Gonzalo Seco | Universitat Autònoma de Barcelona (original) (raw)
Papers by Gonzalo Seco
IEEE Transactions on Wireless Communications, 2021
Reconfigurable intelligent surfaces (RISs) are one of the most promising technological enablers o... more Reconfigurable intelligent surfaces (RISs) are one of the most promising technological enablers of the next (6th) generation of wireless systems. In this paper, we introduce a novel use-case of the RIS technology in radio localization, which is enabling the user to estimate its own position via transmitting orthogonal frequency-division multiplexing (OFDM) pilots and processing the signal reflected from the RIS. We demonstrate that user localization in this scenario is possible by deriving CramérRao lower bounds on the positioning error and devising a lowcomplexity position estimation algorithm. We consider random and directional RIS phase profiles and apply a specific temporal coding to them, such that the reflected signal from the RIS can be separated from the uncontrolled multipath. Finally, we assess the performance of our position estimator for an example system, and show that the proposed algorithm can attain the derived bound at high signal-to-noise ratio values.
Publication in the conference proceedings of EUSIPCO, Marrakech, Morocco, 2013
5G-NR New Radio (5G-NR) is destined to revolutionize the wireless communications as well<br>... more 5G-NR New Radio (5G-NR) is destined to revolutionize the wireless communications as well<br> as user wireless positioning. 5G-NR will be able to offer not only higher throughput and<br> higher available frequency bands of operation, but also improved services, including enhanced<br> Location Based Services. 5G systems will continue to use the Positioning Reference Signals<br> (PRS) employed now in 4G systems, in order to enable positioning with non-synchronized<br> Base Stations (BS) with an increased performance compared to 4G positioning. PRS are used<br> to measure the delays of the downlink transmissions by correlating the received signal from<br> the base station with a local replica in the receiver. In this paper, different PRS allocations<br> within the 5G frame are analysed and compared in order to find if the PRS distribution affects<br> the positioning performance, and, if this happens, which the best distribution is.
IEEE Transactions on Vehicular Technology, 2021
IEEE Transactions on Wireless Communications, 2021
Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), 2017
IEEE Transactions on Wireless Communications, 2018
IEEE Transactions on Signal Processing, 2018
IEEE Transactions on Broadcasting, 2016
2015 International Conference on Location and GNSS (ICL-GNSS), 2015
2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), 2014
2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013
2013 International Conference on Localization and GNSS (ICL-GNSS), 2013
Navigation and communications capabilities become necessary in current wireless transmission syst... more Navigation and communications capabilities become necessary in current wireless transmission systems. The new mobile terminals demand higher requirements to satisfy high-data rate services, as well as new location-based applications. On one side, GNSS systems greatly succeed to provide precise positioning for new applications and services. On the other, multicarrier signals are widely used for high-capacity transmission, such as in xDSL, WiFi or WiMAX. Thus, the current commercial market proposes the combination of GNSS and communication systems to enhance performance. Nevertheless, the use of mobile terminals in harsh environments, such as urban or indoor areas, deteriorates the performance of GNSS receivers. Therefore, the application of multicarrier signals also for ranging purposes is proposed to achieve the required NAV-COM system. Although multicarrier signals have been widely adopted in communications, little attention has been paid to their potential application to navigatio...
Location-aware communication systems are expected to play a pivotal part in the next generation o... more Location-aware communication systems are expected to play a pivotal part in the next generation of mobile communication networks. Therefore, there is a need to understand the localization limits in these networks, particularly, using millimeter-wave technology (mmWave). Towards that, we address the uplink and downlink localization limits in terms of 3D position and orientation error bounds for mmWave multipath channels. We also carry out a detailed analysis of the dependence of the bounds of different systems parameters. Our key findings indicate that the uplink and downlink behave differently in two distinct ways. First of all, the error bounds have different scaling factors with respect to the number of antennas in the uplink and downlink. Secondly, uplink localization is sensitive to the orientation angle of the user equipment (UE), whereas downlink is not. Moreover, in the considered outdoor scenarios, the non-line-of-sight paths generally improve localization when a line-of-sight path exists. Finally, our numerical results show that mmWave systems are capable of localizing a UE with sub-meter position error, and sub-degree orientation error.
