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Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
ISSN: 1058-6393
ISBN: 0-8186-6405-3
pp: 104-108
R.A. Iltis , Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
L. Mailaender , Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
ABSTRACT
A linear decorrelator detector is proposed for a quasi-synchronous code-division multiple-access (QS-CDMA) cellular system. It is assumed that each of N users has a GPS generated local clock and attempts to transmit in synchrony with the other users in its cell. The base station thus receives N signature waveforms which are approximately synchronized, but with a small timing error due to local oscillator drift and Doppler shifts. The residual timing offset is discretized, and a decorrelator is constructed which attempts to reject the multiuser interference vectors corresponding to the set of possible offsets. Bounds and analytical results for the bit error rate (BER) are obtained for various interferer conditions.<>
INDEX TERMS
code division multiple access, Doppler shift, Doppler effect, signal detection, synchronisation, cellular radio, error statistics, land mobile radio, radiofrequency interference, interference suppression
CITATION

R. Iltis and L. Mailaender, "Linear multiuser detectors for quasi-synchronous CDMA systems," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 104-108.
doi:10.1109/ACSSC.1994.471426
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