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14 results on '"Frederic Challita"'

1. Line-of-Sight Massive MIMO Channel Characteristics in an Indoor Scenario at 94 GHz

Author

Frederic Challita, Maria-Teresa Martinez-Ingles, Martine Lienard, Jose-Maria Molina-Garcia-Pardo, and Davy P. Gaillot

Subjects
Millimeter wave, massive MIMO, indoor propagation, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

The fading and correlation characteristics of virtual, yet realistic, line-of-sight (LOS) 4 × 2500 millimetric (mmW) massive MIMO channels are investigated at 94 GHz in an indoor office environment for three different Tx-Rx distance scenarios. The capability of the mmW massive MIMO channel to spatially decorrelate the users is evaluated with the computation of the channel correlation and other channel metrics, such as power-to-interference ratio and condition number. In particular, the correlation between channel vectors for a given user and its influence on receiving correlation is discussed. The results clearly demonstrate the capability of mmW massive MIMO systems to reach orthogonal Tx-Rx streams even for a small 7 × 7 antenna array subset with correlation between users

Published
2018
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2. Autoregressive Modeling Approach for Non-Stationary Vehicular Channel Simulation

Author

Marwan Yusuf, Emmeric Tanghe, Frederic Challita, Pierre Laly, Luc Martens, Davy P. Gaillot, Martine Lienard, Wout Joseph, Interuniversity Microelectronics Centre (IMEC), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Plateforme de Caractérisation Multi-Physiques - IEMN (PCMP - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), and PCMP C2EM

Subjects
Mathematical models, Technology and Engineering, VEHICLE, communication, Computer Networks and Communications, non-stationary, Aerospace Engineering, Computational modeling, vehicular communication, Technological innovation, WIDE-BAND, Doppler effect, Correlation, Time-frequency analysis, [SPI]Engineering Sciences [physics], Vehicular, channel modeling, autoregressive, Automotive Engineering, Delays, Electrical and Electronic Engineering, 5G
Abstract

International audience; A framework is proposed for long-term vehicular channel simulation based on the vector time-frequency autoregressive (VTFAR) model for a sparse parametric description of nonstationary multivariate random processes. Based on vehicle-to-infrastructure tunnel measurements, we estimate the VTFAR model parameters and validate the model by comparing the parametric and non-parametric spectra of the measured channel in terms of the delay spread and stationarity time. In addition, the VTFAR model stability is investigated and an approximation for the correlated scattering channel is proposed. The experimental validation shows a good agreement with RMSE of only 0.01 for the delay spread and 0.4 for the stationarity time. This approach provides an efficient alternative for non-stationary channel simulation that is measurement-based and computationally inexpensive.

Published
2022
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3. Experimental Study on the Impact of Antenna Characteristics on Non-Stationary V2I Channel Parameters in Tunnels

Author

Wout Joseph, Rafael Berkvens, Maarten Weyn, Frederic Challita, Marwan Yusuf, Bart Lannoo, Pierre Laly, Emmeric Tanghe, Martine Lienard, Davy P. Gaillot, Rreze Halili, Luc Martens, Interuniversity Microelectronics Centre (IMEC), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), University of Antwerp (UA), VLAIO project 'Smart Highway', EOS project 'Multi-serviceWireless Network (MUSE-WINET)', PCMP C2EM, and Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN)

Subjects
Technology and Engineering, POLARIZATION, Economics, delay, Computer Networks and Communications, DIVERSITY, Aerospace Engineering, PROPAGATION, 02 engineering and technology, Antenna measurements, Multiplexing, CAPACITY, doppler, Radiation pattern, [SPI]Engineering Sciences [physics], Channel capacity, symbols.namesake, 0203 mechanical engineering, GHZ, Vehicular, Frequency measurement, propagation, MIMO communication, Delays, Electrical and Electronic Engineering, tunnel, Computer Science::Information Theory, Mathematics, UNDERGROUND MINES, polarization, Directional antenna, MIMO normalization, Mathematical analysis, 020302 automobile design & engineering, Doppler effect, Correlation, MIMO WIRELESS CHANNEL, stationarity, Automotive Engineering, Log-normal distribution, Mass communications, symbols, Antennas, measurement, Engineering sciences. Technology, SYSTEM, Multipath propagation, Communication channel
Abstract

