Title :
Multiuser detector performance comparisons in multirate CDMA systems
Author :
Juntti, Markku J.
Author_Institution :
Telecommun. Lab., Oulu Univ., Finland
Abstract :
The performance of the multi-code (MC) access system with one processing gain and the multiple processing gain (MPG) access for asynchronous multirate code-division multiple-access (CDMA) systems are considered. The bit error rates (BER) of the decorrelating, parallel interference canceler (PIC) and groupwise serial interference canceler (GSIC) with either the PIC or decorrelator within the group are compared. The results show that the decorrelating and the GSIC multiuser detectors yield the best performance. For all interference cancellation schemes the BER saturates at high SNRs due to decision errors degrading the multiple-access interference (MAI) estimates. The problem is particularly severe with the PIC detector
Keywords :
cellular radio; code division multiple access; correlation methods; error statistics; interference suppression; land mobile radio; pseudonoise codes; radiofrequency interference; signal detection; spread spectrum communication; BER; DS-CDMA; MAI estimates; asynchronous multirate code-division multiple-access; bit error rates; cellular mobile communication systems; decision errors; decorrelating parallel interference canceler; decorrelator; direct-sequence spread-spectrum modulation; groupwise serial interference canceler; interference cancellation; multi-code access system; multiple processing gain access; multiple-access interference; multirate CDMA systems; multiuser detector; performance; performance comparisons; Bit error rate; Decorrelation; Degradation; Detectors; Interference cancellation; Mobile communication; Multiaccess communication; Multiple access interference; Performance gain; Telecommunications;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686467
