Title :
Performances of LMS/NLMS algorithms for CDMA RAKE receivers
Author :
Craciunescu, Razvan ; Halunga, Simona ; Fratu, Octavian
Author_Institution :
Telecommun. Dept., Univ. Politeh. of Bucharest, Bucharest, Romania
Abstract :
This paper presents an innovative technique that identifies the most significant paths of the multipath channels based on the Last Mean Square (LMS) and Normalized Least Mean Squares (NLMS) algorithms applied to RAKE receiver. Simulations have been carried out for a DS-CDMA signal with QPSK modulation, and the performances have been evaluated in terms of the number of taps detected as a function of number of samples processed for different values of the noise variance and different threshold values.
Keywords :
code division multiple access; least mean squares methods; quadrature phase shift keying; radio receivers; spread spectrum communication; CDMA RAKE receivers; DS-CDMA signal; LMS-NLMS algorithms; QPSK modulation; multipath channels; noise variance; normalized least mean square algorithm; threshold values; Channel estimation; Correlators; Detection algorithms; Fading; Least squares approximation; Multipath channels; Noise; DS-CDMA; LMS and NLMS algorithms; RAKE receiver; performance evaluation;
Conference_Titel :
Telecommunication in Modern Satellite Cable and Broadcasting Services (TELSIKS), 2011 10th International Conference on
Conference_Location :
Nis
Print_ISBN :
978-1-4577-2018-5
DOI :
10.1109/TELSKS.2011.6143241
