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Ara es mostren els items 158-177 de 201

    • Performance analysis of a cluster-based MAC protocol for wireless ad hoc networks 

      Alonso Zárate, Jesús; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2010)
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    • Performance analysis of a distributed queuing MAC protocol for Ad-Hoc networks with different mobility conditions 

      Alonso Zárate, Jesús; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (King' s College London, 2005)
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      This paper analyses the performance of the DQCA AD HOC MAC protocol for scenarios where the communication nodes have different mobility conditions, corresponding to different applications such as sensor networks, ...

    • Performance analysis of a medium-transparent MAC protocol for 60GHz radio-over-fiber networks 

      Kalfas, George; Pleros, Nikos; Tsagkaris, Kostas; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (IEEE, 2011)
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      We demonstrate for the first time an analytical model for computing the saturation throughput of a Medium- Transparent MAC protocol in 60GHz Radio-over-Fiber networks, assuming a finite number of terminals and ideal channel ...

    • Performance analysis of a persistent relay carrier sensing multiple access protocol 

      Alonso Zárate, Luis Gonzaga; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2009-12)
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    • Performance analysis of IEEE 802.11 Ad hoc networks with cooperative ARQ in the presence of hidden and exposed terminals 

      Alonso Zárate, Luis Gonzaga; Kormentzas, Georgios; Alonso Zárate, Jesús; Verikoukis, Christos (2009)
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    • Performance enhancement of DQMAN-based wireless ad hoc networks in multi-hop scenarios 

      Alonso Zárate, Jesús; Verikoukis, Christos; Kartsakli, Elli; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2008-05-31)
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      Two mechanisms to improve the performance of wireless ad hoc networks in multi-hop scenarios wherein the distributed queuing MAC protocol for mobile ad hoc networks (DQMAN) is executed are proposed and evaluated in this ...

    • Performance evaluation of a cooperative scheme for wireless networks 

      Alonso Zárate, Jesús; Gómez, J; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2006-09-30)
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      It has been shown that the cooperation among nodes can improve the performance of a network under certain considerations. So far, research focus has been mainly put on cooperation and not on the coordination required to ...

    • Performance evaluation of a medium access control protocol for a distributed ARQ scheme in cooperative wireless networks 

      Alonso Zárate, Jesús; Giotis, P; Kartsakli, Elli; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2008-06-30)
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      A performance evaluation of a medium access control protocol for a distributed ARQ scheme in cooperative wireless networks is presented in this paper. The protocol under evaluation is the Persistent Relay Carrier Sensing ...

    • Performance evaluation of directional antenna-assisted MAC protocols in the presence of mobility 

      Alonso Zárate, Luis Gonzaga; Verikoukis, Christos; Koutsopoulos, Iordanis (National Technical University of Athens, 2006)
      Comunicació de congrés
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      Adaptive antenna arrays, access conttol protocols, user mobility, location caching, multiple transceivers

    • Performance evaluation of frame slotted-ALOHA with succesive interference cancellation in machine-to-machine networks 

      Vázquez-Gallego, Francisco; Rietti, Marc; Bas, Joan; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga (VDE Conference Publications, 2014)
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      Machine-to-Machine (M2M) area networks connect a gateway with a huge number of energy-constrained end-devices. Therefore, energy efficiency is essential to prolong the lifetime of M2M networks. In this paper, we consider ...

    • Performance of DVB-T2 improvements over low doppler mobile channels 

      Ruiz Boqué, Sílvia; López Arranz, Carlos Alberto; Enrique Herrero, Carlos; Alonso Zárate, Luis Gonzaga; Olmos Bonafé, Juan José; García Lozano, Mario; Minerva, Flaminio (2010)
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      This paper addresses the simulation and the detailed analysis of some performance indicators and graphics of the changes in channel coding and modulation envisaged for DVB-T2. Results are given not only for ideal ...

    • Persistent RCSMA: a MAC protocol for a distributed cooperative ARQ scheme in wireless networks 

      Alonso-Zárate, Jesús; Kartsakli, Elli; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (HINDAWI, 2008-04-09)
      Article
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      The persistent relay carrier sensing multiple access (PRCSMA) protocol is presented in this paper as a novel medium access control (MAC) protocol that allows for the execution of a distributed cooperative automatic ...

    • Proposal Of DQRAP/CDMA MAC protocol optimization 

      Giovanini, G; Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 2001)
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      Future third-generation mobile communication systems will need MAC protocols suitable for multimedia CDMA radio communications. DQRAP/CDMA (distributed queueing random access protocol/CDMA) is a general purpose MAC protocol ...

    • QoS guarantee for wireless LAN with heterogeneous traffic 

      Alonso Zárate, Luis Gonzaga; Kartsakli, Elli; Alonso Zárate, Jesús; Verikoukis, Christos (2009)
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      Distributed Queuing Collision Avoidance (DQCA) is an efficient MAC protocol designed for infrastructure Wireless LANs. In this paper, four algorithms are proposed that alter the FIFO scheduling order of DQCA in order to ...

    • Reliable MAC design for ambient assisted living: moving the coordination to the cloud 

      Kartsakli, Elli; Antonopoulos, Angelos; Lalos, Aristeidis; Tennina, Stefano; Di Renzo, Marco; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2015-01)
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      Accés restringit per política de l'editorial
      Ambient Assisted Living (AAL) technologies constitute a new paradigm that promises quality of life enhancements in chronic-care patients and elderly people. From a communication perspective, they involve heterogeneous ...

    • Reliable machine-to-machine multicast services with multi-radio cooperative retransmissions 

      Laya, Andrés; Alonso Zárate, Luis Gonzaga; Alonso-Zárate, Jesús; Chatzimisios, Periklis (2015-02)
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      The 3GPP is working towards the definition of service requirements and technical solutions to provide support for energy-efficient Machine Type Communications (MTC) in the forthcoming generations of cellular networks. One ...

    • 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)
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      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 ...

    • Reservation dynamic frame slotted-ALOHA for wireless M2M networks with energy harvesting 

      Vázquez-Gallego, Francisco; Alonso-Zárate, Jesús; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      We consider a wireless Machine-to-Machine (M2M) area network where a gateway periodically collects data from a group of end-devices equipped with energy harvesters. While the use of energy harvesters ideally provides ...

    • Resource allocation techniques for heterogeneous networks under user misbehavior 

      Miliotis, Vasileios; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2016-03)
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      In this letter we focus on the uplink offloading with IP Flow Mobility (IFOM). With IFOM a User Equipment (UE) is able to maintain concurrently two data streams, one through LTE and the other through WiFi. We consider the ...

    • RLNC-aided cooperative compressed sensing for energy efficient vital signal telemonitoring 

      Lalos, Aristeidis; Antonopoulos, Angelos; Kartsakli, Elli; Di Renzo, Marco; Tennina, Stefano; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2015-07-01)
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      Wireless body area networks (WBANs) are composed of sensors that either monitor and transmit vital signals or act as relays that forward the received data to a body node coordinator (BNC). In this paper, we introduce an ...