International audience; This paper analyses the experimentally-assessed dual-polarized (DP) mobile channel in a tunnel environment at 1.35 GHz under traffic conditions. We investigate the impact of antenna polarization and radiation pattern on the non-stationary vehicle-to-infrastructure (V2I) channel. Basic channel evaluation metrics are examined including path gain, co-polarization ratio (CPR), and cross-polarization discrimination (XPD). In addition, the stationarity region is estimated using the channel correlation function approach, and used to calculate the time-varying delay and Doppler power profiles. Statistical models are presented for parameters like CPR, XPD, RMS delay and Doppler spreads, where the lognormal distribution provides the best fit. The polarization and the opening angle of the antennas into the propagation channel are found to strongly influence the observed non-stationarity of the channel. They impact the degree of multipath richness that is captured, thus providing different path gain, delay and Doppler spreads. Based on our analysis, the directional antenna with vertical polarization provides the longest stationarity time of 400 ms at 90 km/h, as well as the highest path gain and lowest dispersion. Furthermore, the DP channel capacity is calculated and its dependence on different normalization approaches is investigated. We propose a more accurate normalization for the DP channels that takes the conservation of energy into account. Moreover, the subchannels correlation coefficients are determined. While the condition number is found to be low on average, the correlation results show high correlation among the DP subchannels. As conclusion, we show how the CPR and XPD play the main role in providing multiplexing gain for DP tunnel channels.

Published
2020
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4. Experimental characterization of non-stationary V2I radio channel in tunnels

Author

Marwan Yusuf, Frederic Challita, Emmeric Tanghe, Luc Martens, Wout Joseph, Davy P. Gaillot, Pierre Laly, Martine Lienard, Interuniversity Microelectronics Centre (IMEC), Department of Information Technology, Universiteit Gent = Ghent University (UGENT)-iminds, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), PCMP C2EM, Universiteit Gent = Ghent University [Belgium] (UGENT)-iminds, and Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE)

Subjects
Physics, Technology and Engineering, Process (computing), 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, Characterization (materials science), symbols.namesake, [SPI]Engineering Sciences [physics], Amplitude, 0203 mechanical engineering, Rician fading, Log-normal distribution, 0202 electrical engineering, electronic engineering, information engineering, symbols, Computer Science::Networking and Internet Architecture, Radio channel, Fading, Statistical physics, Doppler effect
Abstract

International audience; The fading process in vehicular communications is inherently non-stationary. In this paper, vehicle-to-infrastructure (V2I) radio channel measurements are performed inside a tunnel for low and medium traffic conditions to estimate the stationarity time, in addition to the time-varying RMS delay and Doppler spreads. Furthermore, we show the good fit of the spreads to a lognormal distribution, as well as for the Rician K-factor of the fading amplitude. From our analysis we conclude that the traffic density has an impact on the large-scale parameters as it increases delay and Doppler spreads, while reducing the correlation between them as well as the average K-factor. Larger traffic densities may be required to impact the stationarity time.

Published
2020
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5. Massive MIMO communication strategy using polarization diversity for industrial scenarios

Author

Frederic Challita, Wout Joseph, Emmeric Tanghe, Martine Lienard, Pierre Laly, Marwan Yusuf, Pierre Degauque, Davy P. Gaillot, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Universiteit Gent = Ghent University [Belgium] (UGENT), Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), PCMP C2EM, Universiteit Gent = Ghent University (UGENT), and Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN)

