Blind adaptation of decision feedback equalizers based on the constant modulus algorithm

Author

Casas, Raul A. ; Ding, Zhi ; Kennedy, Rodney A. ; Johnson, C. Richard, Jr. ; Malamut, Roberto

Author_Institution

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

Volume

1

fYear

1995

fDate

Oct. 30 1995-Nov. 1 1995

Firstpage

698

Abstract

The constant modulus algorithm (CMA) is a simple and effective blind equalization algorithm that is generally implemented on feedforward linear adaptive equalizers. In this paper, we study the use of CMA on a decision feedback equalizer (CMA-DFE) for blind channel equalization. We analyze the convergence behavior of this highly nonlinear adaptive system. We also find a class of channels for which the decision directed DFE algorithm (DD-DFE) will not converge to the global optimum when initialized at the origin. For some of these channels, the CMA-DFE does not suffer the same ill-convergence.

Keywords

decision feedback equalisers; blind adaptation; blind equalization algorithm; constant modulus algorithm; convergence behavior; decision directed DFE algorithm; decision feedback equalizers; feedforward linear adaptive equalizers; global optimum; highly nonlinear adaptive system; Adaptive equalizers; Adaptive systems; Blind equalizers; Convergence; Decision feedback equalizers; Delay; Feedforward systems; Finite impulse response filter; Intersymbol interference; USA Councils;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 1995. 1995 Conference Record of the Twenty-Ninth Asilomar Conference on

Conference_Location

Pacific Grove, CA, USA

ISSN

1058-6393

Print_ISBN

0-8186-7370-2

Type

conf

DOI

10.1109/ACSSC.1995.540640

Filename

540640