Now showing items 1-20 of 23

    • A cost-effective IoT system for monitoring Indoor radon gas concentration 

      Blanco Novoa, Óscar; Fernández-Caramés, Tiago M.; Fraga-Lamas, Paula; Castedo, Luis (M D P I AG, 2018-07-08)
      [Abstract] Radon is a noble gas originating from the radioactive decay chain of uranium or thorium. Most radon emanates naturally from the soil and from some building materials, so it can be found in many places around the ...
    • A MATLAB Interface for Analyzing Conformal Arrays Composed of Polarized Heterogeneous Elements 

      Bregains, Julio; García-Naya, José A.; González López, Miguel; Castedo, Luis (Institute of Electrical and Electronics Engineers, 2011-10)
      [Abstract] As an extension and improvement of a previous work, this paper presents a graphical interface designed with MATLAB®, which is capable of representing both the spatial and electrical configurations of a conformal ...
    • A Practical Evaluation of a High-Security Energy-Efficient Gateway for IoT Fog Computing Applications 

      Suárez-Albela, Manuel; Fernández-Caramés, Tiago M.; Fraga-Lamas, Paula; Castedo, Luis (M D P I AG, 2017-08-29)
      [Abstract] Fog computing extends cloud computing to the edge of a network enabling new Internet of Things (IoT) applications and services, which may involve critical data that require privacy and security. In an IoT fog ...
    • A Review on Internet of Things for Defense and Public Safety 

      Fraga-Lamas, Paula; Fernández-Caramés, Tiago M.; Suárez-Albela, Manuel; Castedo, Luis; González-López, Miguel (Multidisciplinary Digital Publishing Institute, 2016)
      [Abstract], The Internet of Things (IoT) is undeniably transforming the way that organizations communicate and organize everyday businesses and industrial procedures. Its adoption has proven well suited for sectors that ...
    • A WiMAX Conformal Broad-Beam Antenna 

      Bregains, Julio; Castedo, Luis; Ares Pena, F. J. (Institute of Electrical and Electronics Engineers, 2010-12)
      [Abstract] The numerical model of a very simple conformal antenna, prepared to work in the 3.4 to 3.6 GHz WiMAX range, is presented. The pattern radiated by the proposed antenna displays high gain and excellent linear ...
    • An Electricity Price-Aware Open-Source Smart Socket for the Internet of Energy 

      Blanco-Novoa, Óscar; Fernández-Caramés, Tiago M.; Fraga-Lamas, Paula; Castedo, Luis (M D P I AG, 2017-03-21)
      [Abstracts] The Internet of Energy (IoE) represents a novel paradigm where electrical power systems work cooperatively with smart devices to increase the visibility of energy consumption and create safer, cleaner and ...
    • Analog Video Encoding and Quality Evaluation 

      Balsa, José; Fresnedo, Óscar; García-Naya, José A.; Domínguez-Bolaño, Tomás; Castedo, Luis (M D P I AG, 2019-07-23)
      [Abstract] The most widespread analog video encoding systems in the literature are based on the use of the 2D and 3D DCT. These systems use both transformations indistinctly without assessing their suitability. In this ...
    • Analysis, Design and Empirical Validation of a Smart Campus Based on LoRaWAN 

      Fraga-Lamas, Paula; Celaya-Echarri, Mikel; López Iturri, Peio; Fernández-Caramés, Tiago M.; Azpilicueta, Leyre; Aguirre, Erik; Suárez Albela, Manuel; Falcone, Francisco; Castedo, Luis (MDPI, 2019)
      [Abstract] Internet of Things (IoT) applications for smart environments demand challenging requirements for wireless networks in terms of security, coverage, availability, power consumption, and scalability. The technologies ...
    • Clock frequency Impact on the performance of high-security cryptographic cipher suites for energy-efficient resource-constrained IoT devices 

      Suárez-Albela, Manuel; Fraga-Lamas, Paula; Castedo, Luis; Fernández-Caramés, Tiago M. (M D P I AG, 2018-12-20)
      [Abstract] Modern Internet of Things (IoT) systems have to be able to provide high-security levels, but it is difficult to accommodate computationally-intensive cryptographic algorithms on the resource-constrained hardware ...
    • Design and Experimental Validation of a LoRaWAN Fog Computing Based Architecture for IoT Enabled Smart Campus Applications 

      Fraga-Lamas, Paula; Celaya-Echarri, Mikel; Lopez-Iturri, Peio; Castedo, Luis; Azpilicueta, Leyre; Aguirre, Erik; Suárez-Albela, Manuel; Falcone, Francisco; Fernández-Caramés, Tiago M. (M D P I AG, 2019-07-26)
      [Abstract] A smart campus is an intelligent infrastructure where smart sensors and actuators collaborate to collect information and interact with the machines, tools, and users of a university campus. As in a smart city, ...
    • Design, Implementation and Practical Evaluation of an IoT Home Automation System for Fog Computing Applications Based on MQTT and ZigBee-WiFi Sensor Nodes 

      Froiz Míguez, Iván; Fernández-Caramés, Tiago M.; Fraga-Lamas, Paula; Castedo, Luis (M D P I AG, 2018-08-13)
      [Abstract] In recent years, the improvement of wireless protocols, the development of cloud services and the lower cost of hardware have started a new era for smart homes. One such enabling technologies is fog computing, ...
    • Image Transmission: Analog or Digital? 

      Balsa González, José Francisco; Domínguez Bolaño, Tomás; Fresnedo Arias, 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; Bregains, 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 ...
    • On the feasibility of time-modulated arrays for digital linear modulations: a theoretical analysis 

      Maneiro Catoira, Roberto; Bregains, 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 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 ...
    • 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 ...
    • Time Modulated Arrays: From their Origin to Their Utilization in Wireless Communication Systems 

      Maneiro-Catoira, Roberto; Bregains, 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 ...
    • Towards the Internet of Smart Trains: A Review on Industrial IoT-Connected Railways 

      Fraga-Lamas, Paula; Fernández-Caramés, Tiago M.; Castedo, Luis (M D P I AG, 2017-06-21)
      [Abstract] Nowadays, the railway industry is in a position where it is able to exploit the opportunities created by the IIoT (Industrial Internet of Things) and enabling communication technologies under the paradigm of ...