Exploració per tema "Diversity reception"

Ara es mostren els items 1-20 de 36

    • Advanced signal processing techniques for fixed and mobile satellite communications 

      Henarejos Hernández, Pol; Pérez Neira, Ana Isabel; Mazzali, N.; Mosquera Nartallo, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      Accés restringit per política de l'editorial
      Enabling ultra fast systems has been widely investigated during recent decades. Although polarization has been deployed from the beginning in satellite communications, nowadays it is being exploited to increase the throughput ...

    • Analysis of diversity and equalization techniques applied to M-QAM digital mobile radio systems 

      Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José (Institute of Electrical and Electronics Engineers (IEEE), 1994)
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      Presents an investigation of diversity and/or equalization techniques applied to 4 and 16-QAM TDMA radio systems for rapid fading dispersive channels. In particular, typical urban (TU) environments have been considered. A ...

    • Analysis of prediction diversity TCM-MPSK and postdetection diversity TCM-MDPSK systems on a Rayleigh fading channel 

      Femenias Nadal, Guillem; Agustí Comes, Ramon (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1995-02)
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      Accés obert
      In this paper, the bit error rate (BER) performance of predetection diversity trellis coded multilevel phase shift keying (TCM-MPSK) and postdetection diversity trellis coded multilevel differential phase shift keying ...

    • Blind equalization based on spatial and temporal diversity in block coded modulations 

      Rey Micolau, Francesc; Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1998)
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      Linear block codes can be applied in spatial and/or temporal diversity receivers in order to develop high performance schemes for blind equalization in mobile communications. The proposed technique uses the structure of ...

    • Blind equalization of DS-CDMA and MC-CDMA modulations in time-variant frequency selective channels 

      Rey Micolau, Francesc; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      The paper addresses the blind equalization problem of spread spectrum modulations in the presence of fast time-variant frequency-selective channels. The basic assumption of the paper is that the channel response exhibits ...

    • 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)
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      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 ...

    • Diversity in mobile communications for blind detection of block-coded modulations 

      Vázquez Grau, Gregorio; Rey Micolau, Francesc; Lamarca Orozco, M. Meritxell; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 1999)
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      Spatial, temporal, and frequency diversity structures are analyzed to address the blind equalization problem in the presence of time-variant frequency selective channels. The aim of the paper is to present equalization ...

    • Downlink beamforming for cellular mobile communications 

      Goldberg, J; Rodríguez Fonollosa, Javier (IEEE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC., 1997)
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      A new technique for downlink transmission beamformer design in cellular mobile communications systems using an antenna array at the base station is presented. The method is based on estimation of an underlying spatial ...

    • Enhanced MDIR receiver for space-time dispersive channels 

      Vidal Manzano, José; Cabrera-Bean, Margarita; Agustín de Dios, Adrián; Lagunas Hernandez, Miguel A. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-01-31)
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      Accés obert
      A particular property of the matched desired impulse response receiver is introduced in this paper, namely, the fact that full exploitation of the diversity is obtained with multiple beamformers when the channel is ...

    • Equalization and space diversity techniques in mobile environments: under certain conditions, diversity techniques perform better than equalization techniques in typical mobile radio environments 

      Valdominos Bardají, Antonio; Casadevall Palacio, Fernando José (IEEE., 1994-03)
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      Accés obert
      The development of high-quality digital mobile radio systems has become a major goal in the field of digital communications. The possibility of providing speech and data services free of wire constrictions in different ...

    • Exact representation of antenna system diversity performance from input parameter description 

      Blanch Boris, Sebastián; Romeu Robert, Jordi; Corbella Sanahuja, Ignasi (2003-05-31)
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      A simplc formulation Io compute thc envelope correlation of an antenna divemiry system is dcrired. 11 is shown how to compute the envelope correlation hom the S-parameter descnplian of the antenna system. This approach ...

    • GSLC architecture for sequence detectors using spatial diversity 

      Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel; Vidal Manzano, José (1998)
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      The role of advanced front-ends including spatial diversity, has been considered as an independent part of peak-distortion equalizers, Wiener and Viterbi equalizers. This involves that the optimum processing to remove point ...

    • 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 ...

    • High-SNR analytical performance of spatial multiplexing MIMO systems with CSI 

      García Ordoñez, Luis; Palomar, Daniel P.; Pagès Zamora, Alba Maria; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-11-30)
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      Accés obert
      In this paper, we investigate the average and outage performance of spatial multiplexing multiple-input multiple-output (MIMO) systems with channel state information at both sides of the link. Such systems result, for ...

    • Hybrid turbo FEC/ARQ systems and distributed space-time coding for cooperative transmission 

      Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga (2005-08-24)
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      Accés obert
      Cooperative transmission can be seen as a "virtual" MIMO system, where the multiple transmit antennas are in fact implemented distributed by the antennas both at the source and the relay terminal. Depending on the system ...

    • Introduction of MPR information for enhanced multi-cluster scheduling in LTE-A uplink 

      Lema Rosas, María Ángel; García Lozano, Mario; Ruiz Boqué, Sílvia; González González, David (2013)
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      Accés restringit per política de l'editorial
      Against previous Long Term Evolution (LTE) re-leases, LTE-Advanced (LTE-A) allows the use of non-contiguous resource allocation in the uplink (UL). This feature leads to an increase in spectral efficiency thanks to link ...

    • Joint antenna diversity and combined DFE/decoding of trellis coded modulation on frequency-selective fading mobile radio channels 

      Gelonch Bosch, Antonio José (Institute of Electrical and Electronics Engineers (IEEE), 1993)
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      A Monte Carlo simulation study of a combined FDMA/TDMA slow frequency-hopping trellis coded adaptive receiver for multipath Rayleigh fading channels is presented. The receiver structure, first proposed by Proakis (1989) ...

    • Joint array combining and MLSE for single-user receivers in multipath Gaussian multiuser channels 

      Lagunas Hernandez, Miguel A.; Vidal Manzano, José; Pérez Neira, Ana Isabel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-09-30)
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      Accés obert
      The well-known structure of an array combiner along with a maximum likelihood sequence estimator (MLSE) receiver is the basis for the derivation of a space-time processor presenting good properties in terms of co-channel ...

    • Joint beamforming and Viterbi equalizer in wireless communications 

      Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 1997)
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      The presence of a sequence detector in the baseline architecture for base stations for mobile communications has become a standard. Also the use of coding allows the baseband detector to work at very low signal to noise ...

    • Multichannel receivers from ofdm and tdma in mobile communications 

      Lamarca Orozco, M. Meritxell; Vázquez Grau, Gregorio (IEEE IEEE, 1997)
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      This paper addresses the use of multichannel receivers for blind equalization in TDMA under frequency selective channels and OFDM systems in frequency flat fading channels. A new criteria is proposed for blind equalization ...