2018 IEEE Globecom Workshops (GC Wkshps), 2018
IEEE Transactions on Wireless Communications, 2021
Reconfigurable intelligent surfaces (RISs) are one of the most promising technological enablers o... more Reconfigurable intelligent surfaces (RISs) are one of the most promising technological enablers of the next (6th) generation of wireless systems. In this paper, we introduce a novel use-case of the RIS technology in radio localization, which is enabling the user to estimate its own position via transmitting orthogonal frequency-division multiplexing (OFDM) pilots and processing the signal reflected from the RIS. We demonstrate that user localization in this scenario is possible by deriving CramérRao lower bounds on the positioning error and devising a lowcomplexity position estimation algorithm. We consider random and directional RIS phase profiles and apply a specific temporal coding to them, such that the reflected signal from the RIS can be separated from the uncontrolled multipath. Finally, we assess the performance of our position estimator for an example system, and show that the proposed algorithm can attain the derived bound at high signal-to-noise ratio values.
Publication in the conference proceedings of EUSIPCO, Marrakech, Morocco, 2013
5G-NR New Radio (5G-NR) is destined to revolutionize the wireless communications as well<br>... more 5G-NR New Radio (5G-NR) is destined to revolutionize the wireless communications as well<br> as user wireless positioning. 5G-NR will be able to offer not only higher throughput and<br> higher available frequency bands of operation, but also improved services, including enhanced<br> Location Based Services. 5G systems will continue to use the Positioning Reference Signals<br> (PRS) employed now in 4G systems, in order to enable positioning with non-synchronized<br> Base Stations (BS) with an increased performance compared to 4G positioning. PRS are used<br> to measure the delays of the downlink transmissions by correlating the received signal from<br> the base station with a local replica in the receiver. In this paper, different PRS allocations<br> within the 5G frame are analysed and compared in order to find if the PRS distribution affects<br> the positioning performance, and, if this happens, which the best distribution is.
IEEE Transactions on Vehicular Technology, 2021
IEEE Transactions on Wireless Communications, 2021
Proceedings of the 30th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2017), 2017
IEEE Transactions on Wireless Communications, 2018
IEEE Transactions on Signal Processing, 2018
IEEE Transactions on Broadcasting, 2016
2015 International Conference on Location and GNSS (ICL-GNSS), 2015
2014 7th ESA Workshop on Satellite Navigation Technologies and European Workshop on GNSS Signals and Signal Processing (NAVITEC), 2014
2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013
2013 International Conference on Localization and GNSS (ICL-GNSS), 2013
Navigation and communications capabilities become necessary in current wireless transmission syst... more Navigation and communications capabilities become necessary in current wireless transmission systems. The new mobile terminals demand higher requirements to satisfy high-data rate services, as well as new location-based applications. On one side, GNSS systems greatly succeed to provide precise positioning for new applications and services. On the other, multicarrier signals are widely used for high-capacity transmission, such as in xDSL, WiFi or WiMAX. Thus, the current commercial market proposes the combination of GNSS and communication systems to enhance performance. Nevertheless, the use of mobile terminals in harsh environments, such as urban or indoor areas, deteriorates the performance of GNSS receivers. Therefore, the application of multicarrier signals also for ranging purposes is proposed to achieve the required NAV-COM system. Although multicarrier signals have been widely adopted in communications, little attention has been paid to their potential application to navigatio...
Location-aware communication systems are expected to play a pivotal part in the next generation o... more Location-aware communication systems are expected to play a pivotal part in the next generation of mobile communication networks. Therefore, there is a need to understand the localization limits in these networks, particularly, using millimeter-wave technology (mmWave). Towards that, we address the uplink and downlink localization limits in terms of 3D position and orientation error bounds for mmWave multipath channels. We also carry out a detailed analysis of the dependence of the bounds of different systems parameters. Our key findings indicate that the uplink and downlink behave differently in two distinct ways. First of all, the error bounds have different scaling factors with respect to the number of antennas in the uplink and downlink. Secondly, uplink localization is sensitive to the orientation angle of the user equipment (UE), whereas downlink is not. Moreover, in the considered outdoor scenarios, the non-line-of-sight paths generally improve localization when a line-of-sight path exists. Finally, our numerical results show that mmWave systems are capable of localizing a UE with sub-meter position error, and sub-degree orientation error.
2018 IEEE Globecom Workshops (GC Wkshps), 2018