Search Results for author: Petar Popovski

Found 59 papers, 6 papers with code

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.

Dual-Polarized Massive MIMO-RSMA Networks: Tackling Imperfect SIC

no code implementations2 Nov 2022 Arthur Sousa de Sena, Pedro H. J. Nardelli, Daniel Benevides da Costa, Petar Popovski, Constantinos B. Papadias, Merouane Debbah

This paper takes advantage of this additional DoF to alleviate practical issues of successive interference cancellation (SIC) in rate-splitting multiple access (RSMA) schemes.

FedToken: Tokenized Incentives for Data Contribution in Federated Learning

no code implementations20 Sep 2022 Shashi Raj Pandey, Lam Duc Nguyen, Petar Popovski

Incentives that compensate for the involved costs in the decentralized training of a Federated Learning (FL) model act as a key stimulus for clients' long-term participation.

Federated Learning

Energy-Efficient Trajectory Design of a Multi-IRS Assisted Portable Access Point

no code implementations1 Sep 2022 Nithin Babu, Marco Virgili, Mohammad Al-jarrah, Xiaoye Jing, Emad Alsusa, Petar Popovski, Andrew Forsyth, Christos Masouros, Constantinos B. Papadias

In this work, we propose a framework for energy-efficient trajectory design of an unmanned aerial vehicle (UAV)-based portable access point (PAP) deployed to serve a set of ground nodes (GNs).

Cost-Efficient Deployment of a Reliable Multi-UAV Unmanned Aerial System

no code implementations30 Aug 2022 Nithin Babu, Petar Popovski, Constantinos B. Papadias

In this work, we study the trade-off between the reliability and the investment cost of an unmanned aerial system (UAS) consisting of a set of unmanned aerial vehicles (UAVs) carrying radio access nodes, called portable access points (PAPs)), deployed to serve a set of ground nodes (GNs).

Fairness Based Energy-Efficient 3D Path Planning of a Portable Access Point: A Deep Reinforcement Learning Approach

no code implementations10 Aug 2022 Nithin Babu, Igor Donevski, Alvaro Valcarce, Petar Popovski, Jimmy Jessen Nielsen, Constantinos B. Papadias

Moreover, the user fairness, energy efficiency, and hence the FEE value of the system can be improved by efficiently moving the PAP above the GNs.


MixTailor: Mixed Gradient Aggregation for Robust Learning Against Tailored Attacks

no code implementations16 Jul 2022 Ali Ramezani-Kebrya, Iman Tabrizian, Fartash Faghri, Petar Popovski

We introduce MixTailor, a scheme based on randomization of the aggregation strategies that makes it impossible for the attacker to be fully informed.

Floor Map Reconstruction Through Radio Sensing and Learning By a Large Intelligent Surface

no code implementations21 Jun 2022 Cristian J. Vaca-Rubio, Roberto Pereira, Xavier Mestre, David Gregoratti, Zheng-Hua Tan, Elisabeth de Carvalho, Petar Popovski

Environmental scene reconstruction is of great interest for autonomous robotic applications, since an accurate representation of the environment is necessary to ensure safe interaction with robots.

Participation and Data Valuation in IoT Data Markets through Distributed Coalitions

no code implementations15 Jun 2022 Shashi Raj Pandey, Pierre Pinson, Petar Popovski

Finally, we reveal the structure of the formulated problem as a distributed coalition game and solve it following the simplified split-and-merge algorithm.

Multiband Massive IoT: A Learning Approach to Infrastructure Deployment

no code implementations13 Jun 2022 Enes Krijestorac, Ghaith Hattab, Petar Popovski, Danijela Cabric

The first approach is based on a predefined model of the environment, while the second approach is measurement-based model-free approach, which is applicable to any environment.

Scheduling for Ground-Assisted Federated Learning in LEO Satellite Constellations

no code implementations4 Jun 2022 Nasrin Razmi, Bho Matthiesen, Armin Dekorsy, Petar Popovski

Distributed training of machine learning models directly on satellites in low Earth orbit (LEO) is considered.

Federated Learning

Predictive Rate Selection for Ultra-Reliable Communication using Statistical Radio Maps

no code implementations30 May 2022 Tobias Kallehauge, Pablo Ramìrez-Espinosa, Anders E. Kalør, Christophe Biscio, Petar Popovski

This paper proposes exploiting the spatial correlation of wireless channel statistics beyond the conventional received signal strength maps by constructing statistical radio maps to predict any relevant channel statistics to assist communications.