Subjects
Technology and Engineering, receiving antenna (Rx) spatial correlation, Industry 4, Industry 4.0, Computer science, MIMO, 02 engineering and technology, Precoding, [SPI]Engineering Sciences [physics], CHANNEL, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wireless, Electrical and Electronic Engineering, WIRELESS, Polarization diversity, ComputingMilieux_MISCELLANEOUS, Computer Science::Information Theory, polarization diversity, business.industry, Transmitter, 020206 networking & telecommunications, Polarization (waves), massive multiple-input-multiple-output (MIMO), business, Communication channel
Abstract

In this letter, a polarization diversity technique applied to massive multiple-input-multiple-output (MIMO) in an industrial environment is proposed. The main idea is to use dual-polarized elements at the fixed array and to adequately choose their polarization for each communication channel between this array and a given user. For the same number of antenna ports, such a configuration allows decreasing, by a factor of 2, the geometrical size of the array and, thus, minimizing the spatial nonstationarity over the array. Performance of this approach is evaluated in terms of the sum-rate capacity assuming either a maximum ratio transmitter or a zero-forcing precoding and is based on channel matrices measured at 3.5 GHz in an industrial hall.

Published
2020
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6. Massive radio channel sounder architecture for 5G mobility scenarios : MaMIMOSA

Author

Martine Lienard, Luc Martens, Eric Pierre Simon, Günter Vermeeren, Frederic Challita, Wout Joseph, Gauthier Delbarre, Pierre Laly, Emmeric Tanghe, M. Van den Bossche, Davy P. Gaillot, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Plateforme de Caractérisation Multi-Physiques - IEMN (PCMP - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Department of Information Technology (INTEC), Universiteit Gent = Ghent University [Belgium] (UGENT), OS4 SMARTIES research program by the ELSAT2020 project - European Union, European Regional Development FundEuropean Commission, French state, Hauts-de-France Region Council, PCMP C2EM, Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Universiteit Gent = Ghent University (UGENT)

Subjects
Technology and Engineering, Computer science, business.industry, 020208 electrical & electronic engineering, MIMO, Bandwidth (signal processing), Electrical engineering, Binary number, 020206 networking & telecommunications, 02 engineering and technology, Software-defined radio, 7. Clean energy, Multiplexing, Antenna array, Massive MIMO channel sounding, [SPI]Engineering Sciences [physics], propagation, 0202 electrical engineering, electronic engineering, information engineering, V2X, Wireless, measurements, business, WIRELESS, 5G
Abstract

International audience; This paper presents a real-time 64 x 16 massive MIMO channel sounder based on space-frequency division multiplexing and antenna subarray switching, giving a large possibility of antenna allocation and frequency tone between 2 and 12 GHz. This channel sounder called Massive MIMOSA or MaMIMOSA belongs to the new generation of software radio design based systems. The architecture of the proposed approach was designed with the highest flexibility thus opening a wide range of applications depending upon the investigated scenarios. Currently, the system is being setup using a massive 10 x 10 antenna array operating around 6 GHz with 80 MHz bandwidth for SG V2X applications. The channel sounder can be powered with vehicle batteries to perform day long measurements when electrical outlets are not available. The output file gives the measured Massive MIMO matrix in a friendly compact binary format. It will be operational in early 2020.

Published
2020
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7. On the Contribution of Dense Multipath Components in an Intrawagon Environment for 5G mmW Massive MIMO Channels

Author

Juan Pascual-Garcia, Frederic Challita, Juan Reig, Davy P. Gaillot, Martine Lienard, Leandro Juan-Llacer, Lorenzo Rubio, Jose-Maria Molina-Garcia-Pardo, Vicent M. Rodrigo-Penarrocha, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Dpto. Tecnologías de la Información y las Comunicaciones, Universidad Politécnica de Cartagena / Technical University of Cartagena (UPCT), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Technical University of Cartagena (UPTC), and Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE)

Subjects
Dense multipath components (DMC), Spatial correlation, Monte Carlo method, MIMO, 02 engineering and technology, Topology, Antenna measurements, Radio spectrum, Massive multiple-input--multiple-output (MIMO), [SPI]Engineering Sciences [physics], Frequency measurement, 5G mobile communication, TEORIA DE LA SEÑAL Y COMUNICACIONES, 0202 electrical engineering, electronic engineering, information engineering, Point (geometry), Specular reflection, Antenna arrays, Electrical and Electronic Engineering, Computer Science::Information Theory, Physics, 020206 networking & telecommunications, Monte Carlo methods, Multiuser channels, Correlation, 5G, Multipath propagation
Abstract

