Now showing items 1-20 of 25

  • A low-cost tracking system for running race applications based on bluetooth low energy technology 

    Pérez Díaz de Cerio, David; Hernandez Solana, Angela; Valdovinos, Antonio; Valenzuela González, José Luis (Multidisciplinary Digital Publishing Institute (MDPI), 2018-03-20)
    Article
    Open Access
    Timing points used in running races and other competition events are generally based on radio-frequency identification (RFID) technology. Athletes’ times are calculated via passive RFID tags and reader kits. Specifically, ...
  • Alternativas en el desarrollo de aplicaciones para móviles 

    Valenzuela González, José Luis; Sallent Roig, José Oriol; Bodas, J; Fernández, Victor (ETSETB UPC, 2000)
    Conference report
    Open Access
    Cuando se alcanza la etapa de madurez del mercado GSM, como sería el caso de España, se impulsan nuevos servicios y aplicaciones para móviles, cuyo desarrollo puede fundamentarse en diversas tecnologías. En esta comunicación ...
  • Analytical and experimental performance evaluation of BLE neighbor discovery process including non-idealities of real chipsets 

    Pérez Díaz de Cerio, David; Hernández, Ángela; Valenzuela González, José Luis; Valdovinos, Antonio (MDPI AG, 2017-03-03)
    Article
    Open Access
    The purpose of this paper is to evaluate from a real perspective the performance of Bluetooth Low Energy (BLE) as a technology that enables fast and reliable discovery of a large number of users/devices in a short period ...
  • An experimental study of multi-radio platform coexistence in the 5 GHz band for railway applications 

    Vlad, Adrián; Hierro, José; González, Jesús; Martinez, R.; Navarro, Isabel; Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Collado Gómez, Juan Carlos; González Arbesú, José María; Alonso Zárate, Luis Gonzaga; Valenzuela González, José Luis; Laya Romero, Andrés Ernesto; Flores, Enrique (Springer Verlag, 2011)
    Conference report
    Restricted access - publisher's policy
    This paper studies the practical challenges that arise due to the coexistence of two wireless technologies, both operating in the license-exempt 5 GHz band. In particular, WiFi and WiMAX equipment have been used in the ...
  • Anti-collision adaptations of BLE active scanning for dense IoT tracking applications 

    Hernandez Solana, Angela; Pérez Díaz de Cerio, David; Valdovinos, Antonio; Valenzuela González, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2018-09-15)
    Article
    Open Access
    Bluetooth low energy (BLE) is one of most promising technologies to enable the Internet-of-Things (IoT) paradigm. The BLE neighbor discovery process (NDP) based on active scanning may be the core of multiple IoT applications ...
  • Audit of a real Wi-Fi deployment to provide data, VoIP communications and an IIoT item location service 

    Pérez Díaz de Cerio, David; Valenzuela González, José Luis; García Lozano, Mario (Academy Publisher, 2017-10-17)
    Article
    Restricted access - publisher's policy
    As the number of Access Points and stations sharing the unlicensed ISM (Industrial Scientific Medical) bands increases, interference diminishes the theoretical performance of 802.11 standard. This paper presents results ...
  • Bluetooth Low Energy sensor networks for railway applications 

    Hernandez Solana, Angela; Valdovinos, Antonio; Pérez Díaz de Cerio, David; Valenzuela González, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference lecture
    Open Access
    This paper analyzes the viability of Bluetooth Low Energy (BLE) as the enabling technology in railway scenarios to allow sensor data transmission from ground to train. This proposal is based on using the broadcasting ...
  • Comunicaciones via radio: analisis corporativo de las prestaciones técnicas de igualación con modelos de canal y medidas de canal experimentales 

    Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José; Valenzuela González, José Luis (Universitat Politècnica de València, 1993)
    Conference report
    Open Access
  • Experimental study of Bluetooth, ZigBee and IEEE 802.15.4 technologies on board high-speed trains 

    Higuera, Jorge; Kartsakli, Elli; Valenzuela González, José Luis; Alonso Zárate, Luis Gonzaga; Laya Romero, Andrés Ernesto; Martínez, Raquel; Aguilar, Alicia (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The presented ...
  • Experimental study of bluetooth, ZigBee and IEEE 802.15.4 technologies on board high-speed trains 

    Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Valenzuela González, José Luis; Alonso Zárate, Luis Gonzaga; Laya Romero, Andrés Ernesto; Martínez, Raquel; Aguilar, Alicia (2012)
    Article
    Restricted access - publisher's policy
    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The ...
  • Filtenna integration achieving ideal chebyshev return losses 

    Hueltes Escobar, Alberto; Verdú Tirado, Jorge Andrés; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rocas Cantenys, Eduard; Valenzuela González, José Luis (2014-04-01)
    Article
    Open Access
    This paper demonstrates that it is possible to find an ideal filter response (Chebyshev, Butterworth,..) considering the antenna as the last resonator of a filter under certain circumstances related with the antenna ...
  • Help4Mood: a computational distributed system to support the treatment of patients with major depression 

    Pérez Díaz de Cerio, David; Valenzuela González, José Luis; Ruiz Boqué, Sílvia; García Lozano, Mario; Colomé, Josep Maria (2011)
    Conference report
    Restricted access - publisher's policy
    A closed loop approach supporting the control, communication and treatment management of patients with Major Depression is presented, based on a distributed system with three main components: a Personal Monitoring System, ...
  • La evaluación en PBL: un caso práctico 

    García Lozano, Mario; Pérez Díaz de Cerio, David; Valenzuela González, José Luis; Gelonch Bosch, Antonio José; Alonso Zárate, Luis Gonzaga; Ruiz Boqué, Sílvia (2008)
    Conference report
    Restricted access - publisher's policy
    Las ventajas de estructurar una asignatura, un conjunto o incluso todo un plan de estudios mediante Aprendizaje Basado en Proyectos (PBL) han sido ampliamente expuestas de forma teórica y práctica ...
  • Multipolling and OFDMA Reservation Protocol for IEEE 802.11 Networks 

    Pérez Díaz de Cerio, David; Valenzuela González, José Luis; Villares Piera, Nemesio Javier (Institute of Electrical and Electronic Engineers, 2009)
    Conference report
    Open Access
    This paper presents an efficient multipolling scheme that improves the IEEE 802.11 MAC protocol efficiency and does not suffer from the hidden terminal problem or inefficient channel usage problems. To design an efficient ...
  • On the feasibility of Bluetooth, Zigbee and IEEE 802.15.4 technologies on board high speed trains 

    Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Valenzuela González, José Luis; Alonso Zárate, Luis Gonzaga (2011)
    Conference report
    Open Access
    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional land-to-train communication. The presented ...
  • Opportunistic scheduling using an enhanced channel state information update scheme for WLAN systems with DQCA 

    Higuera Portilla, Jorge Eduardo; Kartsakli, Elli; Valenzuela González, José Luis; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2007)
    Conference lecture
    Restricted access - publisher's policy
    This paper studies the feasibility of using low-power wireless technologies such as Bluetooth, IEEE 802.15.4 and ZigBee in high-speed railway scenarios that involve bidirectional ground-to-train communication. The presented ...
  • Performance of adaptive bayesian equalizers in outdoor environments 

    Valenzuela González, José Luis; Casadevall Palacio, Fernando José (IEEE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC., 1997)
    Conference report
    Open Access
    Outdoor communications are affected by multipath propagation that imposes an upper limit on the system data rate and restricts possible applications. In order to overcome the degrading effect introduced by the channel, ...
  • Performance of blind equalization with higher order statistics in indoor radio environments 

    Valenzuela González, José Luis; Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-05)
    Article
    Open Access
    This paper analyzes the performance of blind equalization using the complex cepstrum of third-order moments applied to 4-QAM time division multiple access (TDMA) indoor radio communication systems. In particular, we have ...
  • Performance of Blind Equalization with Higher Order Statistics in Indoor Radio Environments 

    Valenzuela González, José Luis; Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José (1997-05)
    Article
    Open Access
    This paper analyzes the performance of blind equalization using the complex cepstrum of third-order moments applied to 4-QAM time division multiple access (TDMA) indoor radio communication systems. In particular, we have ...
  • Principios de comunicaciones móviles 

    Sallent Roig, José Oriol; Valenzuela González, José Luis; Agustí Comes, Ramon (Edicions UPC, 2003)
    Book
    Restricted access to UB, UAB, UPC, UPF, UdG, UdL, URV, UOC, BC, UVic, UJI, URL, UIC users
    En este libro se presentan los aspectos fundamentales que intervienen en los sistemas de comunicaciones móviles, al objeto de facilitar la comprensión de los principios de funcionamiento y los requerimientos tanto actuales ...