Listar Grupo de Tecnoloxía Electrónica e Comunicacións (GTEC) por título

Mostrando ítems 170-189 de 218

    • QoS constrained power minimization in the MISO broadcast channel with imperfect CSI 

      González-Coma, José P.; Joham, Michael; Castro-Castro, Paula-María; Castedo, Luis (Elsevier, 2017-02)
      [Abstract]: In this paper we consider the design of linear precoders and receivers in a Multiple-Input Single-Output (MISO) Broadcast Channel (BC). We aim to minimize the transmit power while meeting a set of per-user ...

    • QoS constrained power minimization in the multiple stream MIMO broadcast channel 

      González-Coma, José P.; Joham, Michael; Castro-Castro, Paula-María; Castedo, Luis (Elsevier, 2018-02)
      [Abstract]: 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 each user. We further consider ...

    • Rank Constrained Precoding for the Downlink of mmWave Massive MIMO Hybrid Systems 

      González-Coma, José P.; Fresnedo, Óscar; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2021-02-11)
      [Abstract] The hybrid design of precoding schemes for millimeter-wave communications allows exploiting the gains by using large antenna array with an affordable hardware cost and power consumption. In this work, we present ...

    • Real-time multimedia coding and transmission 

      García-Naya, José A.; López-Granado, Otoniel; Dapena, Adriana; Marcellin, Michael W; Cruz-Chavez, Marco (SpringerOpen & European Association for Signal Processing, 2013)
      [Abstract]: This paper sums up relevant topics covered by the special issue titled ‘Real-Time Multimedia Coding and Transmission’, including efficient content representation, multimedia transmission, hardware and software ...

    • Real-time validation of a SDR implementation of TDD WiMAX standard 

      Carro Lagoa, Ángel; Suárez-Casal, Pedro; Fraga-Lamas, Paula; García-Naya, José A.; Castedo, Luis; Morales-Méndez, Antonio (The Wireless Innovation Forum, 2013)
      [Abstract]: This paper focuses on the validation of an innovative software- defined radio architecture for a WiMAX system based on commercially available field-programmable gate array and digital signal processor modules. ...

    • Reply to “Comments on ‘Combining Switched TMAs and FDAs to Synthesize Dot-Shaped Beampatterns”’ 

      Maneiro-Catoira, Roberto; Brégains, Julio; García-Naya, José A.; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2021)
      [Abstract]: It is noted that the main innovation contained lies in the consideration of frequency diverse arrays (FDAs) feeding networks made up of time-modulating switches (hence, the term TMA-FDA) instead of phase shifters. ...

    • Reverse Engineering and Security Evaluation of Commercial Tags for RFID-Based IoT Applications 

      Fernández-Caramés, Tiago M.; Fraga-Lamas, Paula; Suárez-Albela, Manuel; Castedo, Luis (Multidisciplinary Digital Publishing Institute, 2017)
      [Abstract], 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 communications in order to collect ...

    • Robust Precoding with Bayesian Error Modeling for Limited Feedback MU-MISO Systems 

      Joham, Michael; Castro-Castro, Paula-María; Castedo, Luis; Wolfgang, Utschick (IEEE, 2010)
      [Abstract] We consider the robust precoder design for multiuser multiple-input single-output (MU-MISO) systems where the channel state information (CSI) is fed back from the single antenna receivers to the centralized ...

    • Robust Precoding with Limited Feedback Design based on Precoding MSE for MU-MISO Systems 

      Joham, Michael; Castro-Castro, Paula-María; Utschick, Wolfgang; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2012-06)
      [Abstract] For the separation of the signals in the vector broadcast channel (BC), some information about the channel state is necessary at the transmitter. In many cases, this channel state information (CSI) must be fed ...

    • Service-Learning methodology to develop Bachelor’s Thesis in Information and Computer Science Degrees 

      Castro-Castro, Paula-María; Fresnedo, Óscar; Dapena, Adriana; Pereira-Loureiro, Javier; Vázquez Araújo, Francisco Javier (PKP Publishing Services Network, 2024)
      [Abstract]: Service-Learning (SL) is a powerful methodology to acquire competences and values in Higher Education. However, there is still no widespread use in Information and Computer Science (ICS) degrees where most of ...

