regression +1

5G mmWave Cooperative Positioning and Mapping using Multi-Model PHD Filter and Map Fusion

1 code implementation26 Aug 2019 Hyowon Kim, Karl Granström, Lin Gao, Giorgio Battistelli, Sunwoo Kim, Henk Wymeersch

5G millimeter wave (mmWave) signals can enable accurate positioning in vehicular networks when the base station (BS) and vehicles are equipped with large antenna arrays.

Association

Near-Field Joint Localization and Synchronization

1 code implementation17 Jul 2019 Henk Wymeersch

In 5G communication, linear and planar arrays are used for both positioning and communication.

Learning Physical-Layer Communication with Quantized Feedback

1 code implementation19 Apr 2019 Jinxiang Song, Bile Peng, Christian Häger, Henk Wymeersch, Anant Sahai

A novel quantization method is proposed, which exploits the specific properties of the feedback signal and is suitable for non-stationary signal distributions.

Quantization

A Simple Method for 5G Positioning and Synchronization without Line-of-Sight

1 code implementation13 Dec 2018 Henk Wymeersch

In 5G mmWave, joint positioning and synchronization can be achieved even when the line-of-sight path is blocked.

Signal Processing

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