[EN] In this letter, the dependence of the specular multipath components (SMC) and dense multipath components (DMC) to the interuser spatial correlation and sum-rate capacity of a massive multiuser multiple-input--multiple-output (MU-MIMO) setup is evaluated from measurements conducted inside an underground subway wagon at the 25-40 GHz candidate frequency bands for 5G systems. The radio channel consists in a 7 7 uniform rectangular array (URA) acting as access point for eight users uniformly distributed in the wagon. The DMC power ratio is observed to be distance- and frequency-dependent as the SMC and DMC exhibit different propagation mechanisms. Remarkably, it is reported that the interuser spatial correlation computed with DMC offers the best favorable propagation for a massive MIMO setup, whereas SMC contribute to the users correlation. Hence, correlation is found to be strongly dependent on the DMC ratio frequency characteristics. In addition, better interuser correlation and sum-rate capacity values are obtained as the frequency is increased. These results highlight the need to include DMC in 5G massive MIMO channel models and emulators to improve their accuracy at the system level., This work was supported in part by MINECO, Spain, under the National Projects TEC2016-78028-C3-2-P and TEC2017-86779-C2-2-R and in part by the ELSAT2020 OS4 SMARTIES program co-financed by the European Union with the European Regional Development Fund, the French state, and the Hauts de France Region Council.

Published
2019
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8. Hybrid virtual polarimetric massive MIMO measurements at 1.35 GHz

Author

Frederic Challita, Wout Joseph, Martine Lienard, Davy P. Gaillot, Pierre Laly, Emmeric Tanghe, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Universiteit Gent = Ghent University (UGENT), Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), and Universiteit Gent = Ghent University [Belgium] (UGENT)

Subjects
real-time radio channel sounder, line-of-sight scenario, Spatial correlation, Computer science, vertical uniform linear array, channel-based metrics, 02 engineering and technology, cross-polarisation, [SPI]Engineering Sciences [physics], Interference (communication), propagation, 0202 electrical engineering, electronic engineering, information engineering, sum-rate capacity, virtual array, multiple‐output radio channel, cross‐polarisation, Transmitter, polarimetric massive multiple-input multiple-output radio channel, antenna arrays, GHz, different polarisation schemes, frequency 1, line‐of‐sight scenario, Noise (radio), Communication channel, hybrid virtual polarimetric massive MIMO measurements, Technology and Engineering, MIMO, real‐time radio channel sounder, 8 × 12 massive MIMO transmitter, system-oriented, array, yet realistic array, MIMO systems, metrics, wireless channels, SYSTEMS, massive MIMO, Electronic engineering, system‐oriented metrics, Wireless, MIMO communication, 8 x 12, polarimetric massive multiple‐input, Electrical and Electronic Engineering, hybrid architecture, WIRELESS, different horizontal positions, frequency 1.35 GHz, Computer Science::Information Theory, massive MIMO transmitter, business.industry, receiver orientation, 020208 electrical & electronic engineering, uniform rectangular array, sum‐rate capacity, uniform rectangular, 020206 networking & telecommunications, Spectral efficiency, vertical uniform linear, massive MIMO systems, business, propagation channel‐based metrics, Rician channels, signal, receiver spatial correlation, indoor radio
Abstract

International audience; The polarimetric massive multiple‐input multiple‐output (MIMO) radio channel of an indoor line‐of‐sight scenario is investigated at 1.35 GHz using a real‐time radio channel sounder. The 8 × 12 massive MIMO transmitter is constructed using a hybrid architecture including a vertical uniform linear array translated at different horizontal positions forming a virtual, yet realistic, uniform rectangular array. The performance of the system is evaluated with six users distributed in the room for different polarisation schemes and receiver orientations using propagation channel‐based metrics (such as receiver spatial correlation and Rician factor) and system‐oriented metrics such as sum‐rate capacity and signal to interference and noise ratio. The results show a clear dependence of the performance to the polarisation schemes and receiver orientation and showing that when facing the array, cross‐polarisation can be very beneficial. Furthermore, it is concluded that the additional degree of freedom brought by the polarisation diversity can contribute to improve spectral efficiency (∼20% depending on the configuration), paving the way for further capacity enhancements in massive MIMO systems. It was also found that the receiver spatial correlation can be modelled using a Burr distribution.

