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Ara es mostren els items 151-170 de 201

    • Offloading with IFOM: the uplink case 

      Miliotis, Vasileios; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (2014)
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      Mobile data offloading has been proposed as a solution for network congestion. However, the majority of the state-of-the-art is focused on the downlink offloading, while the change of mobile user habits, like mobile content ...

    • 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)
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      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 impact of repeaters deployment on WCDMA networks planning 

      García Lozano, Mario; Alonso Zárate, Luis Gonzaga; Casadevall Palacio, Fernando José; Ruiz Boqué, Sílvia; Correia, L M (Institute of Electrical and Electronics Engineers (IEEE), 2006)
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      This paper addresses the analysis of WCDMA systems with repeaters deployment. The real different path delays, taking into account the repeaters presence and the finite nature of the time window of Rake receivers are ...

    • On the impact of shadowing on the performance of cooperative medium access control protocols 

      Di Renzo, Marco; Alonso Zárate, Jesús; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (IEEE, 2011)
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      Accurate representation of the physical layer is instrumental for a sound design and optimization of Medium Access Control (MAC) protocols for cooperative wireless networks. However, the vast majority of MAC protocols ...

    • Opportunistic scheduling for WLAN systems using cross-layer techniques and a distributed MAC 

      Cateura, A; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (Institute of Electrical and Electronics Engineers (IEEE), 2005)
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      This paper proposes a novel Cross-Layer optimization mechanism for WLAN systems and analyses its performance in terms of throughput and mean packet delay. The proposed scheme makes use of a MAC-PHY interaction and a ...

    • 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)
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      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 ...

    • Optimizing MAC layer performance based on a distributed queuing protocol for wireless sensor networks 

      Begonya, Otal; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga (Institute of Electrical and Electronics Engineers (IEEE), 2008)
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      This paper analyzes the performance of a MAC scheme for low-rate wireless sensor networks that makes use of distributed queues to improve radio channel utilization. Analytical values first for the throughput performance, ...

    • 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)
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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)
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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 ...