Concurrent blind deconvolution for channel equalization

Author

De Castro, Fernando C C ; De Castro, Maria C F ; Arantes, Dalton S.

Author_Institution

Fac. de Engenharia, Pontificia Univ. Catolica do Rio Grande do Sul, Porto Alegre, RS, Brazil

Volume

2

fYear

2001

fDate

2001

Firstpage

366

Abstract

The constant modulus algorithm (CMA) is recognized as the most widely used algorithm in blind channel equalization practice. However, the CMA cost function exhibits local minima, which often leads to ill-convergence. This paper proposes a concurrent equalizer, in which a least mean square (LMS) equalizer operates cooperatively with a CMA equalizer, controlled through a non-linear link that depends on the system a priory state. Simulation results using M-QAM signalling have shown that the concurrent equalizer presents a much lower sensitivity to local minima than the CMA approach

Keywords

blind equalisers; deconvolution; least mean squares methods; quadrature amplitude modulation; telecommunication channels; telecommunication signalling; CMA cost function; ISI; LMS; M-QAM signalling; blind channel equalization; concurrent blind deconvolution; concurrent equalizer; constant modulus algorithm; ill-convergence; intersymbol interference; least mean square; local minima; nonlinear link; simulation results; Blind equalizers; Communication system control; Convergence; Cost function; Deconvolution; Intersymbol interference; Least squares approximation; Nonlinear control systems; Steady-state; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2001. ICC 2001. IEEE International Conference on

Conference_Location

Helsinki

Print_ISBN

0-7803-7097-1

Type

conf

DOI

10.1109/ICC.2001.936964

Filename

936964