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100 results on '"Bader, Faouzi"'

3. Wireless Connectivity in the Sub-THz Spectrum: A Path to 6G

Author

Bica��s, Simon, Dor��, Jean-Baptiste, Saad, Majed, Alawieh, Mohammad, Bader, Faouzi, Palicot, Jacques, Corre, Yoann, Gougeon, Gregory, and Faussurier, Emmanuel

Subjects
Signal Processing (eess.SP), FOS: Electrical engineering, electronic engineering, information engineering, Electrical Engineering and Systems Science - Signal Processing
Abstract

Wireless communication in millimetre wave bands, namely above 20 GHz and up to 300 GHz, is foreseen as a key enabler technology for the next generation of wireless systems. The huge available bandwidth is contemplated to achieve high data-rate wireless communications, and hence, to fulfil the requirements of future wireless networks. In this paper, we discuss and illustrate new paradigms for the sub-THz physical layer, which either aim at maximizing the spectral efficiency, minimizing the device complexity, or finding good tradeoff. The solutions offered by appropriate modulation schemes and multi-antenna systems are assessed based on various potential scenarios.

Published
2022

7. Beyond LoRa and NB-IoT: Proposals for Future LPWA Systems

Author

Bader, Faouzi, Bader, Carlos, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Signal, Communication et Electronique Embarquée (SCEE), Institut d'Electronique et de Télécommunications de Rennes (IETR), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Université de Rennes (UNIV-RENNES), ANR-16-CE25-0002,EPHYL,Amélioration des formes d'onde des réseaux cellulaires basse puissance pour l'internet des objets(2016), Bader, Faouzi, Amélioration des formes d'onde des réseaux cellulaires basse puissance pour l'internet des objets - - EPHYL2016 - ANR-16-CE25-0002 - AAPG2016 - VALID, Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, ComputingMilieux_MISCELLANEOUS, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience

Published
2019

8. GNU Radio implementation for Multiuser Multi-Armed Bandit learning algorithms in IoT networks

Author

Manco-Vasquez, Julio, Moy, Christophe, Bader, Faouzi, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Signal, Communication et Electronique Embarquée (SCEE), Institut d'Electronique et de Télécommunications de Rennes (IETR), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Université de Rennes (UNIV-RENNES), CentraleSupélec, Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)

Subjects
ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], [INFO.INFO-IA]Computer Science [cs]/Computer Aided Engineering, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI]
Abstract

International audience; Novel access schemes based on multi-armed bandit (MAB) learning approaches has been proposed to support the increasing number of devices in IoT networks in unlicensed bands. In the present work, a GNU radio framework is implemented to recreate an IoT network where IoT devices embedding MAB algorithms are able to learn the availability of the channels for their packet transmissions to the gateway. It allows to incorporate several IoT users recognized by an identifier (ID), and provides a gateway to handle a large number of IDs as well as the packet collisions among IoT devices. The experimental results show that the introduction of decentralized learning mechanism in access schemes can improve the performance of the IoT devices, both in terms of energy consumption and spectrum overload, thanks to radio collision mitigation.

Published
2019

9. Low-Complexity Iterative Receiver for Orthogonal Chirp Division Multiplexing

Author

Manco-Vasquez, Julio, Bader, Faouzi, Bomfin, Roberto, Chafii, Marwa, Fettweis, Gerhard, Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Equipes Traitement de l'Information et Systèmes (ETIS - UMR 8051), Ecole Nationale Supérieure de l'Electronique et de ses Applications (ENSEA)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Technische Universität Dresden = Dresden University of Technology (TU Dresden), INEX ASIA, Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
Signal Processing (eess.SP), Minimum mean square error, Orthogonal frequency-division multiplexing, Computer science, 020208 electrical & electronic engineering, Fast Fourier transform, Equalizer, 020206 networking & telecommunications, 02 engineering and technology, Multiplexing, [SPI]Engineering Sciences [physics], Single antenna interference cancellation, Channel state information, Modulation, FOS: Electrical engineering, electronic engineering, information engineering, 0202 electrical engineering, electronic engineering, information engineering, Chirp, [INFO]Computer Science [cs], Electrical Engineering and Systems Science - Signal Processing, Algorithm, ComputingMilieux_MISCELLANEOUS, Communication channel
Abstract

