Ara es mostren els items 23-39 de 39

    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...
    • Low-cost test measurement setup for real IoT BLE sensor device characterization 

      Pérez Díaz de Cerio, David; Hernandez Solana, Angela; Valdovinos, Antonio; Olmos Bonafé, Juan José; Valenzuela González, José Luis (2019-03-01)
      Article
      Accés obert
      The methodology presented in this paper aims to characterize impairments shown by real devices which are usually neglected on standardized tests but that become very important in massive IoT scenarios. For instance, we ...
    • 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)
      Text en actes de congrés
      Accés obert
      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)
      Text en actes de congrés
      Accés obert
      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 ...
    • On the use of sniffers for spectrum occupancy measurements of Bluetooth low energy primary channels 

      Valenzuela Pérez, Ana; García Lozano, Mario; Valenzuela González, José Luis; Pérez Díaz de Cerio, David; Hernandez Solana, Angela; Valdovinos, Antonio (Elsevier, 2022-08-01)
      Article
      Accés obert
      The methods usually employed to measure channel occupancy show limitations in the context of Bluetooth Low Energy (BLE) advertisements. We propose and analyze the use of BLE sniffers as light and portable low-cost spectrum ...
    • 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)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      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)
      Text en actes de congrés
      Accés obert
      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
      Accés obert
      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
      Accés obert
      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, Oriol; Valenzuela González, José Luis; Agustí Comes, Ramon (Edicions UPC, 2003)
      Llibre
      Accés restringit als usuaris de la UB, UAB, UPC, UPF, UdG, UdL, URV, UOC, BC, UVic, UJI, URL, UIC
      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 ...
    • Proposal and evaluation of BLE discovery process based on new features of bluetooth 5.0 

      Hernandez Solana, Angela; Pérez Díaz de Cerio, David; Valdovinos, Antonio; Valenzuela González, José Luis (MDPI AG, 2017-09-01)
      Article
      Accés obert
      The device discovery process is one of the most crucial aspects in real deployments of sensor networks. Recently, several works have analyzed the topic of Bluetooth Low Energy (BLE) device discovery through analytical or ...
    • Provisioning vehicular services and communications based on a bluetooth sensor network deployment 

      Pérez Díaz de Cerio, David; Valenzuela González, José Luis (2015-06-01)
      Article
      Accés obert
      It is very common to rule out Bluetooth as a suitable technology for vehicular communications. The reasons behind this decision usually result from misconceptions such as accepting that Bluetooth has a short application ...
    • PSM-DMO: power save mode and discontinuous BLE mesh operation 

      Hernandez Solana, Angela; Pérez Díaz de Cerio, David; García Lozano, Mario; Valdovinos, Antonio; Valenzuela González, José Luis (2022-08-04)
      Article
      Accés obert
      The Bluetooth Low Energy (BLE) mesh profile, standardized by the Bluetooth Special Interest Group (SIG), has an increasing interest in IoT solutions. However, the standard assumes that relay and friend nodes should be ...
    • Research activities at WiComTec-UPC research group 

      Ruiz Boqué, Sílvia; García Lozano, Mario; Pérez Díaz de Cerio, David; Valenzuela González, José Luis; Olmos Bonafé, Juan José; Alonso Zárate, Luis Gonzaga; Joud, Mohammad (2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper is an introduction of the main research activities in which the Wireless Communications and Technologies research group (WiComTec-UPC) is involved now or has planned for the next years, oriented to disseminate ...
    • Speeding up bluetooth mesh 

      Pérez Díaz de Cerio, David; Hernandez Solana, Angela; García Lozano, Mario; Valdovinos Bardají, Antonio; Valenzuela González, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
      Article
      Accés obert
      Bluetooth has constantly evolved from its cradle in 1997 to the last 5.2 version in 2020. With each update and amendment, it has gained in speed, range, and versatility. One of the latest introductions was the Bluetooth ...
    • The help4mood wearable sensor network for inconspicuous activity measurement 

      Pérez Díaz de Cerio, David; Ruiz Boqué, Sílvia; Rosell Ferrer, Francisco Javier; Ramos Castro, Juan José; Valenzuela González, José Luis; Colomé Castellví, Josep Maria (2013-08)
      Article
      Accés restringit per política de l'editorial
      The Help4Mood EU FP7 project (H4M) [1] proposes to significantly advance the state-ofthe-art in computerized support for people with Major Depression by monitoring mood, physical activity and voice characteristics while ...
    • Trimming the power consumption of domestic Wi-Fi networks: how much power does your router need? 

      Pérez Díaz de Cerio, David; González Rodríguez, Marta; Valenzuela González, José Luis; González Arbesú, José María (2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work is part of a project where the goals are: designing energetically-optimum domestic WiFi routers; obtaining real and accurate power consumed models as a function of router configuration, and providing the ...