Published
2019
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9. Stationarity analysis of V2I radio channel in a suburban environment

Author

Luc Martens, Marwan Yusuf, Frederic Challita, Davy P. Gaillot, Emmeric Tanghe, Pierre Laly, Wout Joseph, Martine Lienard, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Universiteit Gent = Ghent University (UGENT), Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), and Universiteit Gent = Ghent University [Belgium] (UGENT)

Subjects
Technology and Engineering, Computer Networks and Communications, Computer science, delay, Entropy, Decoding, MODELS, Aerospace Engineering, 02 engineering and technology, symbols.namesake, Channel capacity, [SPI]Engineering Sciences [physics], 0203 mechanical engineering, Vehicular, Entropy (information theory), Cloud computing, Fading, Statistical physics, correlation function, Electrical and Electronic Engineering, Random variables, Computer Science::Information Theory, VEHICLE, Broadcasting, Doppler, 020302 automobile design & engineering, fading, suburban, Indexes, Uncorrelated, scattering function, propagation model, stationarity, Automotive Engineering, Encoding, symbols, measurement, Doppler effect, Random variable, Decoding methods, Communication channel
Abstract

International audience; Due to rapid changes in the environment, vehicular communication channels no longer satisfy the assumption of wide-sense stationary uncorrelated scattering. The non-stationary fading process can be characterized by assuming local stationarity regions with finite extent in time and frequency. The local scattering function (LSF) and channel correlation function (CCF) provide a framework to characterize the mean power and correlation of the non-stationary channel scatterers, respectively. In this paper, we estimate the LSF and CCF from measurements collected in a vehicle-to-infrastructure radio channel sounding campaign in a suburban environment in Lille, France. Based on the CCF, the stationarity region is evaluated in time as 567 ms and used to capture the non-stationary fading parameters. We obtain the time-varying delay and Doppler power profiles from the LSF, and we analyze the corresponding root-mean-square delay and Doppler spreads. We show that the distribution of these parameters follows a lognormal model. Finally, application relevance in terms of channel capacity and diversity techniques is discussed. Results show that the assumption of ergodic capacity and the performance of various diversity techniques depend on the stationarity and coherence parameters of the channel. The evaluation and statistical modeling of such parameters can provide a way of tracking channel variation, hence, increasing the performance of adaptive schemes.

Published
2019
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10. Experimental Study of Depolarization and Antenna Correlation in Tunnels in the 1.3 GHz Band

Author

Martine Lienard, Pierre Laly, Frederic Challita, Wout Joseph, Pierre Degauque, Davy P. Gaillot, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Department of Information Technology, Universiteit Gent = Ghent University (UGENT)-iminds, Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and Universiteit Gent = Ghent University [Belgium] (UGENT)-iminds

Subjects
Spatial correlation, Technology and Engineering, spatial correlation minimisation, Frequency band, Acoustics, electromagnetic wave polarisation, real-time channel sounder, receiving antenna array elements, spatial correlation, [SPI]Engineering Sciences [physics], depolarization, transmit-receive diversity schemes, transmitting antennas, low-traffic road tunnel, propagation, 0502 economics and business, cross-polarization discrimination factor, tunnel, Road traffic, ComputingMilieux_MISCELLANEOUS, Computer Science::Information Theory, correlation methods, Physics, polarization, receiving antennas, 05 social sciences, Transmitter, 050209 industrial relations, road traffic, Polarization (waves), tunnels, dual-polarized patch antennas, microstrip antenna arrays, antenna correlation, Correlation method, frequency 1.3 GHz, Antenna correlation, UHF antennas, 050203 business & management, Uhf antennas
Abstract

