The local minima of fractionally-spaced CMA blind equalizer cost function in the presence of channel noise

Author

Chung, Wonzoo ; LeBlanc, James P.

Author_Institution

Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA

Volume

6

fYear

1998

fDate

12-15 May 1998

Firstpage

3345

Abstract

We study the local minima relocation of the fractionally spaced constant modulus algorithm (FSE-CMA) cost function in the presence of noise. Local minima move in a particular direction as the noise power increases and their number may be eventually reduced. In such cases the performance of FSE-CMA may fail to adequately reduce intersymbol interference (ISI), but achieve an approximated MMSE by reducing its equalizer noise gain under certain constraints. We analyze the mechanism of relocation of the FSE-CMA cost function local minima in terms of the auto-correlation matrix of the sub-channel convolution matrix and its eigenvectors

Keywords

convolution; correlation methods; eigenvalues and eigenfunctions; equalisers; intersymbol interference; matrix algebra; noise; telecommunication channels; FSE-CMA cost function; ISI reduction; approximated MMSE; auto-correlation matrix; channel noise; constant modulus algorithm; eigenvectors; equalizer noise gain; fractionally-spaced CMA blind equalizer; intersymbol interference; local minima relocation; noise power; sub-channel convolution matrix; Autocorrelation; Blind equalizers; Convolution; Cost function; Delay; Interference constraints; Intersymbol interference; Noise measurement; Noise reduction; Performance gain;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on

Conference_Location

Seattle, WA

ISSN

1520-6149

Print_ISBN

0-7803-4428-6

Type

conf

DOI

10.1109/ICASSP.1998.679581

Filename

679581