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F. Javier Lopez-Martinez, personal website

PRECLARIS: Practical and Efficient Communications Through Large and Reconfigurable Intelligent Surfaces (PID2020-118139RB-I00)

This project was funded by the Spanish Ministry of Science and Innovation (Sep 2021-Feb 2025).

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Objectives

The general objective is to determine how practical and efficient communications can be achieved by means of large and reconfigurable intelligent surfaces. Specifically, we aim to contribute to solving the underlying problems associated the following aspects:

  1. Channel Modeling: the lack of proper realistic channel models for RIS and LIS for communications.

  2. Signal Processing: the difficulty of implementing robust estimation and adaptive filtering techniques for RIS/LIS that operate in real-time, non-stationary and finite-sample regimes.

  3. Use Cases: the definition of convincing use cases that fully exploit the potential of RIS/LIS under realistic conditions.

Research group

PIs:

Researchers and collaborators:

Project outputs

Journal publications

  1. J.D. Vega-Sanchez, L. Urquiza-Aguiar, M.C. Paredes-Paredes, F.J. Lopez-Martinez, “Expectation-Maximization Learning for Wireless Channel Modeling of Reconfigurable Intelligent Surfaces”, IEEE Wireless Communications Letters, vol. 10, no. 9, pp. 2051-2055, Sept. 2021.

  2. J.P. González-Coma, F.J. Lopez-Martinez and L. Castedo, “Low-Complexity Distance-Based Scheduling for Multi-User XL-MIMO Systems,” in IEEE Wireless Communications Letters, vol. 10, no. 11, pp. 2407-2411, Nov. 2021, doi: 10.1109/LWC.2021.3101940.

  3. M. Olyaee, J. M. Romero-Jerez, F.J. Lopez-Martinez and A. J. Goldsmith, “Alternative Formulations for the Fluctuating Two-Ray Fading Model,” in IEEE Transactions on Wireless Communications, vol. 21, no. 11, pp. 9404-9416, Nov. 2022, doi: 10.1109/TWC.2022.3176221.

  4. J. David Vega-Sánchez, G. Kaddoum and F.J. Lopez-Martinez, “Physical Layer Security of RIS-Assisted Communications Under Electromagnetic Interference,” in IEEE Communications Letters, vol. 26, no. 12, pp. 2870-2874, Dec. 2022, doi: 10.1109/LCOMM.2022.3209136.

  5. G. J. Anaya-López, J. P. González-Coma and F.J. Lopez-Martinez, “Leakage Subspace Precoding and Scheduling for Physical Layer Security in Multi-User XL-MIMO Systems,” in IEEE Communications Letters, vol. 27, no. 2, pp. 467-471, Feb. 2023, doi: 10.1109/LCOMM.2022.3225881.

  6. F. J. Martín-Vega, G. Gómez, D. Morales-Jiménez, F.J. Lopez-Martinez and M. C. Aguayo-Torres, “Joint Distribution of Distance and Angles in Finite Wireless Networks,” early access in IEEE Transactions on Vehicular Technology, 2023 doi: 10.1109/TVT.2023.3278130.

  7. J. Camacho, R. Vitale, D. Morales-Jimenez, C. Gómez-Llorente, “Variable-selection ANOVA simultaneous component analysis (VASCA)”, Bioinformatics, vol. 39, no. 1, pp. 1–9, Jan. 2023.

  8. J. W. Browning, S. L. Cotton, P. C. Sofotasios, D. Morales-Jimenez and M. D. Yacoub, “A Unification of LoS, Non-LoS, and Quasi-LoS Signal Propagation in Wireless Channels,” in IEEE Transactions on Antennas and Propagation, vol. 71, no. 3, pp. 2682-2696, March 2023, doi: 10.1109/TAP.2022.3231686.

  9. K.-K. Wong, D. Morales-Jimenez, K. -F. Tong and C. -B. Chae, “Slow Fluid Antenna Multiple Access,” in IEEE Transactions on Communications, vol. 71, no. 5, pp. 2831-2846, May 2023, doi: 10.1109/TCOMM.2023.3255904.

  10. J. W. Browning, N. Simmons, S. L. Cotton, P. C. Sofotasios, D. Morales-Jimenez, M. Matthaiou, “A simulation framework for cooperative reconfigurable intelligent surface based systems”, IEEE Transactions on Communications, vol. 72, no. 1, pp. 480-495, Jan. 2024, doi: 10.1109/TCOMM.2023.3282952.

  11. J. D. Vega-Sánchez, F.J. Lopez-Martinez, J. F. Paris and J. M. Romero-Jerez, “The Multi-Cluster Fluctuating Two-Ray Fading Model,” in IEEE Transactions on Wireless Communications, vol. 23, no. 5, pp. 4199-4213, May 2024, doi: 10.1109/TWC.2023.3315732.

  12. M. Olyaee, J. P. Peña-Martín, F.J. Lopez-Martinez and J. M. Romero-Jerez, “The Multi-cluster Two-Wave Fading Model,” in IEEE Transactions on Communications, 2024, early Access doi: 10.1109/TCOMM.2024.3469543.