This paper proposes a low-complexity iterative receiver for the recently proposed Orthogonal Chirp Division Multiplexing (OCDM) modulation scheme, where we consider a system under frequency-selective channels and constrained to channel state information availability only at the receiver. It has been shown that under these assumptions, OCDM becomes an optimal waveform in terms of performance, i.e., frame error rate (FER), when employing a receiver capable of achieving perfect feedback equalizer (PFE) performance. Thus, this work targets proposing such a receiver for OCDM with low-complexity. Our approach is based on the well accepted minimum mean squared error with parallel interference cancellation (MMSE-PIC), where we derive an approximated equalizer whose complexity is reduced to two fast Fourier transforms (FFTs) per iteration. The FER results reveal that i) the proposed low-complexity receiver perform as good as the original MMSE-PIC, ii) OCDM performs very closely to PFE, and iii) OCDM has approximately 2.5 dB improvement over OFDM.

Published
2019

10. Low Complexity Quasi-Optimal Detector for Generalized Spatial Modulation.

Author

Saad, Majed, Hijazi, Hussein, Ghouwayel, Ali Chamas Al, Bader, Faouzi, and Palicot, Jacques

Abstract

Generalized Spatial Modulation (GSM) is a promising technique for high data-rates systems where the complexity of the optimal joint detector based on the Maximum Likelihood (ML) criterion increases dramatically in terms of the modulation order and the number of activated transmit antennas. In this letter, a novel detection scheme for GSM systems denoted by O2SIC-ML is proposed to achieve the optimal performance with a controllable complexity-performance trade-off. The proposed detector is accompanied with ordering techniques for the transmit antenna combination and symbols to further reduce the complexity and improve the performance, respectively. The result reveals that O2SIC-ML allows reaching the non-linear ML detector performance with a 99% complexity reduction. [ABSTRACT FROM AUTHOR]

Published
2021
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11. Sub-Terahertz Wireless System Using Dual-Polarized Generalized Spatial Modulation With RF Impairments.

Author

Bouhlel, Nizar, Saad, Majed, and Bader, Faouzi

Subjects
TRANSMITTERS (Communication), FREQUENCY modulation transmitters, RICIAN channels, TELECOMMUNICATION systems, PHASE noise, TRANSMITTING antennas, RADIO frequency, DETECTORS
Abstract

In this paper, we address a multiple-input multiple-output (MIMO) communication system based on generalized spatial modulation (GSM) and dual-polarized (DP) antennas in sub-TeraHertz (sub-THz) bands to improve the Spectral Efficiency (SE) while reducing the spatial correlation effect and the space occupancy. Moreover, the joint Maximum Likelihood (ML) detector and a Modified Ordered Block Minimum Mean-Squared Error (MOB-MMSE) detector algorithm are proposed to detect jointly the complex symbols and the virtual bits conveyed by the activated polarization and the transmit antenna combination index. MOB-MMSE can achieve near-ML performance with low complexity. The performance of DP-GSM system over correlated Rayleigh/Rician fading and indoor sub-THz channels is studied. Provided results show that DP-GSM system is robust to the spatial correlation effects under Rician fading channel. In addition, an average bit-error probability (ABEP) upper bounding is derived and analyzed for the DP-GSM system over correlated Rayleigh/Rician fading channels. Since the sub-THz band suffers from many technological limitations and severe RF-impairments such as low transmit output power and important phase noise (PN), the DP-GSM system is studied by considering the sub-THz impairments. Moreover, the Dual Polarized Spatial Multiplexing (DP-SMX) and the Uni-Polarized GSM (UP-GSM) are compared with the DP-GSM system. The results reveal that DP-GSM with low order modulation schemes as QPSK outperforms the UP-GSM. Besides, DP-GSM and DP-SMX provide a good performance up to medium PN, which is interesting for sub-THz bands, but DP-GSM can reduce the transceiver cost by using a lower number of RF chains when the used transmitter architecture is based on RF-switching. [ABSTRACT FROM AUTHOR]

