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  • Wireless networks group

     Casademont Serra, Jordi; Calveras Auge, Ana M.; Gomez Montenegro, Carlos; Lopez Aguilera, Maria Elena; Vidal Ferre, Rafael; Garcia Villegas, Eduard; Demirkol, Ilker Seyfettin; Oller Bosch, Joaquim; Betzler, August; Ferrer Riera, José Luís; Casals Ibañez, Lluis; Paradells Aspas, Jose
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  • Wake-up radio as an energy-efficient alternative to conventional wireless sensor networks MAC protocols

     Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Casademont Serra, Jordi; Paradells Aspas, Jose; Gamm, Gerd Ulrich; Reindl, Leonhard Michael
    ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems
    p. 173-180
    DOI: 10.1145/2507924.2507955
    Presentation's date: 2013-11
    Presentation of work at congresses

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    The use of duty-cycling in Medium Access Control (MAC) protocols effectively helps improving the energy efficiency of wireless networks. However, while the benefits of these protocols are unquestionable, most of them still suffer from overhearing and idle listening, two issues that prevent duty-cycled systems from achieving optimum energy usage, which is a crucial aspect in specific types of wireless networks such as Wireless Sensor Networks (WSN).Wake-up Radio (WuR) systems have been employed recently to overcome these issues. Under this approach, the nodes' MicroController Unit (MCU) and main radio transceiver are completely switched off and only activated when a secondary, extremely low-power receiver in the node is triggered by a particular wireless transmission. Wake-up Radio systems allow for drastic energy savings since receiver nodes are only activated on-demand, maximizing their battery lifetimes. In this paper, we have modeled and simulated a real, recent and promising WuR hardware platform based on its time and energy consumption characterization. By comparing such WuR approach to B-MAC and IEEE 802.15.4, two well-known and widely employed MAC protocols, we show it effectively out-performs the conventional WSN MAC approaches in terms of energy efficiency. To the best of authors' knowledge, this is the first study to include a comparative analysis for multi-hop networks based on a real WuR platform, which shows WuR systems represent an energy-efficient solution that also provides a good tradeoff between latency, packet delivery ratio and applicability..

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    Energy efficient wireless networking of sensor nodes  Open access

     Demirkol, Ilker Seyfettin; Paradells Aspas, Jose; Oller Bosch, Joaquim; Casademont Serra, Jordi; Calveras Auge, Ana M.; Catalan Cid, Maria Luisa
    International Conference on Sensors and Measurement Technology
    p. 452-456
    Presentation's date: 2013-05
    Presentation of work at congresses

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    Wireless sensor networks have paved the way to a new era in user applications, where information can be sensed, processed, and distributed from remote environments with minimal or no human interaction. As the sensor nodes in these networks are often battery-operated and communicate wirelessly, they are constrained by limited resources such as bandwidth, processing speed and especially by energy. Therefore, depending on the user application, different challenges are encountered for the realization of wireless sensor networks. In this paper, we will present several reallife applications along with the challenges encountered and benefits provided by the networking of the sensors for these applications.

  • Atomic Services-based Internet Architecture for Constrained and Ubiquitous Networks (ASIACUN)

     Gomez Montenegro, Carlos; Calveras Auge, Ana M.; Paradells Aspas, Jose; Casademont Serra, Jordi; Lopez Aguilera, Maria Elena; Garcia Villegas, Eduard; Vidal Ferre, Rafael; Demirkol, Ilker Seyfettin; Casals Ibañez, Lluis; Ruiz, Pedro M.; Cotrina Navau, Josep; Oller Bosch, Joaquim; Gorricho Moreno, Juan Luis; BETZLER, AUGUST
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  • ARQUITECTURA DE INTERNET BASADA EN SERVICIOS ATOMICOS PARA REDES RESTRINGIDAS Y

     Calveras Auge, Ana M.; Paradells Aspas, Jose; Vidal Ferre, Rafael; Demirkol, Ilker Seyfettin; Cotrina Navau, Josep; Lopez Aguilera, Maria Elena; Garcia Villegas, Eduard; Betzler, August; Casals Ibañez, Lluis; Gorricho Moreno, Juan Luis; Casademont Serra, Jordi; Gomez Montenegro, Carlos
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  • Time-Knocking: a novel addressing mechanism for wake-up receivers

     Oller Bosch, Joaquim; Demirkol, Ilker Seyfettin; Paradells Aspas, Jose; Casademont Serra, Jordi; Heinzelman, Wendi
    IEEE International Conference on Wireless and Mobile Computing, Networking and Communications
    p. 268-275
    DOI: 10.1109/WiMOB.2012.6379086
    Presentation's date: 2012-10
    Presentation of work at congresses

