Browsing by Author "Oliver Riera, Miquel"

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  • Sfairopoulou, Anna; Bellalta, Boris; Macián, Carlos; Oliver Riera, Miquel (Springer Verlag, 2010)
    In multi-rate WLANs, users can suffer transmission rate changes due to the link adaptation mechanism. This results in a variable capacity channel, which is very hostile for VoIP and can cause serious quality of service ...
  • Sfairopoulou, Anna (Universitat Pompeu Fabra, 2008-07-28)
    In IEEE 802.11 WLANs, Link Adaptation mechanisms, which choose the transmission rate of each node, provoke unexpected and random variations on the effective channel capacity. When these changes are towards lower bitrates, ...
  • Sánchez Artigas, Marc (Universitat Pompeu Fabra, 2009-01-12)
    En los últimos años, las redes peer-to-peer (P2P) ha experimentado una fuerte expansión. Estos sustratos se constituyen en forma de redes overlay o de recubrimiento que interconectan usuarios de manera lógica y desacoplada ...
  • Cano Bastidas, Cristina (Universitat Pompeu Fabra, 2011-03-04)
    In the last few years Wireless Sensor Networks (WSNs) have become an interesting field of research mainly due to the challenges and constraints of their design and the broad range of potential applications they can provide. ...
  • Cao Minh, Trang (Universitat Pompeu Fabra, 2014-09-25)
    Through advances in sensor, networking, semiconductor and energy storage technologies, Wireless Sensor Networks (WSNs) are increasingly being deployed in many important applications to enable users to access information ...
  • Bellalta, Boris; Daza, Vanesa; Oliver Riera, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    A queueing model for Multi-rate Multi-user MIMO systems is presented. The model is built upon the assumption that the probability distribution of available destinations among the buffered frames at the Base Station (BS) ...
  • Albó, Laia; Hernández Leo, Davinia; Oliver Riera, Miquel (2016)
    Most MOOCs offer open learning opportunities at Higher Education (HE) level./nHowever, it is still unclear how HE students are taking this type of course. This/nstudy focuses on the profile of HE students participating in ...
  • Albó, Laia; Hernández Leo, Davinia; Oliver Riera, Miquel (CEUR Workshop Proceedings, 2015)
    Blended Massive Open Online Courses (bMOOCs) have arisen as a blended learning strategy that combines the use of MOOC platform-supported activities and video-based content with in-class face-to-face activities in Higher ...
  • Barceló Vicens, Jaume (Universitat Pompeu Fabra, 2009-03-20)
    Aquesta tesi suggereix usar un compte enrere determinista després de les transmissions exitoses en les xarxes d'àrea local sense fils. Com que les estacions que han transmès amb èxit en el seu darrer intent no poden ...
  • Oliveira, Thays A.; Oliver Riera, Miquel; Ramalhinho-Lourenço, Helena (MDPI, 2020)
    The way citizens interact with cities affects overall life quality. Their participation in social decisions is of paramount importance for helping on public decisions that affect governance, regulation and education. This ...
  • Sanabria-Russo, Luis (Universitat Pompeu Fabra, 2016-10-21)
    Using a deterministic backoff after successful transmissions as a distributed contention mechanism for access to the channel can draw benefits from scheduled operation, like the elimination of simultaneous transmissions, ...
  • Platt, Steven; Oliver Riera, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2019)
    While direct allocation of spectrum and evolved medium access protocols provide a base for ubiquitous wireless connectivity, the existing TCP/IP and OSI models were designed for wired networks and do not address open ...
  • Bellalta, Boris (Universitat Pompeu Fabra, 2007-02-23)
    Les xarxes WLANs possibiliten un accés de banda ampla a Internet des <br/>d'un terminal mòbil, essent una possible solució alternativa a les <br/>xarxes cel·lulars. Tanmateix, aquest tipus de tecnologia presenta certes ...
  • Fabri Lima, Marcelus (Universitat Pompeu Fabra, 2020-01-27)
    This thesis focus on internal logistics flows (ILF), which is defined as the flows of materials inside the same business or the same plant. Precisely, this work approaches the ILF of SEAT, a company in the Volkswagen group. ...
  • Liao, Ruizhi (Universitat Pompeu Fabra, 2014-10-06)
    IEEE 802.11 based wireless networks, especially the infrastructure based Wireless Local Area Networks (WLANs) or Wi-Fi networks, are hugely successful, and have become an indispensable part of our life at homes and working ...
  • Oliveira, Thays A.; Gabrich, Yuri B.; Ramalhinho-Lourenço, Helena; Oliver Riera, Miquel; Lourenço, Helena; Cohen, Miri Weiss; Satoru Ochi, Luiz; Gueye, Serigne; Protti, Fábio; Pinto, Alysson A.; Ferreira, Diógenes Viegas Mendes; Coelho, Igor Machado; Coelho, Vitor Nazário (MDPI, 2020)
    Cities are constantly transforming and, consequently, attracting efforts from researchers and opportunities to the industry. New transportation systems are being built in order to meet sustainability and efficiency criteria, ...
  • Sancho Vinuesa, Teresa; Oliver Riera, Miquel; Gisbert Cervera, Mercè (UNED, 2015)
    El fenómeno MOOC, surgido en los Estados Unidos, está despertando un gran interés tanto entre académicos como entre responsables políticos en Europa. Aunque complejo y cambiante, este fenómeno ha creado expectativas tanto ...
  • Oliver Riera, Miquel; Hernández Leo, Davinia; Albó, Laia (2015-11)
    Este nuevo informe realizado por la Cátedra de Telefónica de la Universitat Pompeu Fabra/nrepresenta un segundo análisis del fenómeno MOOC (Massive Open Online Course) desde una/nperspectiva más centrada en la demanda de ...
  • Oliver Riera, Miquel; Hernández Leo, Davinia; Daza, Vanesa; Martín i Badell, Carles; Albó, Laia (2014-01)
    Podemos afirmar que España se ha situado en muy poco tiempo, y de forma sorprendente, en el/ngrupo líder de países que más actividad están generando entorno a los cursos masivos en línea/nabiertos o MOOCs (del inglés Massive ...
  • Bellalta, Boris; Barceló Vicens, Jaume; Staehle, Dirk; Vinel, Alexey; Oliver Riera, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Multi-user spatial multiplexing combined with packet aggregation can significantly increase the performance of Wireless Local Area Networks (WLANs). In this letter, we present and evaluate a simple technique to perform ...