Published
2021
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12. FBMC Channel Estimation Techniques

Author

Kofidis, Eleftherios, Baltar, Leo G., Mestre, Xavier, Bader, Faouzi, and Savaux, Vincent

Abstract

FBMC/OQAM channel estimation has been a subject of extensive research for the last decade or so. Active research in this area is fueled by both the potential and interesting challenges underlying the application of this type of FBMC in a number of communication systems ranging from wireless cellular and ad hoc to wired networks. This chapter presents an overview of this fascinating subject with clear emphasis given to recent advances in the more challenging problem of highly frequency selective channel estimation. Both training (preamble or pilot)-based and (semi-)blind techniques are considered.

Published
2017

15. A Novel Index Modulation Dimension Based on Filter Domain: Filter Shapes Index Modulation.

Author

Saad, Majed, Palicot, Jacques, Bader, Faouzi, Ghouwayel, Ali Chamas Al, and Hijazi, Hussein

Subjects
FILTER banks, PHASE modulation, AMPLITUDE modulation, ENERGY consumption
Abstract

A novel domain for Index Modulation (IM) named “Filter Domain” is proposed. This new domain generalizes many existing modulations and IM domains. In addition, a novel scheme “Filter Shape Index Modulation” (FSIM) is proposed. This FSIM scheme allows a higher Spectral Efficiency (SE) gain than the time and frequency IM dimensions in Single-Input Single-Output (SISO) systems. In the FSIM system, the bit-stream is mapped using an Amplitude Phase Modulation (APM) as QAM or PSK, and an index of a filter-shape changing at the symbol rate. This filter shape, being changed at each symbol, enables a SE gain in SISO system without sacrificing any time or frequency resources. Compared to an equivalent 8QAM and 16QAM schemes and at the same SE, the FSIM with QPSK using 2 and 4 non-optimal filter shapes achieves a gain of 3.8 dB and 1.7 dB respectively at BER= 10−4, and this superiority is maintained in frequency selective fading channel compared to equivalent SISO-IM schemes. A low complexity detection scheme, approaching the maximum likelihood detector performance, is proposed along with a full performance characterization in terms of theoretical probability of filter index error and BER lower bound. Finally, FSIM can achieve better spectral and energy efficiencies when a filter bank and an ISI cancellation technique are optimally designed. [ABSTRACT FROM AUTHOR]

Published
2021
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20. ACCENTS: a Vision for D2D Communications within 5G Networks

Author

Bader, Faouzi, Bodinier, Quentin, Rousset, Olivier, Untersee, Alain, Dziri, Aii, Rostom Zakaria, Pischella, Mylene, Iacobelli, Lorenzo, Bourrous, Anael, Conservatoire National des Arts et Métiers [CNAM] (CNAM), Centre d'études et de recherche en informatique et communications (CEDRIC), Ecole Nationale Supérieure d'Informatique pour l'Industrie et l'Entreprise (ENSIIE)-Conservatoire National des Arts et Métiers [CNAM] (CNAM), Teamcast, Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), French National Research Agency (ANR) through the ACCENTS project [ANR-14-CE28-0026-01], ANR-14-CE28-0026,ACCENT5,Formes d'onde avancées, MAC et allocation dynamique de ressource radio pour les communications directes de terminal à terminal dans les réseaux 5G(2014), Université de Nantes (UN)-Université de Rennes 1 (UR1), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
Research agency, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, LTE Networks, Medium access control, Network layers, [SPI.TRON]Engineering Sciences [physics]/Electronics, Deviceto-device (D2D) communication, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 5G mobile communication systems, Mobile telecommunication systems, D2D communications, Queueing networks, Design and dynamics, Wireless telecommunication systems, Thales Communications, Physical layers, Radio resource allocation
Abstract