  13. A. Palomares-Caballero, C. Molero, F. Rostami Ghadi, F.J. Lopez-Martinez, P. Padilla, D. Morales-Jimenez, J.F. Valenzuela-Valdes, “Enabling Intelligent Omni-Surfaces in the Polarization Domain: Principles, Implementation and Applications”, in IEEE Communications Magazine, vol. 61, no. 11, pp. 144-150, November 2023, doi: 10.1109/MCOM.001.2300163.

  14. F. Rostami Ghadi and F.J. Lopez-Martinez, “RIS-Aided Communications Over Dirty MAC: Capacity Region and Outage Probability,” in IEEE Communications Letters, vol. 27, no. 8, pp. 2009-2013, Aug. 2023, doi: 10.1109/LCOMM.2023.3284502.

  15. J.P. Gonzalez-Coma, F.J. Lopez-Martinez, Luis Castedo, “Joint User Scheduling and Precoding for XL-MIMO Systems with Imperfect CSI”, in IEEE Wireless Communications Letters, vol. 12, no. 10, pp. 1657-1661, Oct. 2023, doi: 10.1109/LWC.2023.3281650.

  16. J. Lopez-Fernandez, G.J. Anaya-Lopez, and F.J. Lopez-Martinez, “The Second Order Scattering Fading Model with Fluctuating Line-of-Sight”, IEEE Transactions on Vehicular Technology, vol. 73, no. 9, pp. 13898-13902, Sept. 2024, doi: 10.1109/TVT.2024.3384582.

  17. F. Rostami Ghadi, K.K. Wong, F.J. Lopez-Martinez, K.F. Tong, “Copula-based Performance Analysis for Fluid Antenna Systems under Arbitrary Fading Channels”, in IEEE Communications Letters, vol. 27, no. 11, pp. 3068-3072, Nov. 2023, doi: 10.1109/LCOMM.2023.3316359.

  18. F. Rostami Ghadi, F.J. Lopez-Martinez, K.K. Wong, “Analytical Characterization of Coverage Regions for STAR-RIS-aided NOMA/OMA Communication Systems”, IEEE Communications Letters, vol. 27, no. 11, pp. 3063-3067, Nov. 2023.

  19. I. Sanchez, F.J. Lopez-Martinez, “The Lomax Distribution for Wireless Channel Modeling: Theory and Applications”, in IEEE Open Journal of Vehicular Technology, vol. 5, pp. 162-171, 2024. DOI: 10.1109/OJVT.2023.3342074.

  20. F. Rostami Ghadi, K.K. Wong, F.J. Lopez-Martinez, C.B. Chae, K.F. Tong, Y. Zhang, “Fluid Antenna-Assisted Dirty Multiple Access Channels over Composite Fading”, in IEEE Communications Letters, vol. 28, no. 2, pp. 382-386, Feb. 2024, DOI: 10.1109/LCOMM.2023.3344296

  21. F. Rostami Ghadi, K.K. Wong, F.J. Lopez-Martinez, C.B. Chae, K.F. Tong, Y. Zhang, “A Gaussian Copula Approach to the Performance Analysis of Fluid Antenna Systems”, IEEE Transactions on Wireless Communications, vol. 23, no. 11, pp. 17573-17585, Nov. 2024. DOI: 10.1109/TWC.2024.3454558.

  22. F. Rostami Ghadi, K.K. Wong, F.J. Lopez-Martinez, W.K. New, H. Xu, C.B. Chae, “Physical Layer Security over Fluid Antenna Systems: Secrecy Performance Analysis”, IEEE Transactions on Wireless Communications, vol. 23, no. 12, pp. 18201-18213, Dec. 2024. DOI: 10.1109/TWC.2024.3463488.

  23. S. Fernandez, J.A. Bailon-Martinez, J.E. Galeote-Cazorla, F.J. Lopez-Martinez, “Analytical Characterization of the Operational Diversity Order in Fading Channels”, IEEE Communications Letters, vol. 29, no. 2, pp. 274-278, Feb. 2025. DOI: 10.1109/LCOMM.2024.3512665.

  24. J. P. Gonzalez-Coma, D. Morales-Jimenez, “Blind SINR estimation for massive MIMO systems”, IEEE Wireless Communications Letters, vol. 13, no. 9, pp. 2492–2496, Sep. 2024. DOI: 10.1109/LWC.2024.3421592.

  25. P. Ramirez-Espinosa, D. Morales-Jimenez, K. K. Wong, “A new spatial block-correlation model for fluid antenna systems”, IEEE Transactions on Wireless Communications, vol. 23, no. 11, pp. 15829–15843, Nov. 2024. DOI: 10.1109/TWC.2024.3434509.

  26. X. Lai, J. Yao, K. Zhi, T. Wu, D. Morales-Jimenez, K. K. Wong, “FAS-RIS: A block-correlation model analysis”, IEEE Transactions on Vehicular Technology, vol. 74, no. 2, pp. 3412–3417, Feb. 2025. DOI: 10.1109/TVT.2024.3480234.