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    Wake-up radios present a promising alternative to traditional duty-cycle approaches, by reducing overhearing and by eliminating idle listening completely. However, energy-efficient operation of the wake-up mechanism is required for the success of such systems. In particular, addressing is an important component of the wake-up procedure that can consume a significant portion of the energy required. Hence, in this paper we propose a novel energy-efficient scheme for addressing. The proposed method is called Time-Knocking (TicK), since it utilizes the time duration of the MicroController Unit (MCU) sleeping to encode an address. In this paper, it is shown through mathematical analysis that TicK is much more energy efficient compared to the two common addressing mechanisms: MCU-decoding and correlator-based addressing. For realistic performance evaluations, physical measurements are performed to extract the parameter values of each method or the parameter values from well-documented off-the-shelf devices are used. TicK enables significant energy savings, especially in environments where false addressing initiations are frequent due to interference or where multiple nodes are addressed frequently.

  • Context-Aware Negotiation: the Basis for Ubiquitous Service Provisioning

     Sánchez Loro, Xavier
    Department of Telematics Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Optimizing the delivery chain in heterogenous networks

     Sánchez Loro, Xavier; Paradells Aspas, Jose; Casademont Serra, Jordi; Ferrer Riera, José Luís
    Date of publication: 2011
    Book chapter

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    Herein, we will focus on proposing a service taxonomy and classification for RBA/SOA architectures aiming to model a common framework for the description and composition of possible Atomic Ser- vices or networking functions valid for architectures coping with het- erogenous environments. The final objective is fine-tuning the delivery chain to optimize application and delivery performance and behaviour in heterogenous networks. Although our work takes the TARIFA architec- ture as the basis model for our contribution, we think it can be helpful for other architectures dealing with protocol modularization and service composition

  • Redes de comunicaciones: de la telefonía móvil a Internet

     Beltran Sanchidrian, Victòria; Calveras Auge, Ana M.; Casademont Serra, Jordi; Casals Ibañez, Lluis; Catalan Cid, Maria Luisa; Catalan Cid, Miguel; Garcia Villegas, Eduard; Gomez Montenegro, Carlos; Hesselbach Serra, Xavier; Lopez Aguilera, Maria Elena; Paradells Aspas, Jose; Sánchez Loro, Xavier; Vidal Ferre, Rafael
    Date of publication: 2010-12-01
    Book

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  • NUEVAS ARQUITECTURAS PARA INTERNET UBICUA: DISEÑO Y EVALUACION

     Garcia Villegas, Eduard; Vidal Ferre, Rafael; Lopez Aguilera, Maria Elena; Gomez Montenegro, Carlos; Cotrina Navau, Josep; Paradells Aspas, Jose; Casals Ibañez, Lluis; Casademont Serra, Jordi; Oller Bosch, Joaquim; Catalan Cid, Miguel; Ludovici, Alessandro; Ferrer Riera, Jose Luis; Catalan Cid, Maria Luisa; Demirkol, Ilker Seyfettin; Beltran Martinez, Maria Victoria; Betzler, August; Calveras Auge, Ana M.
    Competitive project

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    Detecting and mitigating the impact of wideband jammers in IEEE 802.11 WLANs  Open access

     Garcia Villegas, Eduard; Gómez, Moisés; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi
    International Wireless Communications and Mobile Computing Conference
    p. 57-61
    DOI: 10.1145/1815396.1815410
    Presentation of work at congresses

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    IEEE 802.11 Wireless LANs (WLANs) are highly sensitive to Denial of Service (DoS) attacks carried out with jamming devices. In this paper we focus on 2.4GHz wideband constant jammers. The interest in the wideband jammer lies in the fact that it beats all possible channels at the same time, leaving no possible escape following traditional channel-switching defenses. After studying and developing an effective detection mechanism, we propose the implementation of a load balancing technique based on cell breathing for mitigating the harmful effects of the jammer over an IEEE 802.11 WLAN. Cell breathing is achieved by dynamically tuning the transmission power to adjust the size of a WLAN cell.