International audience; The paper presents the studies that have been led toward the integration of device-to-device (D2D) communications within LTE networks in the frame of the project ACCENTS (Advanced Waveforms, MAC Design and Dynamic Radio Resource Allocation for Device-to-Device in SG Wireless Networks) supported by the French National Research Agency. The solutions presented in this paper cover several aspects of D2D communications; they are the result of a close cooperation between four partners: Thales Communications and Security, CNAM, TeamCast and CentraleSupelec. Physical Layer aspects have been investigated, especially concerning waveforms envisioned for D2D communications within SG networks. Also, a new MAC protocol has been designed to address the issues raised by the integration of D2D transmissions within LTE cells. The solution coming out of the study guarantees a minimum QoS for both types of users (D2D users and regular users) and aims at reusing spectrum while offloading the burden on the base station.

Published
2017

21. Orthogonal Waveforms and Filter Banks for Future Communication Systems

Author

Renfors, Markku, Mestre, Xavier, Kofidis, Eleftherios, and Bader, Faouzi

Abstract

Orthogonal Waveforms and Filter Banks for Future Communication Systems provides an up-to-date account of orthogonal filter bank-based multicarrier (FBMC) systems and their applications in modern and future communications, highlighting the crucial role that advanced multicarrier waveforms play. It is an up-to-date overview of the theory, algorithms, design and applications of FBMC systems at both the link- and system levels that demonstrates the various gains offered by FBMC over existing transmission schemes via both simulation and test bed experiments. Readers will learn the requirements and challenges of advanced waveform design for future communication systems, existing FBMC approaches, application areas, and their implementation. In addition, the state-of-the-art in PHY- and MAC-layer solutions based on FBMC techniques, including theoretical, algorithmic and implementation aspects are explored.

Published
2017
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22. Future evolution of public safety communications in the 5G Era

Author

Bader, Faouzi, Martinod, Laurent, Baldini, Gianmarco, Frantz, Fred, Kandeepan, Sithamparanathan, Sallent, Oriol, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Airbus Defence and Space, Airbus Group, Joint Research center, European Commission, Engility Corporation, RMIT University [Melbourne], The School of Computer Science and IT, Universitat Politècnica de Catalunya [Barcelona] (UPC), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Airbus Defence and Space [Les Mureaux], ASTRIUM, and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

23. Signal Processing for Future Multicarrier Systems

Author

Bader, Faouzi, Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Signal, Communication et Electronique Embarquée (SCEE), Institut d'Electronique et de Télécommunications de Rennes (IETR), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Université de Rennes (UNIV-RENNES), Université Rennes 1, Eric Pottier(eric.pottier@univ-rennes1.fr), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
traitement du signal, systèmes de communications multiporteuses, signal processing, Multicarrier systems, telecommunication networks, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, OFDM
Published
2016

24. Spectral Coexistence of LDACS and DME: Analysis via Hardware Software Co-Design in Presence of Real Channels and RF Impairments.

Author

Agrawal, Niharika, Darak, Sumit J., and Bader, Faouzi

Subjects
ORTHOGONAL frequency division multiplexing, BIT error rate, WIRELESS channels, AERONAUTICAL communications systems, SYSTEMS on a chip, FIELD programmable gate arrays, DIGITAL communications
Abstract

To meet the exponentially increasing air traffic, L-band (960--1164 MHz) digital aeronautical communication system (LDACS) has been introduced. The LDACS aims to exploit the vacant spectrum between incumbent Distance Measuring Equipment (DME) signals and envisioned to follow an orthogonal frequency division multiplexing (OFDM) approach to support high-speed delay-sensitive multimedia services. This paper deals with the design and implementation of end-to-end LDACS the transceiver on the Zynq System on Chip platform, consisting of FPGA as programmable logic (PL) and ARM as processing system (PS). We consider OFDM based LDACS and improve it further using windowing and/or filtering. We propose a hardware-software co-design approach and analyze various transceiver configurations by dividing it into PL and PS. We demonstrate the flexibility offered by such a co-design approach to choose the configuration as well as word-length for a given area, delay and power constraints. The transceiver is also integrated with the programmable analog front-end to validate its functionality in the presence of various RF impairments and wireless channels and interference specific to the LDACS environment. Via in-depth performance analysis concerning parameters such as out-of-band attenuation, DME interference, bit-error-rate, word-length, and complexity, we demonstrate wide bandwidth filtered OFDM as an attractive solution for the next generation LDACS. [ABSTRACT FROM AUTHOR]

