Exploració per tema "Channel capacity"

Ara es mostren els items 1-20 de 21

    • A mobile controlled algorithm for improving the throughput in a s-aloha ds-cdma system 

      Sallent Roig, Oriol; Agustí Comes, Ramon (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Text en actes de congrés
      Accés obert
      This paper presents a novel adaptive DS-CDMA slotted-ALOHA packet random access scheme with transmitter-based spreading codes for mobiles. It is aimed at improving the throughput and message delay delivery when traffic ...

    • A practical approach for NLOS mitigation in location-aware networks 

      René, Játiva A.; Valdiviezo, Santiago; Espinosa, Andy; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Accés restringit per política de l'editorial
      This paper introduces a practical two-stage approach to achieve the mitigation of the Non Line Of Sight condition by using space-time diversity in timing-based mobile subscribers positioning systems. The first stage performs ...

    • A rate-splitting approach to fading channels with imperfect channel-state information 

      Pastore, Adriano; Koch, Tobias; Rodríguez Fonollosa, Javier (2014-07)
      Article
      Accés restringit per política de l'editorial
      As shown by Médard, the capacity of fading channels with imperfect channel-state information can be lower-bounded by assuming a Gaussian channel input X with power P and by upper-bounding the conditional entropy h(X|Y,H) ...

    • Adaptive schemes for packet data in a ds-cdma environment 

      Sallent Roig, Oriol; Agustí Comes, Ramon (IEEE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC., 1997)
      Text en actes de congrés
      Accés obert
      This paper presents a novel adaptive DS-CDMA slotted-ALOHA packet random access scheme for improving the throughput of the conventional DS-CDMA slotted-ALOHA system. For this purpose a mobile-assisted algorithm is envisaged ...

    • An adaptive ISMA-DS/CDMA MAC protocol for third-generation mobile communications systems 

      Pérez Romero, Jordi; Agustí Comes, Ramon; Sallent Roig, Oriol (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-11)
      Article
      Accés obert
      In this paper, an inhibit sense multiple access–direct sequence/code division multiple access (ISMA-DS/CDMA) medium access control protocol for a packet transmission mobile radio network is presented. The main feature ...

    • Analysis of information and power transfer in wireless communications 

      Caspers, Erick; Ho Yeung, Sai; Sarkar, Tapan K.; Garcia-Lamperez, Alejandro; Salazr, Magdalena; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (2013-06)
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      Accés restringit per política de l'editorial
      An analysis of wireless information compared to power transfer over the same channel, consisting of a transmitting and receiving antenna system, is discussed. This frequency-selective additive-white-Gaussian-noise channel ...

    • Capacity of MIMO Channels: asymptotic evaluation under correlated fading 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier; Pagès Zamora, Alba Maria (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-06-30)
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      Accés obert
      This paper investigates the asymptotic uniform power allocation capacity of frequency nonselective multiple-input multiple-output channels with fading correlation at either the transmitter or the receiver. We consider ...

    • Capacity self-planning in small cell multi-tenant 5G networks 

      Muñoz, Pablo; Sallent Roig, Oriol; Pérez Romero, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      Multi-tenancy allows diverse agents sharing the infrastructure in the 5th generation of mobile networks. Such a feature calls for more automated and faster planning procedures in order to adapt the network capacity to the ...

    • Closed-loop spatial modulation with antenna selection 

      Wang, Jun-ling; Pérez Neira, Ana Isabel; Zhang, Q.; Meiguo, Gao; Xiaoyan, Bian (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      The closed-loop scheme of spatial modulation (SM), which feeds back the selected transmit antenna subsets to the transmitter, is presented to overcome the constraint in SM that the number of transmit antennas has to be a ...

    • Cross-layer schedulling strategy for UMTS downlink enhancement 

      Ferrús Ferré, Ramón Antonio; Alonso Zárate, Luis Gonzaga; Umbert Juliana, Anna; Revés Ballesté, Xavier; Pérez Romero, Jordi; Casadevall Palacio, Fernando José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-06)
      Article
      Accés obert
      This article describes the benefits of including cross-layer information in the scheduling mechanism of a UMTS downlink channel. In particular, the information obtained from the fast power control algorithm is used to ...