Gaussian Processes

Rate-Splitting Multiple Access and its Interplay with Intelligent Reflecting Surfaces

no code implementations24 May 2022 Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa, Petar Popovski, Constantinos B. Papadias

Rate-splitting multiple access (RSMA) has recently appeared as a powerful technique for improving the downlink performance of multiple-input multiple-output (MIMO) systems.

User Clustering for Rate Splitting using Machine Learning

no code implementations23 May 2022 Roberto Pereira, Anay Ajit Deshpande, Cristian J. Vaca-Rubio, Xavier Mestre, Andrea Zanella, David Gregoratti, Elisabeth de Carvalho, Petar Popovski

Hierarchical Rate Splitting (HRS) schemes proposed in recent years have shown to provide significant improvements in exploiting spatial diversity in wireless networks and provide high throughput for all users while minimising interference among them.

BIG-bench Machine Learning

User Localization using RF Sensing: A Performance comparison between LIS and mmWave Radars

no code implementations17 May 2022 Cristian J. Vaca-Rubio, Dariush Salami, Petar Popovski, Elisabeth de Carvalho, Zheng-Hua Tan, Stephan Sigg

Since electromagnetic signals are omnipresent, Radio Frequency (RF)-sensing has the potential to become a universal sensing mechanism with applications in localization, smart-home, retail, gesture recognition, intrusion detection, etc.

Gesture Recognition Intrusion Detection

Opportunities for Physical Layer Security in UAV Communication Enhanced with Intelligent Reflective Surfaces

no code implementations31 Mar 2022 Wali Ullah Khan, Eva Lagunas, Zain Ali, Muhammad Awais Javed, Manzoor Ahmed, Symeon Chatzinotas, Björn Ottersten, Petar Popovski

Unmanned Aerial Vehicles (UAVs) are an important component of next-generation wireless networks that can assist in high data rate communications and provide enhanced coverage. Their high mobility and aerial nature offer deployment flexibility and low-cost infrastructure support to existing cellular networks and provide many applications that rely on mobile wireless communications.

A Contribution-based Device Selection Scheme in Federated Learning

no code implementations10 Mar 2022 Shashi Raj Pandey, Lam D. Nguyen, Petar Popovski

In a Federated Learning (FL) setup, a number of devices contribute to the training of a common model.

Federated Learning

Analysis and Optimization of the Latency Budget in Wireless Systems with Mobile Edge Computing

no code implementations27 Jan 2022 Suraj Suman, Cedomir Stefanovic, Strahinja Došen, Petar Popovski

This is a critical link tasked with a timely and reliable transfer of potentially significant amount of data from the multitude of sensors.

Data Compression Edge-computing

Beamspace MIMO for Satellite Swarms

no code implementations16 Dec 2021 Maik Röper, Bho Matthiesen, Dirk Wübben, Petar Popovski, Armin Dekorsy

In this paper, we propose a distributed linear precoding scheme and a GS equalizer relying on local position information.

A Marketplace for Trading AI Models based on Blockchain and Incentives for IoT Data

no code implementations6 Dec 2021 Lam Duc Nguyen, Shashi Raj Pandey, Soret Beatriz, Arne Broering, Petar Popovski

An emerging paradigm in ML is a federated approach where the learning model is delivered to a group of heterogeneous agents partially, allowing agents to train the model locally with their own data.


On-Board Federated Learning for Dense LEO Constellations

no code implementations24 Nov 2021 Nasrin Razmi, Bho Matthiesen, Armin Dekorsy, Petar Popovski

Mega-constellations of small-size Low Earth Orbit (LEO) satellites are currently planned and deployed by various private and public entities.

Federated Learning

Learning, Computing, and Trustworthiness in Intelligent IoT Environments: Performance-Energy Tradeoffs

no code implementations4 Oct 2021 Beatriz Soret, Lam D. Nguyen, Jan Seeger, Arne Bröring, Chaouki Ben Issaid, Sumudu Samarakoon, Anis El Gabli, Vivek Kulkarni, Mehdi Bennis, Petar Popovski

An Intelligent IoT Environment (iIoTe) is comprised of heterogeneous devices that can collaboratively execute semi-autonomous IoT applications, examples of which include highly automated manufacturing cells or autonomously interacting harvesting machines.