Published
2020
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25. Modified Tone Reservation for Peak-to-Average Power Ratio on OFDM systems

Author

Diallo, Lamarana Mamadou, Chafii, Marwa, Palicot, Jacques, Bader, Faouzi, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), ANR-10-LABX-0007,COMIN Labs,Digital Communication and Information Sciences for the Future Internet(2010), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; One of the main drawbacks of orthogonal frequency division multiplex modulation is its high peak-to-average power ratio (PAPR) which can induce poor power efficiency at high power amplifier. Tone reservation (TR) is the most popular PAPR mitigation technique that uses a set of reserved tones to design peak cancelling signal for PAPR reduction. Finding an effective peak cancelling for PAPR reduction in the time domain by using only a small number of reserved tones, is not straightforward. Therefore, we are led to a trade-off between computational complexity and PAPR reduction. The TR method based on the gradient projection algorithm gives the best compromise. In this paper, we propose to modify the classical TR structure. The new proposed method achieves an improvement up to$1.2 dB in terms of PAPR performance without increasing the complexity. The effectiveness of this solution is confirmed through theoretical analysis and simulation results.

Published
2016

26. OFDM/OQAM Blind Equalization Using CNA Approach OFDM/OQAM Blind Equalization Using CNA Approach

Author

Savaux, Vincent, Palicot, Jacques, Bader, Faouzi, Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
Blind equalization, OFDM/OQAM, CNA, impulse noise cancellation, CMA, Iterative Methods, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; This paper deals with blind equalization based on the constant norm algorithm (CNA) in orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM). The CNA is designed to fit the complex square constellations with high order. As a consequence, the received signal is reshaped in order to change the real OQAM symbols into complex ones. Although it increases the intrinsic interferences of the OFDM/OQAM signal, it is proved by analysis and through simulations that the CNA with proposed reshaped signal achieves better mean square error (MSE) performance than CMA applied to the received OFDM/OQAM signal. Furthermore, a sub-optimal initialization strategy is proposed, which ensures a high convergence speed. The behavior of the proposed blind equalization method is analyzed under synchronization mismatch as well as in time-varying propagation environment.

Published
2016

27. A Step Forward on Adaptive Iterative Clipping Approach for PAPR Reduction in OFDM System

Author

diallo, lamarana mamadou, Palicot, Jacques, Bader, Faouzi, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

IARIA; International audience; The Orthogonal Frequency Division Multiplexing (OFDM) is the most commonly used multicarrier modulation in telecommunication systems because of its efficient use of frequency resources and its robustness to multipath fading channels. However, as any multicarrier signal, the Peak-to-Average-Power Ratio (PAPR) is one of the major drawbacks of OFDM signals. Many research papers have dealt with the PAPR mitigation methods, such as clipping methods, tone reservation based approaches, and partial transmit signals. However, in this paper we focus on the clipping method. This method is one of the most efficient adding signal techniques for PAPR reduction in terms of complexity. Nevertheless, clipping presents manydrawbacks such as a bit error rate degradation, an out-of-band emission, and a mean power degradation. In this paper, a clippingmethod featuring a threshold that adapts to the desired upper bounded output PAPR is presented. Once the desired output PAPR has been predefined, the proposed AC approach consists of clipping each OFDM symbol with an adaptive threshold so that the PAPR value of the clipped symbol is equal to this desired output PAPR. This paper proposes three different ways to compute the adaptive threshold of each OFDM symbol we want to clip according to the desired output PAPR. The theoretical analysis and the simulation results validate the interest and potential of this new clipping method.