Measurements have been carried out in a low-traffic road tunnel to investigate the influence of the polarization of the transmitting and receiving antennas on the channel characteristics. A real-time channel sounder working in a frequency band around 1.3 GHz has been used, the elements of the transmitting and receiving arrays being dual-polarized patch antennas. Special emphasis is made on cross-polarization discrimination factor and on the spatial correlation between array elements which has a great influence on the performances of transmit/receive diversity schemes. Various polarizations both at the transmitter and the receiver have been tested to minimize this spatial correlation while keeping the size of the array as small as possible.

Published
2019
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11. Impact of polarization diversity in massive MIMO for industry 4.0

Author

Marwan Yusuf, Pierre Laly, Wout Joseph, Emmeric Tanghe, Martine Lienard, Davy P. Gaillot, Frederic Challita, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Department of Information Technology, Universiteit Gent = Ghent University (UGENT)-iminds, Interuniversity Microelectronics Centre (IMEC), Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE), and Universiteit Gent = Ghent University [Belgium] (UGENT)-iminds

Subjects
Technology and Engineering, massive polarimetric radio channel, MRT, Computer science, MIMO, Polarimetry, 02 engineering and technology, maximum-ratio transmitter, 7. Clean energy, Precoding, precoder, [SPI]Engineering Sciences [physics], wireless channels, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, massive MIMO, Wireless, MIMO communication, sum-rate capacity, Gram matrix, WIRELESS, ComputingMilieux_MISCELLANEOUS, precoding, Gramian matrix, polarization diversity, propagation characteristics, business.industry, microwave antenna arrays, frequency 3.5 GHz, 020208 electrical & electronic engineering, Transmitter, uniform rectangular array, 020206 networking & telecommunications, Industry 4.0, Power (physics), average received gain, NETWORKS, Systems design, indoor industrial scenario, TECHNOLOGIES, system-oriented metrics, business
Abstract

The massive polarimetric radio channel is evaluated in an indoor industrial scenario at 3.5 GHz using a 10×10 uniform rectangular array (URA). The analysis is based on (1) propagation characteristics like the average received gain and the power to interference ratio from the Gram matrix and (2) system-oriented metrics such as sum-rate capacity with maximum-ratio transmitter (MRT). The results clearly show the impact of polarization diversity in an industrial scenario and how it can considerably improve different aspects of the system design. Results for sum-rate capacity are promising and show that the extra degree of freedom, provided by polarization diversity, can optimize the performance of a very simple precoder, the MRT.

Published
2019
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12. Channel correlation-based approach for feedback overhead reduction in massive MIMO

Author

Emmeric Tanghe, Marwan Yusuf, Pierre Laly, Wout Joseph, Pierre Degauque, Frederic Challita, Martine Lienard, Davy P. Gaillot, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Universiteit Gent = Ghent University (UGENT), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Universiteit Gent = Ghent University [Belgium] (UGENT), and Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE)

Subjects
Technology and Engineering, Industry 4, Computer science, MIMO, Duplex (telecommunications), Channel estimation, 02 engineering and technology, Data_CODINGANDINFORMATIONTHEORY, Antenna measurements, multiple-input-multiple-output (MIMO), Antenna array, Channel capacity, [SPI]Engineering Sciences [physics], massive, 0202 electrical engineering, electronic engineering, information engineering, Channel Estimation, Electrical and Electronic Engineering, WIRELESS, Computer Science::Information Theory, Tx correlation, Covariance matrix, Transmitter, 020206 networking & telecommunications, Industry 4.0, Transfer matrix, Correlation, Channel state information, Tx Correlation, Massive MIMO, Algorithm, Estimation
Abstract