Edge-computing Total Energy

Energy-Efficient Design for RIS-assisted UAVcommunications in beyond-5G Networks

no code implementations24 Sep 2021 Anay Ajit Deshpande, Cristian J. Vaca-Rubio, Salman Mohebi, Dariush Salami, Elisabeth de Carvalho, Petar Popovski, Stephan Sigg, Michele Zorzi, Andrea Zanella

The usage of Reconfigurable Intelligent Surfaces (RIS) in conjunction with Unmanned Ariel Vehicles (UAVs) is being investigated as a way to provide energy-efficient communication to ground users in dense urban areas.

Tesla-Rapture: A Lightweight Gesture Recognition System from mmWave Radar Point Clouds

no code implementations14 Sep 2021 Dariush Salami, Ramin Hasibi, Sameera Palipana, Petar Popovski, Tom Michoel, Stephan Sigg

To tackle this issue, we developed Tesla, a Message Passing Neural Network (MPNN) graph convolution approach for mmWave radar point clouds.

Gesture Recognition

Ground-Assisted Federated Learning in LEO Satellite Constellations

no code implementations3 Sep 2021 Nasrin Razmi, Bho Matthiesen, Armin Dekorsy, Petar Popovski

In Low Earth Orbit (LEO) mega constellations, there are relevant use cases, such as inference based on satellite imaging, in which a large number of satellites collaboratively train a machine learning model without sharing their local datasets.

Federated Learning

On Addressing Heterogeneity in Federated Learning for Autonomous Vehicles Connected to a Drone Orchestrator

no code implementations5 Aug 2021 Igor Donevski, Jimmy Jessen Nielsen, Petar Popovski

Thus, we propose a reactive method for the allocation of wireless resources, that happens dynamically each FL round, and is based on each learner's contribution to the general model.

Autonomous Vehicles Federated Learning

Channel Estimation for RIS-Aided Multiuser Millimeter-Wave Systems

no code implementations28 Jun 2021 Gui Zhou, Cunhua Pan, Hong Ren, Petar Popovski, A. Lee Swindlehurst

In the first coherence block, we propose a two-phase channel estimation method, in which the cascaded channel of one typical user is estimated in Phase I based on the linear correlation among cascaded paths, while the cascaded channels of other users are estimated in Phase II by utilizing the partial CSI of the common base station (BS)-RIS channel obtained in Phase I.

Age of Loop for Wireless Networked Control Systems Optimization

no code implementations1 Jun 2021 Pedro M. de Sant Ana, Nikolaj Marchenko, Petar Popovski, Beatriz Soret

Joint design of control and communication in Wireless Networked Control Systems (WNCS) is a promising approach for future wireless industrial applications.

IRS-Assisted Massive MIMO-NOMA Networks with Polarization Diversity

no code implementations27 May 2021 Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa, F. Rafael M. Lima, Liang Yang, Petar Popovski, Zhiguo Ding, Constantinos B. Papadias

In this paper, the appealing features of a dual-polarized intelligent reflecting surface (IRS) are exploited to improve the performance of dual-polarized massive multiple-input multiple-output (MIMO) with non-orthogonal multiple access (NOMA) under imperfect successive interference cancellation (SIC).

Energy-Efficient 3D Deployment of Aerial Access Points in a UAV Communication System

no code implementations27 Mar 2021 Nithin Babu, Constantinos B. Papadias, Petar Popovski

In this letter, we propose an energy-efficient 3-dimensional placement of multiple aerial access points (AAPs), in the desired area, acting as flying base stations for uplink communication from a set of ground user equipment (UE).

Semantic Communications in Networked Systems: A Data Significance Perspective

no code implementations9 Mar 2021 Elif Uysal, Onur Kaya, Anthony Ephremides, James Gross, Marian Codreanu, Petar Popovski, Mohamad Assaad, Gianluigi Liva, Andrea Munari, Touraj Soleymani, Beatriz Soret, Karl Henrik Johansson

We present our vision for a departure from the established way of architecting and assessing communication networks, by incorporating the semantics of information for communications and control in networked systems.

