Reduced-complexity equalization for MC-CDMA systems over time-varying channels

Author

Rugini, Luca ; Banelli, Paolo ; Leus, Geert

Author_Institution

DIEI, Perugia Univ., Italy

Volume

3

fYear

2005

fDate

18-23 March 2005

Abstract

We present a low-complexity equalizer for multicarrier code-division multiple-access (MC-CDMA) downlink systems over time-varying (TV) multipath channels with non-negligible Doppler spread. The equalization algorithm, which is based on a block minimum mean-squared error (MMSE) approach, exploits the band structure of the frequency-domain channel matrix by means of a band LDL^H factorization. The complexity of the proposed block MMSE equalizer is linear in the number of subcarriers, and smaller with respect to a serial MMSE equalizer characterized by a similar performance.

Keywords

Doppler broadening; OFDM modulation; code division multiple access; computational complexity; equalisers; error statistics; frequency-domain analysis; least mean squares methods; matrix decomposition; mobile radio; multipath channels; time-varying channels; Doppler spread; MC-CDMA systems; block MMSE approach; block MMSE equalizer; block minimum mean-squared error approach; complexity; frequency-domain channel matrix; matrix factorization; multicarrier code-division multiple-access; multipath channels; reduced-complexity equalization; serial MMSE equalizer; time-varying channels; wireless mobile communications; Multicarrier code division multiple access; Time-varying channels;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2005. Proceedings. (ICASSP '05). IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-8874-7

Type

conf

DOI

10.1109/ICASSP.2005.1415749

Filename

1415749