Listar por autor "García-Naya, José A."

Mostrando ítems 41-60 de 70

    • Hybrid Supervised-Unsupervised Channel Estimation Scheme with Dynamic Transmission of Pilots 

      Dapena, Adriana; Castro-Castro, Paula-María; García-Naya, José A. (Springer, 2011-02)
      [Abstract] Multiple-Input Multiple-Output (MIMO) digital communications standards typically include pilot symbols in the definition of the transmit signals with the purpose of acquiring the Channel State Information (CSI) ...

    • Image Transmission: Analog or Digital? 

      Balsa González, José Francisco; Domínguez-Bolaño, Tomás; Fresnedo, Óscar; García-Naya, José A.; Castedo, Luis (M D P I AG, 2018-09-18)
      [Abstract] Evaluation and comparison of analog and digital wireless transmission systems.

    • Impact of Time-Modulated Arrays on the BER of Linear Digital Modulations 

      Maneiro-Catoira, Roberto; Brégains, Julio; García-Naya, José A.; Castedo, Luis (Taylor & Francis, 2015-08-21)
      [Abstract] Time modulation provides a simple way to control the power radiation pattern of an antenna array. By appropriately selecting the parameters of a Time-Modulated Array (TMA) it is possible to obtain a reconfigurable ...

    • Interference Alignment Testbeds 

      Yetis, Cenk M.; Fanjul, Jacobo; García-Naya, José A.; Moghadam, Nima N.; Farhadi, Hamed (Institute of Electrical and Electronics Engineers, 2017)
      [Abstract]: Interference alignment has triggered high impact research in wireless communications since it was proposed nearly 10 years ago. However, the vast majority of research is centered on the theory of interference ...

    • JSCC-Cast: A Joint Source Channel Coding Video Encoding and Transmission System with Limited Digital Metadata 

      Balsa, José; Fresnedo, Óscar; García-Naya, José A.; Domínguez-Bolaño, Tomás; Castedo, Luis (MDPI, 2021)
      [Abstract] This work considers the design and practical implementation of JSCC-Cast, a comprehensive analog video encoding and transmission system requiring a reduced amount of digital metadata. Suitable applications for ...

    • Measurement-Based Characterization of Train-to-Infrastructure 2.6 GHz Propagation Channel in a Modern Subway Station 

      Domínguez-Bolaño, Tomás; Rodríguez Piñeiro, José; García-Naya, José A.; Yin, Xuefeng; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2018)
      [Abstract]: Channel characterization is essential when planning wireless communication deployments. We consider the wireless channel characterization in a modern subway station and its corresponding entrance tunnel, a topic ...

    • Measuring the physical layer performance of wireless communication systems: Part 33 in a series of tutorials on instrumentation and measurement 

      Caban, Sebastian; García-Naya, José A.; Rupp, Markus (Institute of Electrical and Electronics Engineers & Instrumentation and Measurement Society, 2011-10)
      [Abstract]: Measuring the physical layer performance of wireless radio communication systems is one important step in clearly understanding their behavior in real-world, that is, non-simulation, environments. Unfortunately, ...

    • Multi-Sensor Accurate Forklift Location and Tracking Simulation in Industrial Indoor Environments 

      Barral Vales, Valentín; Suárez-Casal, Pedro; Escudero, Carlos J.; García-Naya, José A. (M D P I AG, 2019-10-12)
      [Abstract] Location and tracking needs are becoming more prominent in industrial environments nowadays. Process optimization, traceability or safety are some of the topics where a positioning system can operate to improve ...

    • Multibeam Single-Sideband Time-Modulated Arrays 

      Maneiro-Catoira, Roberto; García-Naya, José A.; Brégains, Julio; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2020)
      [Abstract]: The design of efficient time-modulated arrays (TMAs) for multi-beam steering purposes must be based on both a type of periodical sequences that guarantees an adequate windowing of exploited harmonics, and a ...

    • NLOS Identification and Mitigation Using Low-Cost UWB Devices 

      Barral Vales, Valentín; Escudero, Carlos J.; García-Naya, José A.; Maneiro-Catoira, Roberto (M D P I AG, 2019-08-08)
      [Abstract] Indoor location systems based on ultra-wideband (UWB) technology have become very popular in recent years following the introduction of a number of low-cost devices on the market capable of providing accurate ...

    • Numerical Model of a 28-GHz Frequency Diverse Array Antenna 

      Angoue Avele, Marc Bernice; Brégains, Julio; Maneiro-Catoira, Roberto; García-Naya, José A.; Castedo, Luis (MDPI AG, 2020-08-22)
      [Abstract] In this work we make use of the frequency diverse array (FDA) concept, whose design is based upon a frequency increment across the antenna elements to generate a beam steering that is a function of angle, time ...

    • On the Feasibility of Time-Modulated Arrays for Digital Linear Modulations: a Theoretical Analysis 

      Maneiro-Catoira, Roberto; Brégains, Julio; García-Naya, José A.; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2014)
      [Abstract] Wireless communications are widely based on linear digital modulation methods, which introduce the digital baseband information in the amplitude and/or in the phase of a carrier sinusoid. Time-modulated arrays, ...

    • Performance Analysis of Time-Modulated Arrays for the Angle Diversity Reception of Digital Linear Modulated Signals 

      Maneiro-Catoira, Roberto; Brégains, Julio; García-Naya, José A.; Castedo, Luis; Rocca, Paolo; Poli, Lorenzo (Institute of Electrical and Electronics Engineers, 2017)
      [Abstract]: Diversity occurs whenever several copies of the same transmitted signal arrive at a receiver. Such a situation allows for improving the performance of a wireless communication system transmitting over a radio ...

    • Performance of MIMO systems in measured indoor channels with transmitter noise 

      Castro-Castro, Paula-María; González-Coma, José P.; García-Naya, José A.; Castedo, Luis (Springer, 2012)
      This study analyzes the impact of transmitter noise on the performance of multiple-input multiple-output (MIMO) systems with linear and nonlinear receivers and precoders. We show that the performance of MIMO linear and ...

    • Propagation modeling for outdoor-to-indoor and indoor-to-indoor wireless links in high-speed train 

      Zhang, Lei; Rodríguez Piñeiro, José; Fernández, Jean Raphaël Olivier; García-Naya, José A.; Matolak, David W.; Briso-Rodríguez, Cesar; Castedo, Luis (Elsevier, 2017)
      [Abstract]: Nowadays telecommunication companies have shown a great interest in deploying broadband mobile wireless networks in high-speed trains (HSTs) with the aim of supporting both passenger services provisioning as ...

    • 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. ...

    • Testbed design for wireless communications systems assessment 

      García-Naya, José A. (2010)
      [Abstract] Since Marconi succeeded in carrying out the first wireless transmission in 1894, experimental research has been always linked with wireless communications. Today, most wireless communications research relies ...

    • 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 ...