248 citations · 796 across the 22 of their papers we have counts for
23 papers
Time-modulated phased array controlled with nonideal bipolar squared periodic sequences
R. Maneiro-Catoira, J. Brégains, José A. García-Naya +1
Bipolar (+/-1) sequences with no zero state suit particularly well for safeguarding the switched feeding network efficiency when applied to time-modulated arrays (TMAs). During the…
Unleashing the Potential of LTE for Next Generation Railway Communications
P. Fraga-Lamas, J. Rodríguez-Piñeiro, J. A. García-Naya +1
In an increasingly demanding marketplace that will put great strain on railway services, research on broadband wireless communication must continue to strive for improvement. Based…
A Review on Internet of Things for Defense and Public Safety
Paula Fraga-Lamas, Tiago M. Fernández-Caramés, Manuel Suárez-Albela +2
The Internet of Things (IoT) is undeniably transforming the way that organizations communicate and organize everyday businesses and industrial procedures. Its adoption has proven w…
Reverse Engineering and Security Evaluation of Commercial Tags for RFID-Based IoT Applications
Tiago M. Fernández-Caramés, Paula Fraga-Lamas, Manuel Suárez-Albela +1
The Internet of Things (IoT) is a distributed system of physical objects that requires the seamless integration of hardware (e.g., sensors, actuators, electronics) and network comm…
Lattice-Based Analog Mappings for Low-Latency Wireless Sensor Networks
Pedro Suárez-Casal, Óscar Fresnedo, Darian Pérez-Adán +1
We consider the transmission of spatially correlated analog information in a wireless sensor network (WSN) through fading single-input and multiple-output (SIMO) multiple access ch…
A Rank-Constrained Coordinate Ascent Approach to Hybrid Precoding for the Downlink of Wideband Massive (MIMO) Systems
José P. González-Coma, Óscar Fresnedo, Luis Castedo
An innovative approach to hybrid analog-digital precoding for the downlink of wideband massive MIMO systems is developed. The proposed solution, termed Rank-Constrained Coordinate…
Deep Contextual Bandit and Reinforcement Learning for IRS-Assisted MU-MIMO Systems
Dariel Pereira-Ruisánchez, Óscar Fresnedo, Darian Pérez-Adán +1
The combination of multiple-input multiple-output (MIMO) systems and intelligent reflecting surfaces (IRSs) is foreseen as a critical enabler of beyond 5G (B5G) and 6G. In this wor…
Transmission of Spatio-Temporal Correlated Sources Over Fading Multiple Access Channels With DQLC Mappings
O. Fresnedo, P. Suárez-Casal, L. Castedo
The design of zero-delay Joint Source-Channel Coding (JSCC) schemes for the transmission of correlated information over fading Multiple Access Channels (MACs) is an interesting pro…
Design of Linear Precoders for Correlated Sources in MIMO Multiple Access Channels
P. Suárez-Casal, J. P. González-Coma, O. Fresnedo +1
This work focuses on distributed linear precoding when users transmit correlated information over a fading Multiple-Input and Multiple-Output Multiple Access Channel. Precoders are…
Channel Estimation and Hybrid Precoding for Frequency Selective Multiuser mmWave MIMO Systems
J. P. González-Coma, J. Rodríguez-Fernández, N. González-Prelcic +2
Configuring the hybrid precoders and combiners in a millimeter wave (mmWave) multiuser (MU) multiple-input multiple-output (MIMO) system is challenging in frequency selective chann…
Alternating Minimization for Wideband Multiuser IRS-aided MIMO Systems under Imperfect CSI
Darian Pérez-Adán, Michael Joham, Óscar Fresnedo +3
This work focuses on wideband intelligent reflecting surface (IRS)-aided multiuser MIMO systems. One of the major challenges of this scenario is the joint design of the frequency-d…
Time-modulated multibeam phased arrays with periodic Nyquist pulses
R. Maneiro-Catoira, J. Brégains, José A. García-Naya +1
We present a single sideband time-modulated multibeam phased array governed by periodic Nyquist pulsed signals. A Nyquist pulse is a physically realizable approach to the ideal sin…
Time-modulated arrays with Haar wavelets
R. Maneiro-Catoira, J. Brégains, José A. García-Naya +1
Time-modulated arrays (TMAs) can effectively perform beamsteering over the first positive harmonic pattern by applying progressively delayed versions of stair-step approximations o…
Analog beamforming using time-modulated arrays with digitally preprocessed rectangular sequences
R. Maneiro-Catoira, J. Brégains, José A. García-Naya +1
Conventional time-modulated arrays are based on the application of variable-width periodical rectangular pulses (easily implemented with radio frequency switches) to the individual…
Time-modulated array beamforming with periodic stair-step pulses
R. Maneiro-Catoira, J. Brégains, José A. García-Naya +1
Time-modulated arrays (TMAs) are able to improve the side-lobe level of the radiation pattern at the fundamental mode but cannot steer the beam at such a mode towards a given direc…
Bit error probability and capacity bound of OFDM systems in deterministic doubly-selective channels
Tomás Domínguez-Bolaño, José Rodríguez-Piñeiro, José A. García-Naya +1
Doubly-selective channels, such as those that occur when the transmitter and the receiver move relative to each other at high speeds, are a key scenario for fifth generation (5G) c…
Joint User Scheduling and Precoding for XL-MIMO Systems with Imperfect CSI
Jose P. Gonzalez-Coma, F. Javier Lopez-Martinez, Luis Castedo
We propose an algorithm for joint precoding and user selection in multiple-input multiple-output systems with extremely-large aperture arrays, assuming realistic channel conditions…
Low-Complexity Distance-Based Scheduling for Multi-User XL-MIMO Systems
José P. González-Coma, F. Javier López-Martínez, Luis Castedo
We introduce DBS, a new technique for user selection in downlink multi-user communications with extra-large (XL) antenna arrays. DBS categorizes users according to their equivalent…
FDD Channel Estimation via Covariance Identification in Wideband Massive MIMO Systems
José González-Coma, Pedro Suárez-Casal, Paula M. Castro +2
A method for channel estimation in wideband massive Multiple-Input Multiple-Output (MIMO) systems using covariance identification is developed. The method is useful for Frequency-D…
Hybrid LISA for Wideband Multiuser Millimeter Wave Communication Systems under Beam Squint
José P. González-Coma, Wolfgang Utschick, Luis Castedo
This work jointly addresses user scheduling and precoder/combiner design in the downlink of a wideband millimeter wave (mmWave) communications system. We consider Orthogonal Freque…
QoS Constrained Power Minimization in the Multiple Stream MIMO Broadcast Channel
José P. González-Coma, Michael Joham, Paula M. Castro +1
This work addresses the design of optimal linear transmit filters for the Multiple Input-Multiple Output (MIMO) Broadcast Channel (BC) when several spatial streams are allocated to…
QoS Constrained Power Minimization in the MISO Broadcast Channel with Imperfect CSI
José P. González-Coma, Michael Joham, Paula M. Castro +1
We consider the design of linear precoders and receivers in a Multiple-Input Single-Output (MISO) Broadcast Channel (BC). We aim at minimizing the transmit power while fullfiling a…
Experimental Evaluation of Interference Alignment for Broadband WLAN Systems
Christian Lameiro, Óscar González, José A. García-Naya +2
In this paper we present an experimental study on the performance of spatial Interference Alignment (IA) in indoor wireless local area network scenarios that use Orthogonal Frequen…