Decision Making

Seven Defining Features of Terahertz (THz) Wireless Systems: A Fellowship of Communication and Sensing

no code implementations15 Feb 2021 Christina Chaccour, Mehdi Naderi Soorki, Walid Saad, Mehdi Bennis, Petar Popovski, Merouane Debbah

Based on these fundamentals, we characterize seven unique defining features of THz wireless systems: 1) Quasi-opticality of the band, 2) THz-tailored wireless architectures, 3) Synergy with lower frequency bands, 4) Joint sensing and communication systems, 5) PHY-layer procedures, 6) Spectrum access techniques, and 7) Real-time network optimization.

Information Theory Information Theory

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.

Hidden Markov Model-Based Encoding for Time-Correlated IoT Sources

no code implementations19 Jan 2021 Siddharth Chandak, Federico Chiariotti, Petar Popovski

As the use of Internet of Things (IoT) devices for monitoring purposes becomes ubiquitous, the efficiency of sensor communication is a major issue for the modern Internet.

Networking and Internet Architecture 94A05 (Primary), 94B35, 62M05 (Secondary) E.4; H.1.1

Timely Monitoring of Dynamic Sources with Observations from Multiple Wireless Sensors

no code implementations22 Dec 2020 Anders E. Kalør, Petar Popovski

In this paper, we consider the problem of minimizing the AoI in a system in which a set of sources are observed by multiple sensors in a many-to-many relationship, and the probability that a sensor observes a source depends on the state of the source.

Information Theory Networking and Internet Architecture Information Theory

IRS-Assisted Massive MIMO-NOMA Networks: Exploiting Wave Polarization

no code implementations7 Dec 2020 Arthur S. de Sena, Pedro H. J. Nardelli, Daniel B. da Costa, F. Rafael M. Lima, Liang Yang, Petar Popovski, Zhiguo Ding, Constantinos B. Papadias

By considering the downlink of a multi-cluster scenario, the IRSs assist the base station (BS) to multiplex subsets of users in the polarization domain.

Assessing Wireless Sensing Potential with Large Intelligent Surfaces

no code implementations16 Nov 2020 Cristian J. Vaca-Rubio, Pablo Ramirez-Espinosa, Kimmo Kansanen, Zheng-Hua Tan, Elisabeth de Carvalho, Petar Popovski

By treating an LIS as a radio image of the environment relying on the received signal power, we develop techniques to sense the environment, by leveraging the tools of image processing and machine learning.

BIG-bench Machine Learning Denoising +1

IoT Wallet: Machine Learning-based Sensor Portfolio Application

no code implementations13 Nov 2020 Petar Šolić, Ante Lojić Kapetanović, Tomislav Županović, Ivo Kovačević, Toni Perković, Petar Popovski

Based on the type of the user, data can be viewed-only, controlled or the top user can register the sensor to the system.

BIG-bench Machine Learning

Band Assignment in Ultra-Narrowband (UNB) Systems for Massive IoT Access

no code implementations9 Oct 2020 Enes Krijestorac, Ghaith Hattab, Petar Popovski, Danijela Cabric

The objective is to find an assignment of BSs to multiplexing bands in order to maximize the packet decoding probability (PDP).

Antenna Selection for Improving Energy Efficiency in XL-MIMO Systems

no code implementations5 Sep 2020 José Carlos Marinello, Taufik Abrão, Abolfazl Amiri, Elisabeth de Carvalho, Petar Popovski

We consider the recently proposed extra-large scale massive multiple-input multiple-output (XL-MIMO) systems, with some hundreds of antennas serving a smaller number of users.

Total Energy

Review of the State-of-the-Art on Adaptive Protection for Microgrids based on Communications

no code implementations1 Jul 2020 Daniel Gutierrez-Rojas, Pedro H. J. Nardelli, Goncalo Mendes, Petar Popovski

The dominance of distributed energy resources in microgrids and the associated weather dependency require flexible protection.

Inter-Plane Inter-Satellite Connectivity in Dense LEO Constellations

no code implementations16 May 2020 Israel Leyva-Mayorga, Beatriz Soret, Petar Popovski

With numerous ongoing deployments owned by private companies and startups, dense satellite constellations deployed in low Earth orbit (LEO) will play a major role in the near future of wireless communications.