Published
2016

28. Achieving a desired deterministic upper bounded PAPR value using a fast adaptive clipping algorithm

Author

Diallo, Mamadou Lamanara, Palicot, Jacques, Bader, Faouzi, Institut d'Electronique et de Télécommunications de Rennes (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI]Engineering Sciences [physics], Orthogonal frequency division multiplexing, Frequency division multiplexing, Tone reservation, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

29. Cognitive Radio and Networking for Heterogeneous Wireless Networks

Author

Di Benedetto, Maria-Gabriella, Cattoni, Andrea, Fiorina, Jocelyn, Bader, Faouzi, De Nardis, Luca, Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Laboratoire des signaux et systèmes (L2S), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
[SPI]Engineering Sciences [physics], [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; This book, written by leading experts from academia and industry, offers a condensed overview on hot topics among the Cognitive Radios and Networks scientific and industrial communities (including those considered within the framework of the European COST Action IC0902) and presents exciting visions for the future. Examples of the subjects considered include the design of new filter bank-based air interfaces for spectrum sharing, medium access control design protocols, the design of cloud-based radio access networks, an evolutionary vision for the development and deployment of cognitive TCP/IP, and regulations relevant to the development of a spectrum sharing market. The concluding chapter comprises a practical, hands-on tutorial for those interested in developing their own research test beds. By focusing on the most recent advances and future avenues, this book will assist researchers in understanding the current issues and solutions in Cognitive Radios and Networks designs.

Published
2015

30. New Spectrum Efficient Reconfigurable Filtered-OFDM Based L-Band Digital Aeronautical Communication System.

Author

Agrawal, Niharika, Darak, Sumit J., and Bader, Faouzi

Subjects
DIGITAL communications, AERONAUTICAL communications systems, ORTHOGONAL frequency division multiplexing, FIELD programmable gate arrays, QUALITY of service
Abstract

To meet an ever-increasing demand of the spectrum for aeronautical communication, we propose new L-band digital aeronautical communication system using reconfigurable filtered orthogonal frequency division multiplexing. The proposed protocol enables transceivers to dynamically adapt the transmission bandwidth over a wide range to meet the desired quality of service, and high out-of-band attenuation leads to significant improvement in the vacant spectrum utilization. We support our claims via simulation and complexity comparison results for various realistic channel conditions. [ABSTRACT FROM AUTHOR]

Published
2019
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31. Advances on Processing for Multiple Carrier Schemes: OFDM & OFDMA

Author

Zorba, Nizar, Bader, Faouzi, Zorba, Nizar, and Bader, Faouzi

Subjects
Orthogonal frequency division multiplexing, Multiple access protocols (Computer network protoc
Abstract

Orthogonal frequency-division multiplexing (OFDM) has existed for many years, but it has recently acquired a huge momentum as an emerging technology for high data rates. This technology has quickly moved from books and lectures to be a key technique within almost all wireless commercial broadband technologies.OFDM stands as a low complexity and high efficiency way to deal with the channel frequency selectivity by dividing the channel into a large set of subchannels, each one of them showing flat fading characteristics. Therefore, OFDM is a multi-carrier transmission technique that makes the communication to be robust against large delay spreads by keeping the orthogonality in the frequency domain. This book presents current research on the advantages and disadvantages of OFDM.

