Maximum Likelihood Estimation and Cramer-Rao Lower Bounds for the Multichannel Spectral Evaluation in Hands-Free Communication

Author

Dam, Hai Quang ; Nordholm, Sven ; Dam, Hai Huyen ; Low, Siow Yong

Author_Institution

Res. Inst. of Western Australian Telecommun., Western Australia Univ., Nedlands, WA

fYear

2005

fDate

5-5 Oct. 2005

Firstpage

961

Lastpage

964

Abstract

This paper investigates the short-term power spectral estimation of the source of interest and the interference in noisy environment for hands-free communication. Models of probability density function for the source, interference and noise covariance matrices are proposed for the evaluation of the power spectral parameters. The analysis are performed to obtain the Cramer-Rao bounds for the evaluation and an exact maximum likelihood (ML) estimation is formulated based on the proposed model. Evaluation of an adaptive beamformer with ML estimation shows significant suppression levels for noise and interference whilst maintaining a low source signal distortion

Keywords

cellular radio; covariance matrices; interference suppression; maximum likelihood estimation; radiofrequency interference; Cramer-Rao lower bounds; hands-free communication; interference suppression; maximum likelihood estimation; multichannel spectral evaluation; noise covariance matrices; noise suppression; probability density function; source signal distortion; Acoustic noise; Array signal processing; Australia; Covariance matrix; Interference constraints; Maximum likelihood estimation; Microphone arrays; Noise cancellation; Noise level; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2005 Asia-Pacific Conference on

Conference_Location

Perth, WA

Print_ISBN

0-7803-9132-2

Type

conf

DOI

10.1109/APCC.2005.1554205

Filename

1554205