Networking and Internet Architecture

Witness-based Approach for Scaling Distributed Ledgers to Massive IoT Scenarios

no code implementations14 Apr 2020 Lam D. Nguyen, Israel Leyva-Mayorga, Petar Popovski

In our scheme, we classify transactions into two types: 1) global transactions, which must be processed by global blockchain nodes and 2) local transactions, which can be processed locally by entities called witnesses.

Networking and Internet Architecture Systems and Control Systems and Control

Trusted Wireless Monitoring based on Distributed Ledgers over NB-IoT Connectivity

no code implementations14 Apr 2020 Lam D. Nguyen, Anders E. Kalør, Israel Leyva-Mayorga, Petar Popovski

The data collected from Internet of Things (IoT) devices on various emissions or pollution, can have a significant economic value for the stakeholders.

Cryptography and Security Distributed, Parallel, and Cluster Computing

Peak Age of Information Distribution in Tandem Queue Systems

1 code implementation10 Apr 2020 Federico Chiariotti, Olga Vikhrova, Beatriz Soret, Petar Popovski

Age of Information is a critical metric for several Internet of Things (IoT) applications, where sensors keep track of the environment by sending updates that need to be as fresh as possible.

Networking and Internet Architecture 60K25, 68M20 C.2.2; G.3

Machine Learning Methods for Monitoring of Quasi-Periodic Traffic in Massive IoT Networks

no code implementations4 Feb 2020 René Brandborg Sørensen, Jimmy Jessen Nielsen, Petar Popovski

One of the central problems in massive Internet of Things (IoT) deployments is the monitoring of the status of a massive number of links.

BIG-bench Machine Learning Time Series

Low-Complexity Distributed XL-MIMO for Multiuser Detection

1 code implementation31 Jan 2020 Victor Croisfelt Rodrigues, Abolfazl Amiri, Taufik Abrão, Elisabeth de Carvalho, Petar Popovski

In this paper, the zero-forcing and regularized zero-forcing schemes operating in crowded extra-large MIMO (XL-MIMO) scenarios with a fixed number of subarrays have been emulated using the randomized Kaczmarz algorithm (rKA).

Spectrum Sharing for Massive Access in Ultra-Narrowband IoT Systems

no code implementations30 Jan 2020 Ghaith Hattab, Petar Popovski, Danijela Cabric

Ultra-narrowband (UNB) communications has become a signature feature for many emerging low-power wide-area (LPWA) networks.


Inference over Wireless IoT Links with Importance-Filtered Updates

no code implementations22 Jan 2020 Ivana Nikoloska, Josefine Holm, Anders Kalør, Petar Popovski, Nikola Zlatanov

We propose a data filtering scheme employed by the IoT nodes, which we refer to as distributed importance filtering in order to filter out redundant data samples already at the IoT nodes.

BIG-bench Machine Learning

Grant-Free Radio Access for Short-Packet Communications over 5G Networks

1 code implementation7 Sep 2017 Amin Azari, Petar Popovski, Guowang Miao, Cedomir Stefanovic

Radio access management plays a vital role in delay and energy consumption of connected devices.

Information Theory Information Theory

Distributed Proportional-Fairness Control in MicroGrids via Blockchain Smart Contracts

1 code implementation3 May 2017 Pietro Danzi, Marko Angjelichinoski, Čedomir Stefanović, Petar Popovski

Residential microgrids (MGs) may host a large number of Distributed Energy Resources (DERs).

Multiagent Systems

Distributed Estimation of the Operating State of a Single-Bus DC MicroGrid without an External Communication Interface

no code implementations14 Sep 2016 Marko Angjelichinoski, Anna Scaglione, Petar Popovski, Cedomir Stefanovic

We propose a decentralized Maximum Likelihood solution for estimating the stochastic renewable power generation and demand in single bus Direct Current (DC) MicroGrids (MGs), with high penetration of droop controlled power electronic converters.

A Random Access Protocol for Pilot Allocation in Crowded Massive MIMO Systems

1 code implementation14 Apr 2016 Emil Björnson, Elisabeth de Carvalho, Jesper H. Sørensen, Erik G. Larsson, Petar Popovski

The Massive MIMO (multiple-input multiple-output) technology has great potential to manage the rapid growth of wireless data traffic.

Information Theory Networking and Internet Architecture Information Theory

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