A novel improved MUSIC algorithm by wavelet denoising in spatially correlated noises

In the presence of spatially correlated noises and/or at low SNR, the most popular multiple signal classification (MUSIC) method degrades greatly and even fails to estimate closely spaced signal directions-of-arrival (DOA's). We have proposed an improved DOA estimation method by wavelet denoising in the context of spatially correlated noises. The proposed approach denoises the received signals at each sensor in parallel and the estimates are obtained by applying MUSIC to the denoised data matrix. Simulation results, proving the output SNR enhancement and resolution improvement, are given.

[1]  Thomas Kailath,et al.  ESPRIT-estimation of signal parameters via rotational invariance techniques , 1989, IEEE Trans. Acoust. Speech Signal Process..

[2]  Douglas L. Jones,et al.  A denoising approach to multisensor signal estimation , 2000, IEEE Trans. Signal Process..

[3]  G. V. Anand,et al.  Wavelet denoising for plane wave DOA estimation by MUSIC , 2003, TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region.

[4]  Wang Yongliang,et al.  Spatial wavelet transform preprocessing for direction of arrival estimation , 2002, IEEE Antennas and Propagation Society International Symposium (IEEE Cat. No.02CH37313).

[5]  David L. Donoho,et al.  De-noising by soft-thresholding , 1995, IEEE Trans. Inf. Theory.

[6]  Kevin Buckley,et al.  Spatial-spectrum estimation in a location sector , 1990, IEEE Trans. Acoust. Speech Signal Process..

[7]  R. O. Schmidt,et al.  Multiple emitter location and signal Parameter estimation , 1986 .

[8]  Zhigang Liu,et al.  Wavelet packets-based direction-of-arrival estimation , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[9]  D. Donoho.  Unconditional Bases Are Optimal Bases for Data Compression and for Statistical Estimation , 1993 .

[10]  Jinkuan Wang,et al.  Non-mapping back SB-ESPRIT for coherent signals , 2005, Proceedings. (ICASSP '05). IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005..

[11]  G. Carter.  Coherence and time delay estimation , 1987, Proceedings of the IEEE.

[12]  W.K. Stewart,et al.  Multiresolution-signal direction-of-arrival estimation: a wavelets approach , 2000, IEEE Signal Processing Letters.

[13]  Richard G. Baraniuk,et al.  Improved wavelet denoising via empirical Wiener filtering , 1997, Optics & Photonics.