Asynchronous multi-stage SIC Detector for DS/CDMA systems over multi-path fading channels

Mahmoud Ammar (1) , Thierry Chonavel (1) , Samir Saoudi (1)

1 SC - Département Signal et Communications

A new interference cancellation (IC) scheme is proposed for the uplink of direct-sequence code division multiple access (DS-CDMA) systems communicating over mobile radio channels. The IC detector presented belongs to the subclass of multiuser detectors that employs a multi-stage successive interference cancellation (SIC), and the aim is to show that a low complexity detector can perform well in a mobile radio environment. The new multi-stage SIC scheme includes non-decision directed IC with a modified RAKE combiner to use the diversity in frequency-selective channels, and it works with a finite processing window sliding each iteration to process a new data symbol. The performance is evaluated with known asynchronous delays and channel parameters, in a multipath environment. The results show that the proposed detector is near-far resistant and the loss in performance compared to the single-user bound is small.

Domaines: Traitement du signal et de l'image [eess.SP]

Mahmoud Ammar, Thierry Chonavel, Samir Saoudi. Asynchronous multi-stage SIC Detector for DS/CDMA systems over multi-path fading channels. SPAWC '01 : IEEE Third Signal Processing Workshop on Signal Processing Advances in Wireless Communications, Mar 2001, Taiwan, China. ⟨10.1109/SPAWC.2001.923879⟩. ⟨hal-01864828⟩