Linear multiuser detection for uplink long-code CDMA systems

Author

Liu, Ping ; Xu, Zhengyuan

Author_Institution

Dept. of Electr. Eng., California Univ., Riverside, CA, USA

Volume

4

fYear

2003

fDate

6-10 April 2003

Abstract

In the uplink of a long-code CDMA system, the base station knows the spreading codes of all serviced users. Given propagation delays, code-decorrelation can be performed to separate users´ inputs in each symbol interval even in a multipath environment. To detect information symbols, we first apply the subspace technique to estimate multipath parameters for the user of interest based on the correlation matrix of whitened data. Then we construct different linear receivers. The statistics of the estimated channel vectors are analyzed and verified by our numerical examples. Performance of the receivers is also studied in simulations.

Keywords

channel estimation; code division multiple access; correlation methods; decorrelation; matrix algebra; mobile radio; multipath channels; multiuser detection; radio receivers; spread spectrum communication; base station; code-decorrelation; correlation matrix; estimated channel vectors; linear multiuser detection; linear receivers; long-code CDMA systems; multipath parameter estimation; performance; spreading codes; subspace technique; uplink; whitened data; Additive white noise; Base stations; Channel estimation; Delay; Gaussian noise; Multiaccess communication; Multipath channels; Multiuser detection; Signal to noise ratio; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-7663-3

Type

conf

DOI

10.1109/ICASSP.2003.1202555

Filename

1202555