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    Proposal of a clean slate network architecture for ubiquitous services provisioning  Open access

     Sánchez Loro, Xavier; Casademont Serra, Jordi; Paradells Aspas, Jose; Ferrer Riera, José Luís; Vidal, Albert
    International Conference on Future Information Networks
    Presentation's date: 2009-10-15
    Presentation of work at congresses

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    The Pervasive Computing field is almost always addressed from application, middleware, sensing or Human Computer Interaction perspective. Thus, solutions are usually designed at application level or involve developing new hardware. Although current layered network architectures (mainly TCP/IP stack) have enabled internetworking of lots of different devices and services, they are neither well-suited nor optimized for pervasive computing applications. Hence, we firmly believe that we should have an underlying network architecture providing the flexible, context-aware and adaptable communication infrastructure required to ease the development of ubiquitous services and applications. Herein, we propose a clean slate network architecture to deploy ubiquitous services in a Pervasive and Ubiquitous Computing environment. The architecture is designed to avoid hierarchical layering, so we propose a serviceoriented approach for a flow-oriented context-aware network architecture where communications are composed on the fly (using reusable components) according to the needs and requirements of the consumed service.

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    Impacto de mecanismos de seguridad en sensores IEEE 802.15.4  Open access

     Tripp Barba, Carolina; Casademont Serra, Jordi
    Jornadas de Ingeniería Telemática
    p. 202-208
    Presentation's date: 2009-09-16
    Presentation of work at congresses

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    En la actualidad son muchos los mecanismos de seguridad que el estándar IEEE 802.15.4 permite a las redes inalámbricas de sensores [1] Dicho estándar define las especificaciones de la Capa de Acceso al Medio y la Capa Física de los dispositivos inalámbricos de área personal. La última revisión corresponde al 2006. Dichas revisiones y actualizaciones son hechas por el grupo de trabajo 802.15. Sin embargo estos mecanismos consumen recursos como memoria y batería, que son un poco limitados en estos dispositivos. Además de contribuir a los retardos en la comunicación. Por lo cual, en el presente trabajo se presenta de manera práctica el impacto que el uso de mecanismos de seguridad tienen en el desempeño de este tipo de redes. Para ello se hizo una comparación de dicho desempeño de manera teórica basándose en lo presentado en [2], con los valores óptimos apegados a lo especificado en el estándar IEEE 802.15.4, en contraste con pruebas reales. Para estas pruebas se hizo uso del sistema operativo TinyOS [3] y de las operaciones de seguridad MAC (Capa de Acceso al Medio) ofrecidas por el chip CC2420 usado en las motas TelosB. Además se presenta el desgaste de la batería, el cual es otro punto importante que se desea conservar en los sensores.

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    Rate adaptation in 3GPP video streaming using track switching over a multihop WLAN  Open access

     Catalán, Eliseo; Casademont Serra, Jordi; Ferrer Riera, José Luís; Sánchez Loro, Xavier
    IEEE Symposium on Computers and Communications
    p. 994-999
    Presentation's date: 2009-07
    Presentation of work at congresses

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    In nowadays communication technologies, one of the main challenges to overcome is how to translate theoretical algorithms, designed protocols, existing hardware products from different manufacturers and the already knowhow into innovative applications that can produce a benefit for the user and for the commercializing firm. Following this topic, the present paper introduces an application that combines different emerging technologies: wireless mesh networks, multihop routing and adaptation of streaming delivery with the objective to create a tool for effective marketing campaigns

  • Context Acquisition and Provisioning: Dynamic Content Negotiation in Web Environments.

     Casademont Serra, Jordi; Paradells Aspas, Jose; Sanchez-Loro, X; Ferrer, J L; Beltran Querol, Vicenç; Catalán, M
    Date of publication: 2009-03
    Book chapter

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  • Dynamic content negotiation in web environments

     Sánchez Loro, Xavier; Casademont Serra, Jordi; Ferrer Riera, José Luís; Beltran Sanchidrian, Victòria; Catalan Cid, Maria Luisa; Paradells Aspas, Jose
    Date of publication: 2009
    Book chapter

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  • Improving Security Applications Using Indoor Location Systems on Wireless Sensor Networks

     Paradells Aspas, Jose; Vilaseca, Jordi; Casademont Serra, Jordi
    International Conference in Advances in Computing, Communication and Control
    p. 689-695
    Presentation of work at congresses

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  • Contributions to the Evaluation and Enhancement of WLAN IEEE 802.11 Medium Access Control Mechanism

     Lopez Aguilera, Maria Elena
    Department of Telematics Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Ubiquitous Web Access and Application Layer Optimization: Dynamic Content Negotiation over Cellular Links

     Sánchez Loro, Xavier; Beltran Sanchidrian, Victòria; Casademont Serra, Jordi; Catalan Cid, Maria Luisa
    3rd International Conference on Grid and Pervasive Computing
    Presentation's date: 2008-05-25
    Presentation of work at congresses

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  • Impact of the security mechanisms on the performance of 802.15.4/ZigBee networks

     Casademont Serra, Jordi
    Workshop in Information Security Theory and Practice
    Presentation's date: 2008-05-13
    Presentation of work at congresses