    • Generalized perfect codes for symmetric classical-quantum channels 

      Blasco Coll, Andreu; Vázquez Vilar, Gonzalo; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2022-09)
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      Accés obert
      We define a new family of codes for symmetric classical-quantum channels and establish their optimality. To this end, we extend the classical notion of generalized perfect and quasi-perfect codes to channels defined over ...

    • High aspect ratio silicon dioxide pillars 

      Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Servera, F; Marsal, L F; Pallarès Marzal, Josep; Alcubilla González, Ramón (2005-06)
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      Accés restringit per política de l'editorial
      This article describes the benefits of including cross-layer information in the scheduling mechanism of a UMTS downlink channel. In particular, the information obtained from the fast power control algorithm is used to ...

    • Incremental capacity planning in optical transport networks based on periodic performance metrics 

      Morales Alcaide, Fernando; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Incremental planning is performed periodically to decide how a backbone optical network has to be updated to serve the forecast traffic during the next planning period. Based on reliable traffic prediction, new equipment ...

    • On a mutual information and a capacity bound gap of pilot-aided MIMO channels 

      Pastore, Adriano; Joham, Michael; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      For single-user MIMO channels with partial re ceiver CSI, we study the difference between a lower bound and two alternative upper bounds of the mutual information achieved with Gaussian codebooks. These differences are ...

    • Practical algorithms for a family of waterfilling solutions 

      Pérez Palomar, Daniel; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-02-28)
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      Accés obert
      Many engineering problems that can be formulated as constrained optimization problems result in solutions given by a waterfilling structure; the classical example is the capacity-achieving solution for a frequency-selective ...

    • Scalability of broadcast performance in wireless network-on-chip 

      Abadal Cavallé, Sergi; Mestres Sugrañes, Albert; Nemirovsky, Mario; Lee, Heekwan; González Colás, Antonio María; Alarcón Cot, Eduardo José; Cabellos Aparicio, Alberto (2016-12-01)
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      Accés obert
      Networks-on-Chip (NoCs) are currently the paradigm of choice to interconnect the cores of a chip multiprocessor. However, conventional NoCs may not suffice to fulfill the on-chip communication requirements of processors ...

    • Scalability of the channel capacity in graphene-enabled wireless communications to the nanoscale 

      Llatser Martí, Ignacio; Cabellos Aparicio, Alberto; Alarcón Cot, Eduardo José; Jornet Montaña, Josep Miquel; Mestres Sugrañes, Albert; Lee, Heekwan; Solé Pareta, Josep (2015-01-01)
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      Accés obert
      Graphene is a promising material which has been proposed to build graphene plasmonic miniaturized antennas, or graphennas, which show excellent conditions for the propagation of Surface Plasmon Polariton (SPP) waves in the ...

    • Smart antennas: state of the art 

      Boche, Holger; Bourdoux, André; Rodríguez Fonollosa, Javier; Kaiser, Thomas; Molisch, Andreas F.; Utschick, Wolfgang (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-03-31)
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      Accés obert
      Aim of this contribution is to illustrate the state of the art of smart antenna research from several perspectives. The bow is drawn from transmitter issues via channel measurements and modeling, receiver signal processing, ...

    • The effect of broadband matching in simultaneous information and power transfer 

      Ho Yeung, Sai; Kumar Sarkar, Tapan; Salazar Palma, Magdalena; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (2015-03-06)
      Article
      Accés obert
      This paper presents the implementation and the effect of broadband matching in simultaneous information and power transfer. The narrowband characteristic of antennas limited the applications of simultaneous information and ...

    • The IST METRA Project 

      Rodríguez Fonollosa, Javier; Heikkilä, Markku; Kermoal, Jean Philippe; Mestre Pons, Francesc X.; Pagès Zamora, Alba Maria; Pollard, Adam; Schumacher, Laurent; Ylitalo, Juha; Gaspa Maynou, Roger (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-07-31)
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      Accés obert
      This article summarizes the main achievements of the Multi-Element Transmit and Receive Antennas (METRA) Project, an IST research and technological development project carried out between January 2000 and June 2001 by ...