Blind channel estimation based on subspace for multicarrier CDMA

Author

Wu, Jun ; Wang, Yi ; Cheng, K.K.M.

Author_Institution

Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, China

Volume

4

fYear

2001

fDate

2001

Firstpage

2374

Abstract

The channel model and effective signature waveform are analyzed for synchronous multicarrier CDMA (MC-CDMA), and a blind channel estimation algorithm is proposed. We deduce the effective signature waveform in MC-CDMA systems, which is the convolution of signature and unknown channel vector and followed by OFDM demodulation. Thus, the effective signature estimation problem in a subspace-based multiuser detector is actually the channel vector estimation problem. Based on the analysis, a blind channel estimation algorithm is proposed, which provides a close-form signal estimate. Numerical results show that the analysis of effective signature waveform in MC-CDMA is exact and the proposed algorithm is robust in multiuser MC-CDMA system

Keywords

OFDM modulation; code division multiple access; convolution; demodulation; multiuser channels; parameter estimation; signal detection; waveform analysis; OFDM demodulation; blind channel estimation; channel model; channel vector; close-form signal estimate; convolution; effective signature estimation; effective signature waveform; multiuser MC-CDMA; subspace-based multiuser detector; synchronous multicarrier CDMA; Algorithm design and analysis; Blind equalizers; Convolution; Demodulation; Detectors; Multiaccess communication; Multicarrier code division multiple access; OFDM; Robustness; Signal analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd

Conference_Location

Rhodes

ISSN

1090-3038

Print_ISBN

0-7803-6728-6

Type

conf

DOI

10.1109/VETECS.2001.944025

Filename

944025