Exploració per tema "Direction-of-arrival estimation"

Ara es mostren els items 1-15 de 15

    • Blind multi-user combining at the base station for asynchronous CDMA systems 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Text en actes de congrés
      Accés obert
      This paper studies the potential benefits of antenna arrays in cellular CDMA communications and proposes a powerful scheme to undertake the array processing at the base station in CDMA mobile systems. The proposed technique ...

    • Blind multiuser adaptive combining for asynchronous cdma systems 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (1996)
      Text en actes de congrés
      Accés obert
      This paper presents a novel technique to globally estimate and track the direction of arrival (DOA) of different users in an asynchronous CDMA system. The estimates are obtained exploiting the temporal structure of CDMA ...

    • Cross-coupled doa trackers 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A.; Kirlin, R L (1997-10)
      Article
      Accés obert
      A new robust, low complexity algorithm for multiuser tracking is proposed, modifying the two-stage parallel architecture of the estimate-maximize (EM) algorithm. The algorithm copes with spatially colored noise, large ...

    • Fuzzy logic for robust detection in wireless communications 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A.; Bas, J (Institute of Electrical and Electronics Engineers (IEEE), 1997)
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      Accés obert
      This work addresses the problem of spatial reference estimation in mobile scenarios. Novel techniques based on fuzzy logic are introduced to enhance the performance of a tracking system. Specifically, the model-free function ...

    • High performance doa trackers derived from paralell low resolution detectors 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (IEEE, 1996)
      Text en actes de congrés
      Accés obert
      Traditionally, high resolution spectral direction of arrival (DOA) estimation has been associated with algorithms rather than with a processing scheme or architecture. Motivated by previous work on feasible implementations ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 ...

    • Joint direction of arrival and array shape tracking for multiple moving targets 

      Goldberg, Jason Matthew; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1997)
      Text en actes de congrés
      Accés obert
      An algorithm for the joint tracking of source DOAs and sensor positions is presented to address the problem of DOA tracking in the presence sensor motion. Initial maximum likelihood estimates of source DOAs and sensor ...

    • Maximum likelihood time-of-arrival estimation using antenna arrays: Application to global navigation satellite systems 

      Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio (1998)
      Text en actes de congrés
      Accés obert
      The problem of estimating the time-of-arrival (TOA) of a known signal in the presence of interferences and multipath propagation is addressed. This problem, is essential in high precision receivers of the Global Navigation ...

    • ML estimator and hybrid beamformer for multipath and interference mitigation in GNSS receivers 

      Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio; Fernández Prades, Carlos (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-05-31)
      Article
      Accés obert
      This paper addresses the estimation of the code-phase(pseudorange) and the carrier-phase of the direct signal received from a direct-sequence spread-spectrum satellite transmitter. The signal is received by an antenna ...

    • Performance evaluation of interference cancellation techniques using adaptive antennas 

      Antón Haro, Carles; Rodríguez Fonollosa, José Adrián; Rodríguez Fonollosa, Javier (IEEE Vehicular Technology Society, 1998)
      Text en actes de congrés
      Accés obert
      Two array-based algorithms, which jointly exploit or compensate for the spatial and temporal characteristics of the propagation channel, are proposed for intercell interference suppression in UMTS scenarios. The first one ...

    • Robust beamforming for interference rejection in mobile communications 

      Riba Sagarra, Jaume; Goldberg, Jason; Vázquez Grau, Gregorio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-01-01)
      Article
      Accés obert
      The problem of robust beamformer design for mobile communications applications in the presence of moving co-channel sources is addressed. A generalization of the optimum beamformer based on a statistical model accounting ...

    • Robust beamforming for interference rejection in mobile communications 

      Riba Sagarra, Jaume; Goldberg, J; Vázquez Grau, Gregorio (1996)
      Text en actes de congrés
      Accés obert
      The problem of robust beamformer design in the presence of moving sources is considered. A new technique based on a generalization of the constrained minimum variance beamformer is proposed. The method explicitly takes ...

    • Signal selective doa tracking for multiple moving targets 

      Riba Sagarra, Jaume; Goldberg, J; Vázquez Grau, Gregorio; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Text en actes de congrés
      Accés obert
      A new algorithm for signal selective tracking of the directions-of-arrival (DOAs) of multiple moving targets with an array of passive sensors is presented. A new method based on the principles of maximum likelihood estimation ...

    • The Gaussian assumption in second-order estimation problems in digital communications 

      Villares Piera, Nemesio Javier; Vázquez Grau, Gregorio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-10-31)
      Article
      Accés obert
      This paper deals with the goodness of the Gaussian assumption when designing second-order blind estimation methods in the context of digital communications. The low- and high-signal-to-noise ratio (SNR) asymptotic ...

    • The RCAP: a concept for robust beamforming and high resolution DOA tracking 

      Pérez Neira, Ana Isabel; Villarino Villarino, Ramón; Lagunas Hernandez, Miguel A. (IEEE Press, 2000)
      Text en actes de congrés
      Accés obert
      Motivated by the objective of finding a reduced complexity implementation of the EM (estimate and maximize) algorithm, the authors move the concept of alternating projection (AP), reported Ziskind and Wax (1988), to a ...