Original Paper

Signal, Image and Video Processing

, Volume 2, Issue 3, pp 261-274

First online:

Improved phase estimation based on complete bispectrum and modified group delay

  • S. V. NarasimhanAffiliated withAerospace Electronics and Systems Division, National Aerospace Laboratory Email author 
  • , Nandini BasumallickAffiliated withAerospace Electronics and Systems Division, National Aerospace Laboratory
  • , Ratana ChaitanyaAffiliated withDepartment of Electronics and Communication Engineering, National Institute of Technology

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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.


Bispectrum Modified group delay Non-minimum phase system identification Phase estimation