Title :
An efficient blind multiuser detector for DS-CDMA systems
Author :
Li, Zhengyu ; Ye, Getian ; Bi, Guoan ; Yang, Chunhua
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Inst., Singapore
Abstract :
An efficient blind adaptive multiuser detector based on the modified RLS algorithm is proposed for synchronous DS-CDMA systems over a flat fading channel with large spreading sequences. We first properly decompose the optimal weight vector associated with the original code of the desired user into several adaptive weight subvectors. A modified adaptive algorithm based on the conventional RLS algorithm is derived to update the weight subvectors. Simulation results show that the proposed detector achieves better performance than the adaptive detector using conventional RLS algorithm especially for DS-CDMA systems with large processing gains. In addition, it is computationally efficient and robust against the near-far problem
Keywords :
adaptive signal detection; cellular radio; code division multiple access; fading channels; least squares approximations; multiuser channels; personal communication networks; recursive estimation; spread spectrum communication; RLS algorithm; adaptive weight subvectors; efficient blind adaptive multiuser detector; flat fading channel; large processing gain; large spreading sequences; mobile cellular communication systems; modified adaptive algorithm; near-far problem robustness; optimal weight vector decomposition; personal communication systems; simulation results; synchronous DS-CDMA systems; weight subvectors updating; Computational complexity; Detectors; Fading; Least squares approximation; Matched filters; Multiaccess communication; Performance gain; Resonance light scattering; Robustness; Steady-state;
Conference_Titel :
Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-6451-1
DOI :
10.1109/GLOCOM.2000.891651
