Subspace adaptive detection for asynchronous multiuser CDMA with frequency domain channel response and delay estimation

Document Type

Conference Proceeding

Publication Date

1-1-2001

Abstract

Channel estimation, particularly delay estimation in asynchronous CDMA channel, is essential for most receivers. The correlated time domain data sequence will become asymptotically uncorrelated in frequency domain. By taking Discrete Fourier Transform (DFT) of the received signals, we can take advantage of this asymptotical property to simplify the estimation algorithm. The proposed scheme can jointly estimate the path delay and the complex channel response with lower computational complexity. Furthermore, having such estimates, it is possible to use adaptive subspace MOE detector, previously implemented in synchronous channels, for asynchronous multiuser CDMA. Using simulation, it was shown that this scheme can provide comparable performance to that obtained with Wiener filter.

Identifier

0034853909 (Scopus)

Publication Title

ICASSP IEEE International Conference on Acoustics Speech and Signal Processing Proceedings

ISSN

15206149

First Page

2277

Last Page

2280

Volume

4

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