Title :
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
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;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on
Print_ISBN :
0-7803-7663-3
DOI :
10.1109/ICASSP.2003.1202555
