Now showing items 1-11 of 11

  • Achievable bandwidth estimation for stations in multi-rate IEEE 802.11 WLAN cells 

    García Villegas, Eduard; Viamonte Solé, David; Vidal Ferré, Rafael; Paradells Aspas, Josep (2007-04-16)
    Conference report
    Open Access
    This paper analyzes the effect of multi-rate transmissions in a CSMA wireless LAN environment. Observations in a real testbed showed that bandwidth resources (in Bytes/s) are shared fairly among all stations even though ...
  • Available Admission Capacity Estimations in IEEE 802.11 Access Points 

    García Villegas, Eduard (2008-04-01)
    External research report
    Open Access
    This technical report is intended to provide extended information about the Available Admission Capacity estimation mechanism for IEEE 802.11 cells previously presented. The original formulation has been revised in this ...
  • Channel access unfairness of wireless LAN access methods 

    López Aguilera, M. Elena; Heusse, Martin; Rousseau, Franck; Duda, Andrzej; Casademont Serra, Jordi (Institute of Electrical and Electronics Engineers, 2006-06)
    Conference report
    Open Access
    In this paper, we present an evaluation of chosen wireless LAN access methods involving stations with different bit error rates: n - 1 stations in ideal transmission conditions (BER = 0) and 1 station with a given bit error ...
  • Comportamiento de los usuarios WLAN en el campus UPC de Barcelona 

    Zola, Enrica Valeria; Barceló Arroyo, Francisco; López Ramírez, María (2009-09)
    Conference lecture
    Open Access
    A través del proyecto Education Roaming (eduroam), muchas universidades europeas permiten que sus usuarios puedan desplazarse entre ellas, disponiendo en todo momento de los servicios móviles igual que estuviesen en su ...
  • Detección de transmisores primarios vía cooperación y memoria en Cognitive Radio 

    Bertran Martínez, Antonio (Universitat Politècnica de Catalunya, 2008-12-05)
    Master thesis (pre-Bologna period)
    Open Access
    En este trabajo se pretende analizar una sección de la capa física de Cognitive Radio (de aquí en adelante CR) llamada spectrum leasing, que trata de mejorar la eficiencia compartiendo espectro entre usuarios primarios ...
  • Dual-band Butler matrix for WLAN systems 

    Collado Gómez, Juan Carlos; Grau Besolí, Alfred; Flaviis, Franco de (Institute of Electrical and Electronics Engineers, 2005)
    Conference report
    Open Access
    This paper shows the design of a dual-band Butler matrix aimed to cover the bands corresponding to the standards IEEE802.11a/b, with particular interest in WLAN systems, at the 2.4 GHz and 5 GHz bands. Measurements of the ...
  • Effect of adjacent-channel interference in IEEE 802.11 WLANs 

    García Villegas, Eduard; López Aguilera, M. Elena; Vidal Ferré, Rafael; Paradells Aspas, Josep (2007-06-03)
    Conference report
    Open Access
    Frequency channels are a scarce resource in the ISM bands used by IEEE 802.11 WLANs. Current radio resource management is often limited to a small number of nonoverlapping channels, which leaves only three possible channels ...
  • IPTV via WIFI per la Televisió Local de Vallirana 

    Sellart Ortega, Xavier (Universitat Politècnica de Catalunya, 2008-06-27)
    Master thesis (pre-Bologna period)
    Open Access
    La raó per la qual va sorgir aquest projecte es degut a que amb l’arribada del TDT, les televisions locals hauran de compartir canal. Per això, es van buscar alternatives per continuar tenint un canal independent, i així ...
  • New algorithm for distributed frequency assignments in IEEE 802.11 

    García Villegas, Eduard; Vidal Ferré, Rafael; Paradells Aspas, Josep (2007-02-28)
    Conference report
    Open Access
    The continuous growth of IEEE 802.11 wireless local area networks (WLAN) brings the benefit of a high speed wireless access to packet networks, such as Internet. But it also entails the successive appearance of new ...
  • Outdoor IEEE 802.11g cellular network performance 

    López Aguilera, M. Elena; Casademont Serra, Jordi; Cotrina Navau, Josep (Institute of Electrical and Electronics Engineers, 2004)
    Conference report
    Open Access
    Most studies about the performance of IEEE 802.11 are limited to a single cell environment. Nevertheless, the idea of designing an outdoor cellular network based on WLAN IEEE 802.11 is very attractive, due to the several ...
  • Wireless communication system for land seismic operations: A feasibility study 

    Ramos Gana, Ander (Universitat Politècnica de Catalunya, 2009-02-06)
    Master thesis (pre-Bologna period)
    Open Access
    Wireless data networks have seen rapid growth and deployment in the recent years, replacing traditional wired data networks. WesternGeco is currently using a traditional wired data network in the land seismic operations ...