Title :
Centralized adaptive MMSE detectors for multirate DS-CDMA in multipath fading channels
Author :
El-Khamy, Mostafa ; Elnoubi, Said ; Alim, O.A.
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
Abstract :
Future mobile systems will support services with different data rates. In this paper, we propose centralized feed-forward feedback architectures for adaptive minimum mean square error (MMSE) detectors for asynchronous multirate direct sequence code division multiple access (DS-CDMA) systems. A multipath Rayleigh fading channel is assumed. The MMSE detector is implemented using the recursive least squares (RLS) algorithm. We compare between the different. proposed architectures and the results are verified using simulations.
Keywords :
Rayleigh channels; adaptive signal detection; cellular radio; code division multiple access; feedback; feedforward; filtering theory; interference suppression; least mean squares methods; least squares approximations; multipath channels; multiuser channels; spread spectrum communication; RLS algorithm; Rayleigh fading; adaptive multirate DS-CDMA; cellular networks; centralized adaptive MMSE detectors; centralized feedforward feedback architectures; data rates; direct sequence code division multiple access; feedforward MMSE filters; fully connected feedback filters; interference suppression; minimum mean square error; mobile systems; multipath fading channels; rate connected feedback filters; recursive least squares algorithm; simulations; Computer architecture; Detectors; Direct-sequence code-division multiple access; Facsimile; Fading; Feedforward systems; Filters; Multiaccess communication; Multimedia systems; Video recording;
Conference_Titel :
Radio Science Conference, 2002. (NRSC 2002). Proceedings of the Nineteenth National
Print_ISBN :
977-5031-72-9
DOI :
10.1109/NRSC.2002.1022645
