Title :
Time-frequency formulation and design of nonstationary Wiener filters
Author :
Kirchauer, Heinrich ; Hlawatsch, Fkanz ; Kozek, Werner
Author_Institution :
INTHFT, Vienna Univ. of Technol., Austria
Abstract :
The nonstationary Wiener filter (WF) is the optimum linear system for estimating a nonstationary signal contaminated by nonstationary noise. We propose a time-frequency (TF) formulation of nonstationary WFs for the practically important case of underspread processes. This TF formulation extends the spectral representation of stationary WFs to the nonstationary case, and it allows an approximate TF design of nonstationary WFs. For underspread processes, the performance obtained with the approximate TF design is close to that of the exact WF
Keywords :
Wiener filters; filtering theory; signal representation; spectral analysis; time-frequency analysis; approximate time-frequency design; nonstationary Wiener filters design; nonstationary noise; nonstationary signal estimation; optimum linear system; performance; spectral representation; time-frequency formulation; underspread processes; Additive noise; Autocorrelation; Eigenvalues and eigenfunctions; Estimation error; Linear systems; Mathematics; Signal design; Signal processing; Time frequency analysis; Wiener filter;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on
Conference_Location :
Detroit, MI
Print_ISBN :
0-7803-2431-5
DOI :
10.1109/ICASSP.1995.479857
