Title :
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
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;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.679581