On preconditioned conjugate gradient method for time-varying OFDM channel equalization

Author

Tang, Zijian ; Remis, Rob ; Nordenvaad, Magnus Lundberg

Author_Institution

Fac. EEMCS, Delft Univ. of Technol., Delft, Netherlands

fYear

2012

fDate

25-30 March 2012

Firstpage

3197

Lastpage

3200

Abstract

We consider using the conjugate gradient (CG) algorithm to equalize a time-varying channel in an orthogonal frequency division multiplexing (OFDM) system. Preconditioning technique to accelerate the convergence of the CG algorithm is discussed, where we show that when the Doppler spread becomes higher, the commonly used diagonal preconditioner, despite its simpleness, can perform even worse than without preconditioner. In such a case, a preconditioner with a more complex structure is proposed.

Keywords

Doppler effect; OFDM modulation; conjugate gradient methods; convergence; equalisers; time-varying channels; CG algorithm; Doppler spread; OFDM system; convergence; diagonal preconditioner; orthogonal frequency division multiplexing; preconditioned conjugate gradient method; time-varying OFDM channel equalization; Approximation methods; Complexity theory; Doppler effect; Eigenvalues and eigenfunctions; Hafnium; OFDM; Time-varying channels; OFDM; conjugate gradient; preconditioning; time-varying channel equalization;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on

Conference_Location

Kyoto

ISSN

1520-6149

Print_ISBN

978-1-4673-0045-2

Electronic_ISBN

1520-6149

Type

conf

DOI

10.1109/ICASSP.2012.6288595

Filename

6288595