International audience; For frequency-division duplex multiple-input-multiple-output (MIMO) systems, the channel state information at the transmitter is usually obtained by sending pilots or reference signals from all elements of the antenna array. The channel is then estimated by the receiver and communicated back to the transmitter. However, for massive MIMO, this periodical estimation of the full transfer matrix can lead to prohibitive overhead. To reduce the amount of data, we propose to estimate the updated channel matrix from the knowledge of the full correlation matrix at the transmitter made during some initialization time and the instantaneous measured channel matrix of smaller size, characterizing the link between the user and a limited number of reference array elements. The proposed algorithm is validated with measured massive MIMO channel transfer functions at 3.5 GHz between a 9 × 9 uniform rectangular array and different user positions. Since measurements were made in static conditions, the criteria chosen for evaluating the performance of the algorithm are based on a comparison of the predicted channel capacity calculated from either the measured or estimated channel matrix.

Published
2019
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13. Line-of-sight massive MIMO channel characteristics in an indoor scenario at 94 GHz

Author

Davy P. Gaillot, Martine Lienard, Maria-Teresa Martinez-Ingles, Frederic Challita, Jose-Maria Molina-Garcia-Pardo, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), and Télécommunication, Interférences et Compatibilité Electromagnétique (IEMN-TELICE)

Subjects
Line-of-sight, General Computer Science, Computer science, Millimeter wave, 05 social sciences, MIMO, General Engineering, 050801 communication & media studies, 020206 networking & telecommunications, indoor propagation, 02 engineering and technology, Antenna array, [SPI]Engineering Sciences [physics], 0508 media and communications, Interference (communication), massive MIMO, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, General Materials Science, Fading, lcsh:Electrical engineering. Electronics. Nuclear engineering, lcsh:TK1-9971, Decorrelation, Communication channel, Computer Science::Information Theory
Abstract

The fading and correlation characteristics of virtual, yet realistic, line-of-sight (LOS) $4\times 2500$ millimetric (mmW) massive MIMO channels are investigated at 94 GHz in an indoor office environment for three different Tx–Rx distance scenarios. The capability of the mmW massive MIMO channel to spatially decorrelate the users is evaluated with the computation of the channel correlation and other channel metrics, such as power-to-interference ratio and condition number. In particular, the correlation between channel vectors for a given user and its influence on receiving correlation is discussed. The results clearly demonstrate the capability of mmW massive MIMO systems to reach orthogonal Tx–Rx streams even for a small $7\times 7$ antenna array subset with correlation between users

Published
2018
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14. Angular characteristics of multipath propagation in an indoor industrial environment

Author

Aliou Bamba, Emmeric Tanghe, Aladji Kamagaté, Pierre Laly, Frédéric Challita, Adama Konaté, Wout Joseph, Martine Liénard, and Davy P. Gaillot

Subjects
gamma distribution, indoor radio, maximum likelihood estimation, MIMO communication, multipath channels, pattern clustering, Telecommunication, TK5101-6720, Electricity and magnetism, QC501-766
Abstract

Abstract The characteristics of multipath components (MPCs) are addressed in an industrial environment at 1.3 GHz by means of measurements with a multidimensional channel sounder. The maximum likelihood estimator, RiMAX, is used to determine the MPCs parameters and takes into account the diffuse scattering. Both line‐of‐sight (LOS) and obstructed LOS (OLOS) scenarios have been considered, along with the four polarization states. We found that the environment is very rich in multipath, that is on average, about 120 (resp. 70) MPCs in LOS (resp. OLOS) scenario due to the presence of several metallic reflectors. The azimuthal angle implies clustering of the MPCs, and therefore, the estimated MPCs are grouped in clusters using the K‐powers‐means algorithm based on the multipath component distance. In general, one to four clusters are determined with three clusters occurring with the highest probability, regardless of the scenario. Next, the intra‐cluster parameters have been determined, and we show that the root‐mean‐square (rms) delay spread and rms angular spread follow a gamma distribution, regardless of the polarization. The MPC characteristics agree with the results in the literature and can be valuable when deploying a wireless sensor network in industrial environments.

Published
2021
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