Published
2012

32. Adaptive Wavelet Packet Modulation.

Author

Chafii, Marwa, Palicot, Jacques, Gribonval, Remi, and Bader, Faouzi

Subjects
ELECTRONIC modulation, BANDWIDTHS, DATA transmission systems, ORTHOGONAL frequency division multiplexing, NYQUIST frequency
Abstract

In this paper, we propose a new adaptive modulation based on the wavelet packet transform, which targets a good resistance against frequency selective channels while avoiding a large PAPR. Classical multi-carrier modulation schemes divide the channel bandwidth into narrowband sub-channels to improve its robustness against frequency selective fading. However, they suffer from the peak-to-average power ratio (PAPR) problem, which occurs due to a random constructive addition of sub-carriers. By contrast, single carrier modulation schemes, where each transmitted symbol fully occupies the bandwidth, are more sensitive to frequency selective environments and less affected by the PAPR problem. In this paper, we show how the bandwidth division can be reconfigurable and adapted to the channel properties, and we provide several examples to prove that the proposed adaptive modulation represents an alternative modulation which is adjustable between two extreme cases: single carrier modulation and classical multi-carrier modulation. [ABSTRACT FROM AUTHOR]

Published
2018
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33. Editorial: Simulators and Experimental Testbeds Design and Development for Wireless Networks

Author

Bader, Faouzi, Chelius, Guillaume, Ibars, Christian, Ibnkahla, Mohamed, Passas, Nikos, Rhiemeier, Arnd-Ragnar, Centre Tecnològic de Telecomunicacions de Catalunya = Telecommunications Technological Centre of Catalonia (CTTC), Dynamic Networks (DNET), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Department of Electrical and Computer Engineering [Queen's University Kingston], Queen's University [Kingston, Canada], Communication Networks Laboratory [Athens], Department of Informatics & Telecommunications, University of Athens, EADS Innovation Works [Toulouse], EADS - European Aeronautic Defense and Space, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

39. Contributors

Author

Abdelaziz, Mahmoud, Anttila, Lauri, Bader, Faouzi, Baltar, Leonardo Gomes, Baptiste Doré, Jean, Bartzoudis, Nikolaos, Berg, Vincent, Bulusu, Krishna, Caus, Màrius, Chandra, Ranveer, Chen, Xiaofei, Cheng, Yao, Chevalier, Pascal, Doré, Jean-Baptiste, Fettweis, Gerhard, Fickers, Jessica, Font-Bach, Oriol, Fuhrwerk, Martin, Gaspar, Ivan, Gorza, Simon-Pierre, Gregoratti, David, Gruet, Christophe, Haardt, Martin, Harris, Fred, Horlin, François, Kofidis, Eleftherios, Kténas, Dimitri, Le Ruyet, Didier, Lopez Bueno, David, Louveaux, Jérôme, Martinod, Laurent, Mattera, Davide, Mège, Philippe, Mestre, Xavier, Mueck, Markus, Myrvoll, Tor André, Nguyen, Trung-Hien, Noguet, Dominique, Passas, Nikos, Pérez-Neira, Ana I., Petrov, Dmitry, Pischella, Mylène, Pons-Masbernat, Xavier, Renfors, Markku, Ringset, Vidar, Rottenberg, François, Roviras, Daniel, Savaux, Vincent, Schaich, Frank, Shaiek, Hmaied, Siohan, Pierre, Tanda, Mario, Tsolkas, Dimitris, Venosa, Elettra, Wild, Thorsten, Wunder, Gerhard, Yli-Kaakinen, Juha, Zakaria, Rostom, and Zayani, Rafik

Published
2017
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44. A Necessary Condition for Waveforms With Better PAPR Than OFDM.

Author

Chafii, Marwa, Palicot, Jacques, Gribonval, Remi, and Bader, Faouzi

Subjects
WAVE analysis, ORTHOGONAL frequency division multiplexing, MULTI-carrier modulation, FOURIER transforms, MATHEMATICAL optimization
Abstract

This paper establishes a necessary condition that must be satisfied by the modulation waveforms of any generalized waveforms for multicarrier (GWMC) system with better peak-to-average power ratio (PAPR) than conventional orthogonal frequency division multiplexing (OFDM). GWMC systems include in particular all classical multicarrier modulation systems. As a consequence, we show that OFDM has the best PAPR performance over all GWMC systems that do not satisfy this necessary condition. We also identify an infinite family of GWMC systems with the same PAPR performance as OFDM. To illustrate our results, we present the simulations of the PAPR behavior for different GWMC systems, including some with better PAPR performance than OFDM. [ABSTRACT FROM AUTHOR]

Published
2016
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45. OFDM/OQAM Blind Equalization <?Pub _newline ?>Using CNA Approach.

