A fractionally spaced blind equalizer based on linear programming

Author

Luo, Zhi-Quan Tom ; Meng, Mei ; Wong, Kon Max ; Zhang, Jian-Kang

Author_Institution

Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada

Volume

50

Issue

7

fYear

2002

fDate

7/1/2002 12:00:00 AM

Firstpage

1650

Lastpage

1660

Abstract

We formulate the blind fractionally spaced equalization (FSE) problem as one that minimizes a piecewise linear convex function subject to some linear constraints on the equalizer parameters. We show that this formulation achieves both the interference removal and the carrier phase recovery when the input signal possesses a certain quadrature amplitude modulation (QAM) type symmetry. A fast linear programming implementation is presented to solve the convex minimization problem. Computer simulation results indicate the new linear programming-based FSE is able to accurately equalize channels that are known to be not equalizable by T-spaced (or baud rate) blind equalizers and yields superior performance to other blind FSE methods

Keywords

FIR filters; adaptive equalisers; blind equalisers; interference suppression; intersymbol interference; linear programming; minimisation; quadrature amplitude modulation; FIR filter; ISI; QAM; adaptive channel equalization; blind equalizers; carrier phase recovery; computer simulation results; convex minimization problem; equalizer parameters; fractionally spaced blind equalizer; input signal; interference removal; intersymbol interference; linear constraints; linear programming; linear programming-based FSE; piecewise linear convex function; quadrature amplitude modulation; Bandwidth; Blind equalizers; Convergence; Cost function; Finite impulse response filter; Interference constraints; Intersymbol interference; Linear programming; Piecewise linear techniques; Quadrature amplitude modulation;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2002.1011206

Filename

1011206