A new error function for fast phase recovery of QAM signals in CMA blind equalizers

Author

Thakallapalli, Sushrniia Rao ; Nelatury, Sudarshan R. ; Rao, Sathyanarayan S.

Author_Institution

Dept. of Electr. & Comput. Eng.,, Villanova Univ., PA, USA

fYear

2003

fDate

28 Sept.-1 Oct. 2003

Firstpage

70

Lastpage

73

Abstract

A modification to the well-known constant modulus algorithm (CMA) for blind channel equalization is proposed. The conventional CMA has rotational ambiguity and hence cannot achieve carrier phase recovery. It happens because the cost function is made up of the absolute value of the equalizer output and phase information is not used. In this paper, we slightly modify the cost function and provide a different error function that restores the phase of the carrier. Simulations studies are shown for the case of 16-QAM signal constellation.

Keywords

blind equalisers; digital communication; errors; quadrature amplitude modulation; signal processing; 16-QAM signal constellation; QAM signals; blind channel equalization; carrier phase recovery; constant modulus algorithm; cost function; digital communication; error function; fast phase recovery; quadrature amplitude modulation; Adaptive algorithm; Blind equalizers; Cost function; Data communication; Degradation; Digital communication; Intersymbol interference; Nonlinear distortion; Quadrature amplitude modulation; Tracking loops;

fLanguage

English

Publisher

ieee

Conference_Titel

Statistical Signal Processing, 2003 IEEE Workshop on

Print_ISBN

0-7803-7997-7

Type

conf

DOI

10.1109/SSP.2003.1289342

Filename

1289342