Frequency domain equalization for high data rate multipath channels

Author

Dmochowski, Pawel A. ; McLane, Peter J.

Author_Institution

Dept. of Electr. & Comput. Eng., Queen´´s Univ., Kingston, Ont., Canada

Volume

2

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

534

Abstract

High data rate transmission over multipath channels requires equalizers of long impulse response. In such cases, frequency domain implementation of the block least mean square (BLMS) algorithm offers low complexity growth relative to time domain techniques. The work presented herein is devoted to a study of the fast BLMS (FBLMS) algorithm implemented in the frequency domain using overlap-save sectioning and the fast Fourier transform (FFT). We examine the bit error rate (BER) performance for high data rate quadrature phase shift keying (QPSK) transmission over a multipath channel as well as the computational complexity of the FBLMS equalizer in comparison to the time domain implementation. Finally, we show how normalizing the step size of the FBLMS algorithm according to the power distribution of the input process results in a significant improvement in the equalizer convergence relative to the time domain methods

Keywords

computational complexity; convergence of numerical methods; equalisers; error statistics; fast Fourier transforms; frequency-domain analysis; least mean squares methods; multipath channels; quadrature phase shift keying; BER performance; FBLMS algorithm; FFT; QPSK transmission; bit error rate; computational complexity; convergence; fast Fourier transform; fast block least mean square algorithm; frequency domain equalization; high data rate transmission; multipath channels; overlap-save sectioning; power distribution; quadrature phase shift keying; Bit error rate; Computational complexity; Equalizers; Equations; Fast Fourier transforms; Frequency domain analysis; Least squares approximation; Multipath channels; Quadrature phase shift keying; Signal processing algorithms;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, Computers and signal Processing, 2001. PACRIM. 2001 IEEE Pacific Rim Conference on

Conference_Location

Victoria, BC

Print_ISBN

0-7803-7080-5

Type

conf

DOI

10.1109/PACRIM.2001.953688

Filename

953688