Author

Savaux, Vincent, Bader, Faouzi, and Palicot, Jacques

Subjects
*BLIND equalization (Singla processing), *SYNCHRONIZATION, *RADIO wave propagation, *MULTIPHASE flow, *FOURIER transform spectroscopy
Abstract

This paper deals with blind equalization based on the constant norm algorithm (CNA) in orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM). The CNA is designed to fit the complex square constellations with high order. As a consequence, the received signal is reshaped in order to change the real OQAM symbols into complex ones. Although it increases the intrinsic interferences of the OFDM/OQAM signal, it is proved by analysis and through simulations that the CNA with proposed reshaped signal achieves better mean square error (MSE) performance than CMA applied to the received OFDM/OQAM signal. Furthermore, a suboptimal initialization strategy is proposed, which ensures a high convergence speed. The behavior of the proposed blind equalization method is analyzed under synchronization mismatch as well as in time-varying propagation environment. [ABSTRACT FROM PUBLISHER]

Published
2016
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46. Interference Alignment With Frequency-Clustering for Efficient Resource Allocation in Cognitive Radio Networks.

Author

El-Absi, Mohammed, Shaat, Musbah, Bader, Faouzi, and Kaiser, Thomas

Abstract

In this paper, we investigate the resource management problem in orthogonal frequency division multiplexing (OFDM) based multiple-input multiple-output (MIMO) cognitive radio (CR) systems. We propose performing resource allocation based on interference alignment (IA) in order to improve the spectral efficiency of CR systems without affecting the quality of service of the primary system. IA plays a role in the proposed algorithm to enable the secondary users (SUs) to cooperate and share the available spectrum, which leads to a considerable increase in the spectral efficiency of CR systems. However, IA based spectrum sharing is restricted to a certain number of SUs per subcarrier in order to satisfy the IA feasibility conditions. Accordingly, the resource allocation problem is formulated as a mixed-integer optimization problem, which is considered an \mathcalNP-hard problem. To reduce the computational complexity of the problem, a two-phases efficient sub-optimal algorithm is proposed. In the first phase, frequency-clustering is performed in order to satisfy the IA feasibility conditions, where each subcarrier is assigned to a feasible number of SUs. Whenever possible, frequency-clustering stage considers the fairness among the SUs. In the second stage, the available power is allocated among the subcarriers and SUs without violating the constraints that limit the maximum interference induced to the primary system. Simulation results show that IA with frequency-clustering achieves a significant sum rate increase compared to CR systems with orthogonal multiple access transmission techniques. [ABSTRACT FROM PUBLISHER]

Published
2015
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47. A Joint MMSE Channel and Noise Variance Estimation for OFDM/OQAM Modulation.

Author

Savaux, Vincent, Bader, Faouzi, and Louet, Yves

Subjects
*ACOUSTIC transients, *MULTIPLEXING, *INTERFERENCE (Telecommunication), *RADIO interference, *TRANSIENTS (Dynamics)
Abstract

This paper deals with the minimum mean square error (MMSE)-based multipath channel and noise variance estimation in the case of a pilot-aided orthogonal frequency division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) system. The theoretical expression of the LMMSE channel estimation is formulated and a simpler closed-form is derived. The MSE analysis shows that LMMSE inevitably reaches an error floor due to the interference inherent to OFDM/OQAM modulation. Furthermore, an algorithm for the joint MMSE estimation of both the channel and the noise variance (J-MCNE) is proposed and features a reduced complexity thanks to the low-rank approximation method. The noise level estimation represents a challenge as it is concealed in the intrinsic interferences generated by the OFDM/OQAM. Simulations reveal the capability of the proposed J-MCNE method to estimate the noise variance and show that the achieved bit error rate (BER) is close to that of the perfect estimation. [ABSTRACT FROM PUBLISHER]

Published
2015
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