  27. W. K. New, K. K. Wong, H. Xu, C. Wang, F. R. Ghadi, J. Zhang, J. Rao, R. Murch, P. Ramirez-Espinosa, D. Morales-Jimenez, C. B. Chae, K. F. Tong, “A tutorial on fluid antenna system for 6G networks: Encompassing communication theory, optimization methods and hardware designs”, IEEE Communications Surveys and Tutorials, to appear, 2024.

Conferences

  1. M. Olyaee, J. M. Romero-Jerez, F. J. López-Martínez and A. J. Goldsmith, “Composite IG-FTR Channel Performance in Wireless Communication Systems,” 2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Kyoto, Japan, 2022, pp. 1314-1319, doi: 10.1109/PIMRC54779.2022.9977689.

  2. F. J. Martín-Vega, G. Gómez, D. Morales-Jiménez, F. J. López-Martínez and M. C. Aguayo-Torres, “Joint Distribution of Distance and Angle in Rectangular Finite Wireless Networks,” 2022 International Symposium on Wireless Communication Systems (ISWCS), Hangzhou, China, 2022, pp. 1-6, doi: 10.1109/ISWCS56560.2022.9940398.

  3. J. W. Browning, S. L. Cotton, P. C. Sofotasios, D. Morales-Jimenez and M. D. Yacoub, “LoS, Non-LoS and Quasi-LoS Signal Propagation: A Three State Channel Model,” 2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring), Helsinki, Finland, 2022, pp. 1-5, doi: 10.1109/VTC2022-Spring54318.2022.9860640.

  4. P. Ramírez-Espinosa, R. J. Williams, J. Yuan and E. De Carvalho, “Performance Evaluation of Dynamic Metasurface Antennas: Impact of Insertion Losses and Coupling,” GLOBECOM 2022 - 2022 IEEE Global Communications Conference, Rio de Janeiro, Brazil, 2022, pp. 2493-2498, doi: 10.1109/GLOBECOM48099.2022.10001283.

  5. M. Olyaee, J. P. Peña-Martín, F.J. Lopez-Martinez and J.M. Romero-Jerez, “Statistical Characterization of the Multicluster Two-Wave Fading Model,” 2022 5th International Conference on Advanced Communication Technologies and Networking (CommNet), Marrakech, Morocco, 2022, pp. 1-7, doi: 10.1109/CommNet56067.2022.9993838.

  6. G.J. Anaya-López, J. P. González-Coma and F. J. López-Martínez, “Spatial Degrees of Freedom for Physical Layer Security in XL-MIMO,” 2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring), Helsinki, Finland, 2022, pp. 1-5, doi: 10.1109/VTC2022-Spring54318.2022.9860861.

  7. J.D. Vega-Sanchez, L. Urquiza-Aguiar, M.C. Paredes-Paredes, F.J. Lopez-Martinez, “Secure Systems via Reconfigurable Intelligent Surfaces over Correlated Rayleigh Channels”, IEEE ECTM 2021.

  8. J.C. Ruiz-Sicilia, J. Gimenez, G.J. Anaya-Lopez, F.J. Lopez-Martinez, “Configuring an Intelligent Reflecting Surface for Wireless Communications: the hUMAns at RISk approach”, XXXVI URSI National Symposium 2021.

  9. J. W. Browning, N. Simmons, P. C. Sofotasios, S. L. Cotton, D. Morales-Jimenez, M. Matthaiou, M. A. B. Abbasi, “A simulation framework for RIS communications”, IEEE Vehicular Technology Conference (VTC2023-Spring), Florence (Italy), Jun. 2023.

  10. I. Sanchez, F.J. Lopez-Martinez, “The Lomax Distribution for Wireless Channel Modeling: a Preliminary Study”, IEEE ETCM, 2023. Best paper award in the Communications track.

  11. F. Rostami Ghadi, K.K. Wong, M. Kaveh, F.J. Lopez-Martinez, W.K. New, H. Xu,“Secrecy Performance Analysis of RIS-Aided Fluid Antenna Systems”, IEEE WCNC 2025.

  12. M. Olyaee, H. Hashemi and J. M. Romero-Jerez, “Performance analysis under the Independent Fluctuating Two-Ray (IFTR) Fading in RIS-Assisted Millimeter Wave Communications,” 2024 32nd International Conference on Electrical Engineering (ICEE), Tehran, Iran, Islamic Republic of, 2024, pp. 1-5, doi: 10.1109/ICEE63041.2024.10667837.

  13. M.C. Fernandez-Montefiore, G.J. Gonzalez, F.J. Lopez-Martinez, F. Gregorio, “Multi-Objective Optimization for URLLC over 5G Networks in the Finite Blocklength Regime”, XX RPIC 2023.

  14. M.C. Fernandez-Montefiore, G.J. Gonzalez, F.J. Lopez-Martinez, F. Gregorio, “Balanced-QoS power allocation schemes for NOMA in the finite blocklength regime”, LIII JAIIO 2024.