Channel blind identification based on cyclostationarity and group delay

  • Authors:

  • S. V. Narasimhan;M. Hazarathaiah;P. V. S. Giridhar

  • Affiliations:

  • Digital Signal Processing Systems Lab., Aerospace Electronics Division, National Aerospace Laboratory, Bangalore, India;Analog Devices (India) Ltd, Bangalore, India and Department of Electronics and Communication Engineering, National Institute of Technology, Karnataka, Surathkal, India;SASKEN, Bangalore, India and Department of Electronics and Communication Engineering, National Institute of Technology, Karnataka, Surathkal, India

  • Venue:
  • Signal Processing
  • Year:
  • 2005

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Abstract

A new approach for channel blind identification based on second order cyclostationary statistics and the group delay has been proposed. In this, two methods are proposed. In both the methods, the correction is applied to the basic phase estimate for both the poles and zeros, in the group delay domain. The basic phase estimate is derived from the spectral correlation density (SCD) of the system output. In the first method, the phase correction is based on magnitude group delay. In the second method, not only the phase correction but also an improved system magnitude estimate of better variance and frequency resolution is derived based on modified magnitude group delay. The results indicate a significant improvement in performance for both the methods. For the first method in the absence of noise, the percentage normalized mean square error is reduced by about 85% over that of the existing non-parametric method. The second method in the presence of noise (SNR = 5 dB), provides a reduction of 74% over the existing non-parametric method and 57% over the existing combined parametric and non-parametric methods.