Time-variant channel equalization via discrete prolate spheroidal sequences

Author

Zemen, Thomas ; Mecklenbrauker, Christoph E.

Author_Institution

Telecommun. Res. Center Vienna, Austria

Volume

2

fYear

2003

fDate

9-12 Nov. 2003

Firstpage

1288

Abstract

In this work we present an equalization scheme for a multicarrier (MC) code division multiple access (CDMA) communication system that is operated in a frequency-selective time-variant (TV) channel. For block oriented data transmission we are interested to describe the TV channel for the duration of a data block with the smallest amount of parameters possible. Slepian showed that time-limited parts of band-limited sequences span a subspace with strongly reduced dimensionality. The discrete prolate spheroidal (DPS) sequences are the basis of this subspace. We exploit this property by using the Slepian basis expansion model (BEM) to describe a TV channel with a minimum amount of parameters. The mean squared error (MSB) of the Slepian BEM is 30 dB smaller than the MSE of the Fourier BEM for a frequency-flat TV channel. We present simulation results in terms of bit error rate (BER) versus E_b/N₀ for a multiuser MC-CDMA forward link in a frequency-selective TV channel comparing the Fourier BEM and the Slepian BEM for channel equalization.

Keywords

Fourier transforms; bandlimited communication; code division multiple access; equalisers; error statistics; mean square error methods; spread spectrum communication; time-varying channels; BER; CDMA communication system; Fourier Slepian basis expansion model; band-limited sequence; bit error rate; block oriented data transmission; discrete prolate spheroidal sequence; frequency-flat channel; frequency-selective channel; mean squared error; multicarrier code division multiple access; time-variant channel equalization; Bit error rate; Data communication; Discrete Fourier transforms; Frequency conversion; Interference; Multiaccess communication; Multicarrier code division multiple access; OFDM; TV; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2004. Conference Record of the Thirty-Seventh Asilomar Conference on

Print_ISBN

0-7803-8104-1

Type

conf

DOI

10.1109/ACSSC.2003.1292196

Filename

1292196