Patents

Chapters

Journals

1. A. Xhafa, F. Fabra, D. Egea-Roca, J. A. Lopez-Salcedo, G. Seco-Granados, "Experimental Investigation of AoA Estimation and Antenna Calibration with 5G NR signals using USRP Devices", IEEE Transactions on Instrumentation and Measurement, vol. 74, pp. 1-15, May 2025, [link].
2. Q. Liu, Chengfa Gao, A. Xhafa, Wang Gao, J. A. Lopez-Salcedo, G. Seco-Granados, "Performance Analysis of GNSS+5G Hybrid Positioning Algorithms for Smartphones in Urban Environments", IEEE Transactions on Instrumentation and Measurement, vol. 73, pp. 1-9, Dec. 2023, [link].
3. A. Xhafa, J. A. del Peral-Rosado, J. A. Lopez-Salcedo, G. Seco-Granados, "Evaluation of 5G positioning performance based on UTDoA, AoA and base-station selective exclusion", Sensors, vol. 22, num. 1, 14 pages, Jan. 2022, [link].

Conferences

1. J. A. del Peral-Rosado, S. Schlötzer, E. Ince, S. Al Faris, G. Ligorio, F. Soualle, A. Malik, C. Thienot, E. Eberlein, G. Yammine, K. Loidl, B. Ghimire, D. Egea-Roca, A. Xhafa, J. A. Lopez-Salcedo, G. Seco-Granados, I. Lapin, F. Grec, F. Abel, "Technology Enablers Towards Unified PNT with GNSS, 5G and 6G Solutions", Proc. ESA Workshop on Satellite Navigation User Equipment Technologies (NAVITEC), May 2026.
2. A. Xhafa, D. Egea-Roca, J. A. Lopez-Salcedo, S. Schlötzer, J. A. del Peral-Rosado, F. Abel, G. Seco-Granados, "Hybrid Random-Directional RIS Phase Profile Design for Multi-Layer TN/NTN Positioning", Proc. ESA Workshop on Satellite Navigation User Equipment Technologies (NAVITEC), May 2026.
3. D. Egea-Roca, A. Xhafa, J. A. Lopez-Salcedo, G. Seco-Granados, "First Results on RIS-Enabled Multi-Layer Localization: A Joint Terrestrial and Non-Terrestrial Method", IEEE ICASSP, May 2026.
4. A. Xhafa, D. Egea-Roca, J. A. Lopez-Salcedo, G. Seco-Granados, "A Comparative Analysis of Key Performance Indicators for RIS-Enhanced Non-Terrestrial and Terrestrial Localization", Proc. European Signal Processing Conference (EUSIPCO), Sep. 2025, [link].
5. D. Egea-Roca, A. Xhafa, J. A. Lopez-Salcedo, G. Seco-Granados, "Performance Assessment of Multi-RIS-Aided Localization in Terrestrial and Non-Terrestrial Networks", Proc. European Navigation Conference (ENC), May 2025.
6. A. Xhafa, F. Fabra, J. A. Lopez-Salcedo, G. Seco-Granados, I. Lapin, "Pathway to Coherent Phase Acquisition in Multi-channel USRP SDRs for Direction of Arrival Estimation", Proc. International Conference on Software Defined Systems (SDS), Oct. 2023, [link].
7. A. Xhafa, F. Fabra, J. A. Lopez-Salcedo, G. Seco-Granados, "Preliminary Results of 5G Direction of Arrival Estimation using In-Situ Calibration with USRP", Proc. ICL-GNSS, June 2023, [link].
8. A. Xhafa, J. A. del Peral-Rosado, G. Seco-Granados, J. A. Lopez-Salcedo, "Performance of NLOS Base Station Exclusion in cmWave 5G Positioning", Proc. IEEE Vehicular Technology Conference (VTC) Spring, Apr. 2021, [link].