    • Service-Learning Projects in University Degrees Based on Sustainable Development Goals: Proposals and Results 

      Castro-Castro, Paula-María; Ares-Pernas, Ana; Dapena, Adriana (MDPI AG, 2020-09-25)
      [Abstract] We present several Service-Learning projects developed considering Sustainable Development Goals to provide the students skills for the support of a sustainable society. This project begins with collecting ...

    • SiDIVS: Simple Detection of Inductive Vehicle Signatures with a Multiplex Resonant Sensor 

      Lamas-Seco, José J.; Castro-Castro, Paula-María; Dapena, Adriana; Vázquez Araújo, Francisco Javier (Multidisciplinary Digital Publishing Institute, 2016)
      This work provides a system capable of obtaining simultaneous inductive signatures of vehicles traveling on a roadway with minimal cost. Based on Time-Division Multiplexing (TDM) with multiple oscillators, one for each ...

    • Smart Pipe System for a Shipyard 4.0 

      Fraga-Lamas, Paula; Noceda-Davila, Diego; Fernández-Caramés, Tiago M.; Díaz-Bouza, Manuel A.; Vilar-Montesinos, Miguel A. (Multidisciplinary Digital Publishing Institute, 2016)
      [Abstract] As a result of the progressive implantation of the Industry 4.0 paradigm, many industries are experimenting a revolution that shipyards cannot ignore. Therefore, the application of the principles of Industry 4.0 ...

    • Study of Machine Learning Techniques for EEG Eye State Detection 

      Laport López, Francisco; Castro-Castro, Paula-María; Dapena, Adriana; Vázquez Araújo, Francisco Javier; Iglesia, Daniel I. (MDPI AG, 2020-08-31)
      [Abstract] A comparison of different machine learning techniques for eye state identification through Electroencephalography (EEG) signals is presented in this paper. (1) Background: We extend our previous work by studying ...

    • Synthesis of Multi-Radial Line Antenna for HIPERLAN 

      Brégains, Julio; Ares Pena, F. J.; Franceschetti, G.; Roederer, A. G. (The Institution of Engineering and Technology, 2003-08)
      [Abstract] We present a new antenna concept - the multi-radial travelling wave line antenna - that achieves a broadband conical radiation pattern suitable for use in multiple C-band wireless computer networks.

    • Synthesis of Multiple-Pattern Planar Antenna Arrays with Single Prefixed or Jointly Optimized Amplitude Distributions 

      Brégains, Julio; Trastoy, A.; Ares Pena, F. J.; Moreno Piquero, E. (John Wiley & Sons, Inc., 2002-01-05)
      [Abstract] Previous work on the generation of multiple radiation patterns by a single linear array antenna with an unchanging excitation amplitude distribution is generalized to planar arrays. The amplitude distribution ...

    • Teaching and Learning IoT Cybersecurity and Vulnerability Assessment with Shodan through Practical Use Cases 

      Fernández-Caramés, Tiago M.; Fraga-Lamas, Paula (MDPI AG, 2020-05-27)
      [Abstract] Shodan is a search engine for exploring the Internet and thus finding connected devices. Its main use is to provide a tool for cybersecurity researchers and developers to detect vulnerable Internet-connected ...

    • Testbed-Assisted Learning for Digital Communications Courses 

      García-Naya, José A.; Castro-Castro, Paula-María; González-López, Miguel; Dapena, Adriana (John Wiley & Sons, 2013-09)
      [Abstract] We introduce testbed-assisted learning as an effective means for teaching digital communications. Laboratory teaching activities of digital communications courses benefit very much from utilizing a hardware ...

    • Time Modulated Arrays: from their Origin to Their Utilization in Wireless Communication Systems 

      Maneiro-Catoira, Roberto; Brégains, Julio; García-Naya, José A.; Castedo, Luis (M D P I AG, 2017-03-14)
      [Abstract] Time-modulated arrays (TMAs) are electromagnetic systems whose radiated power pattern is controlled by the application of variable-width periodical pulses to the individual elements. The nonlinear nature of the ...

    • Time-modulated array beamforming with periodic stair-step pulses 

      Maneiro-Catoira, Roberto; Brégains, Julio; García-Naya, José A.; Castedo, Luis (Elsevier, 2020-01)
      [Abstract]: 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 direction. Beam-steering is possible ...