Title :
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
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;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936964
