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Träfflista för sökning "LAR1:cth ;pers:(Viberg Mats 1961);conttype:(refereed)"

Sökning: LAR1:cth > Viberg Mats 1961 > Refereegranskat

  • Resultat 121-130 av 152
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121.
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122.
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123.
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124.
  • Trinh-Hoang, Minh, et al. (författare)
  • AN IMPROVED DOA ESTIMATOR BASED ON PARTIAL RELAXATION APPROACH
  • 2018
  • Ingår i: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. - 1520-6149. ; , s. 3246-3250
  • Konferensbidrag (refereegranskat)abstract
    • In the partial relaxation approach, at each desired direction, the manifold structure of the remaining interfering signals impinging on the sensor array is relaxed, which results in closed form estimates for the interference parameters. By adopting this approach, in this paper, a new estimator based on the unconstrained covariance fitting problem is proposed. To obtain the null-spectra efficiently, an iterative rooting scheme based on the rational function approximation is applied. Simulation results show that the performance of the proposed estimator is superior to the classical and other partial relaxation methods, especially in the case of low number of snapshots, irrespectively of any specific structure of the sensor array while maintaining a reasonable computational cost.
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125.
  • Trinh-Hoang, Minh, et al. (författare)
  • Improved DOA estimators using partial relaxation approach
  • 2018
  • Ingår i: 2017 IEEE 7th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, CAMSAP 2017. ; 2017-December, s. 1-5
  • Konferensbidrag (refereegranskat)abstract
    • © 2017 IEEE. In this paper, the partial relaxation approach is introduced and applied to DOA estimation using spectral search. Unlike existing methods like Capon or MUSIC which can be considered as single source approximations of multi-source estimation criteria, the proposed approach accounts for the existence of multiple sources. At each direction, the manifold structure of interfering signals impinging on the sensor array is relaxed, which results in closed form estimates for the interference parameters. The conventional multidimensional optimization problem reduces, thanks to this relaxation, to a simple spectral search. Following this principle, proposed estimators based on the Deterministic Maximum Likelihood, Weighted Subspace Fitting and Covariance Fitting method are derived. Simulation results show that the performance of the proposed estimators is superior to conventional methods especially in the case of low SNR and low number of snapshots, irrespectively of the special structure of the sensor array.
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126.
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127.
  • Veen, Alle Jan Van Der, et al. (författare)
  • Minimal continuous state-space parametrizations
  • 2015
  • Ingår i: European Signal Processing Conference. - 2219-5491.
  • Konferensbidrag (refereegranskat)abstract
    • We present a minimal continuous parametrization of all multivariate rational contractive transfer functions.In contrast to traditional minimal parametrizations, this parametrization does not contain any structural indices, which makes it very suitable for identification algorithms that use nonlinear optimization to estimate the parameters.
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128.
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129.
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130.
  • Viberg, Mats, 1961, et al. (författare)
  • Array Interpolation Based on Local Polynomial Approximation With Application to DOA Estimation Using Weighted MUSIC
  • 2009
  • Ingår i: Proceedings of ICASSP 2009. ; , s. 2145 - 2148
  • Konferensbidrag (refereegranskat)abstract
    • The problem of direction-of-arrival (DOA) estimation using an array of sensors has received much attention for more than 3 decades. This is due to a rich interest from application areas such as radar, sonar and wireless communication channel characterization. However, high resolution DOA estimation requires an accurate model of the array response. This is usually achieved by measuring the response using sources at known positions (calibration). This paper considers interpolation of the calibration measurements using knowledge of a nominal response model. Standard linear interpolation is compared to an approach based on local polynomial approximation (LPA). We also derive a weighted MUSIC estimator, which is applied using error estimates from the interpolation. Both LPA interpolation and weighted MUSIC are found to improve the performance, but not uniformly in all scenarios.
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  • Resultat 121-130 av 152
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