Signal, Image and Video Processing

, Volume 2, Issue 3, pp 261–274

Improved phase estimation based on complete bispectrum and modified group delay

Authors

    • Aerospace Electronics and Systems DivisionNational Aerospace Laboratory
  • Nandini Basumallick
    • Aerospace Electronics and Systems DivisionNational Aerospace Laboratory
  • Ratana Chaitanya
    • Department of Electronics and Communication EngineeringNational Institute of Technology
Original Paper

DOI: 10.1007/s11760-008-0054-7

Cite this article as:
Narasimhan, S.V., Basumallick, N. & Chaitanya, R. SIViP (2008) 2: 261. doi:10.1007/s11760-008-0054-7

Abstract

In this paper, a new method for extracting the system phase from the bispectrum of the system output has been proposed. This is based on the complete bispectral data computed in the frequency domain and modified group delay. The frequency domain bispectrum computation improves the frequency resolution and the modified group delay reduces the variance preserving the frequency resolution. The use of full bispectral data also reduces the variance as it is used for averaging. For the proposed method at a signal to noise ratio of 5dB, the reduction in root mean square error is in the range of 1.5–7 times over the other methods considered.

Keywords

BispectrumModified group delayNon-minimum phase system identificationPhase estimation

Copyright information

© Springer-Verlag London Limited 2008