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  • Ubiquitous Web Access: Collaborative Optimization and Dynamic Content Negotiation

     Sánchez Loro, Xavier; Beltran Querol, Vicenç; Casademont Serra, Jordi; Catalan, M
    International Workshop on Interative Multimedia & Intelligent Services in MUC (IMIS '08)
    p. 2
    Presentation of work at congresses

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  • Infopoints2

     Casademont Serra, Jordi; Paradells Aspas, Jose; Garcia Villegas, Eduard
    Competitive project

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  • Impact of the security mechanisms on the performance of 802.15.4/ZigBee networks

     Gomez Montenegro, Carlos; Casademont Serra, Jordi; Paradells Aspas, Jose
    Workshop in Information Security Theory and Practice
    Presentation of work at congresses

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  • Segur@

     Casademont Serra, Jordi; Paradells Aspas, Jose; Garcia Villegas, Eduard; Gomez Montenegro, Carlos
    Competitive project

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  • Inredis

     Paradells Aspas, Jose; Casademont Serra, Jordi; Gomez Montenegro, Carlos
    Competitive project

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  • Diccionari de Telecomunicacions

     Aguilar Igartua, Mónica; Alcober Segura, Jesus Angel; Altes Bosch, Jorge; Aragones Cervera, Xavier; Artigas Garcia, David; Bardes Llorensi, Daniel; Barlabe Dalmau, Antoni; Bragos Bardia, Ramon; Calderer Cardona, Josep; Cardama Aznar, Angel; Casademont Serra, Jordi; Casals Ibañez, Lluis; Comeron Tejero, Adolfo; Cotrina Navau, Josep; Cruz Llopis, Luis Javier de La; Dios Otin, Victor Federico; Duxans Barrobes, Helena; Esparza Martin, Oscar; Esquerra Llucià, Ignasi; Garcia Vizcaino, David; Garcies Salva, Pau; Gomez Montenegro, Carlos; Gorricho Moreno, Juan Luis; Guinjoan Gispert, Francisco; Hesselbach Serra, Xavier; Liria Righetti, Antoni; Lopez Salcedo, Jose Antonio; Madrenas Boadas, Jordi; Madueño Ruiz, María Isabel; Mestre Pons, Francesc Xavier; Monte Moreno, Enrique; Morros Rubió, Josep Ramon; Muñoz Tapia, Jose Luis; Pallares Segarra, Esteve; Pons Nin, Joan; Recolons Martos, Jaume; Rincon Rivera, David; Riu Costa, Pere Joan; Ruiz Vela, Inmaculada; Pradell Cara, Lluis; Pascual Iserte, Antonio; Prat Viñas, Luis; Rey Micolau, Francesc; Villares Piera, N. Javier
    Date of publication: 2007-03
    Book

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  • Sobre la justicia en las redes IEEE 802.11e: Desincronización de su mecanismo de acceso al medio

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep
    Jornadas de Ingeniería Telemática
    p. 305-312
    Presentation of work at congresses

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  • Optimization of presence enabled services over cellular networks based on a personal proxy

     Sanchez-Loro, X; Casademont Serra, Jordi; Ferrer, J L; Paradells Aspas, Jose
    European Conference of Internet and multimedia systems and applications (EuroIMSA 2007)
    p. 1
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  • A proxy-based solution for device capabilities detection

     Sanchez-Loro, Xavier; Casademont Serra, Jordi; Ferrer, J L; Paradells Aspas, Jose
    European Conference of Internet and multimedia systems and applications (EuroIMSA 2007)
    p. 2
    Presentation of work at congresses

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  • Channel access unfairness of wireless LAN access methods

     Lopez Aguilera, Maria Elena; Heusse, M; Rousseau, F; Duda, A; Casademont Serra, Jordi
    IEEE Workshop on Local and Metropolitan Area Networks 2007 (LANMAN)
    p. 129-133
    Presentation of work at congresses

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  • Infopoints

     Casademont Serra, Jordi; Paradells Aspas, Jose
    Competitive project

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  • TEC2006-4504: Interconectividad de Redes Heterogéneas Malladas Autoconfigurables

     Paradells Aspas, Jose; Casademont Serra, Jordi; Garcia Villegas, Eduard; Gomez Montenegro, Carlos
    Competitive project

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  • Families of traceability codes based on the Chinese Remainder Theorem

     Cotrina Navau, Josep; Fernandez Muñoz, Marcel; Casademont Serra, Jordi
    2006 IEEE Information Theory Workshop
    p. 121-125
    Presentation of work at congresses

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  • Demostrador de la Televisión interactiva en el móvil

