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Sökning: swepub > (1990-1994) > Blekinge Tekniska Högskola

  • Resultat 1-10 av 113
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2.
  • Nordebo, Sven, et al. (författare)
  • Spatial Filter Designed Generalized Sidelobe Canceller for Broadband Implementations
  • 1992
  • Ingår i: International Symposium on Signal Processing and Its Applications. - Gold Coast, Australia : IREE Australia. - 909394288 ; , s. 577-580
  • Konferensbidrag (refereegranskat)abstract
    • A novel design procedure for the signal blocking matrix in the broadband generalized sidelobe canceller, is proposed. A 1-dimensional spatial filter is devised in order to prevent the target signal from reaching the cancelling adaptive filters. Simulations and calculations have been performed in order to verify the design
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3.
  • Eriksson, Håkan, et al. (författare)
  • A robust correlation receiver for distance estimation
  • 1994
  • Ingår i: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. - New York : Institute of Electrical and Electronics Engineers (IEEE). - 0885-3010 .- 1525-8955. ; 41:5, s. 596-603
  • Tidskriftsartikel (refereegranskat)abstract
    • Many methods for distance estimation, such as the ultrasonic pulse-echo method, involve the estimation of a time-of-flight (TOF). In this paper, a signal model is developed that, apart from the TOF, accounts for an unknown, linear frequency dependent distortion as well as for additive noise. We derive a TOF estimator for this model based on the criteria of maximum likelihood. The resulting receiver can be seen as an extension or generalization of the well known cross-correlation, or "matched filter", estimator described, e.g., by Nilsson. The novel receiver is found to be more robust against unknown pulse shape distortion than the cross-correlation estimator, giving less biased TOF estimates. Also, bias versus noise sensitivity can be controlled by proper model order selection
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5.
  • Claesson, Ingvar, et al. (författare)
  • Car Performance of an Adaptive Microphone Array
  • 1992
  • Konferensbidrag (refereegranskat)abstract
    • Hands free input of mobile telephones is often almost impossible due to the noise situation in the car and the channel quality. The authors present a method to enhance the quality using an adaptive microphone array. Measurements show an improvement of the input with approximately 10 dB. Tape results are available for subjective evaluation.
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9.
  • Gustavsson, Jan-Olof, et al. (författare)
  • A Generalized Matched Filter
  • 1992
  • Ingår i: International Symposium on Signal Processing and Its Applications. - Gold Coast, Australia : IREE Australia. - 909394288 ; , s. 16-22
  • Konferensbidrag (refereegranskat)abstract
    • Parameter estimation in additive independent identically distributed noise is treated. It is shown that there exists a generalized form of the matched filter which can be used for an arbitrary noise distribution to make e.g. ML-, MAP- or MMSE-estimates of a parameter vector. Simulations are presented to illustrate the performance.
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