     Paradells Aspas, Jose; Casademont Serra, Jordi; Calveras Auge, Ana M.; Lopez Aguilera, Maria Elena
    Jornadas Telecom I+D
    p. 1-12
    Presentation of work at congresses

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  • 2005SGR-00366 Grupo de Redes Inalámbricas

     Casademont Serra, Jordi; Paradells Aspas, Jose; Garcia Villegas, Eduard
    Competitive project

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  • Performance of wireless LAN access methods in multicell environments

     Lopez Aguilera, Maria Elena; Heusse, M; Rousseau, F; Duda, A; Casademont Serra, Jordi
    IEEE Global Communications Conference
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  • Transmit power control mechanisms in IEEE 802.11 cellular networks

     López-Aguilera, E; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi
    International Wireless Communications and Mobile Computing Conference (IWCMC)
    p. 731-736
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  • A transmit power control proposal for IEEE 802.11 cellular networks

     Lopez-Aguilera, E; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi
    Workshop on Applications and Services in Wireless Networks
    p. 235-242
    Presentation of work at congresses

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  • Evaluating Wireles LANs Access Methods in Presence of Noise

     Lopez Aguilera, Maria Elena; Heusse, Martin; Grunenberger, Yan; Rousseau, Franck; Duda, Andrzej; Casademont Serra, Jordi
    IEEE International Conference on Computer Communications
    Presentation of work at congresses

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  • Enhancement proposal for WLAN IEEE 802.11e: Desynchronization of its Working Procedure

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep; Rojas Espinosa, Alfonso
    14th IEEE Workshop on Local and Metropolitan Area Networks, 2005
    Presentation's date: 2005-09-01
    Presentation of work at congresses

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  • Performance enhancement of WLAN IEEE 802.11 for asymmetric traffic

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep; Rojas Espinosa, Alfonso
    IEEE International Symposium on Personal Indoor and Mobile Radio Communications
    p. 1463-1467
    Presentation's date: 2005-09-01
    Presentation of work at congresses

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  • Performance enhancement of outdoor IEEE 802.11 cellular networks

     Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Rojas Espinosa, Alfonso; Cotrina Navau, Josep
    The IASTED International Conference on Wireless Networks and Emerging Technologies
    Presentation's date: 2005-07-01
    Presentation of work at congresses

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  • Inteligencia artificial: una visión sobre sus posibilidades para personas discapacitadas

     Paradells Aspas, Jose; Gomez Montenegro, Carlos; Salvatella, P; Casademont Serra, Jordi
    Congreso Internacional de Domótica, Robótica y Teleasistencia para Todos
    p. 1000-1005
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  • ELIN: a framework to deliver media content in an efficient way based in MPEG standards

     Casademont Serra, Jordi; Perdrix, Ferran; Einhoff, Martin; Paradells Aspas, Jose; Dummer, Georg; Boyer, Anne
    IEEE International Conference on Web Services (ICWS 2005)
    Presentation of work at congresses

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  • ELIN: A MPEG Related News Framework

     Einhoff, Martin; Casademont Serra, Jordi; Perdrix, Ferran; Stefan, Noll
    47th International Symposium ELMAR-2005 focused on "Multimedia Systems and Applications
    p. 139-142
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  • Inteligencia ambiental: una visión sobre sus posibilidades para personas discapacitadas

     Paradells Aspas, Jose; Gomez Montenegro, Carlos; Salvatella, P; Casademont Serra, Jordi
    Congreso Internacional de Domótica, Robótica y Teleasistencia para Todos
    p. 1000-1005
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  • ELIN: a web newspaper using the Universal Multimedia Access concept based in MPEG standards

     Casademont Serra, Jordi; Perdrix, F; Einhoff, M; Paradells Aspas, Jose; Dummer, G; Boyer, A
    The Fifth IASTED International Conference on Visualization, imaging and image processing
    p. 27-32
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  • ELIN: a mpeg based News Delivery Framework

     Dummer, G; Kühl, M; Casademont Serra, Jordi; Perdrix, F; Einhoff, M; Boyer, A
    eChallenges
    Presentation of work at congresses

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  • Demostració dels resultats amb un prototipus del projecte ELIN

     Casademont Serra, Jordi
    Net-atHome2004 - The Premier International Conference & Exhibition covering the Connected Home Markets
    Presentation's date: 2004-11-30
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  • Study of asymmetric traffic influence on IEEE 802.11 WLAN family, enhancement proposals

     López-Aguilera, E; Lopez Aguilera, Maria Elena; Casademont Serra, Jordi; Cotrina Navau, Josep
    13th IEEE Workshop on Local and Metropolitan Area Networks
    p. 45-50
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