Title :
Blind adaptive decision feedback DS-CDMA receivers for frequency selective channels
Author :
De Lamare, Rodngo C. ; Sampiao-Neto, R.
Author_Institution :
CETUC/PUC-RIO, Rio de Janeiro, Brazil
Abstract :
In this work we propose the blind adaptive decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems in frequency selective channels. Closed-form expressions for the design of blind DF DS-CDMA receivers are presented. Blind adaptive stochastic gradient (SG) and recursive least-squares (RLS) type algorithms are developed for use with the constrained minimum variance (CMV) and constrained constant modulus (CCM) receivers along with successive and parallel DF structures. Numerical results show significant performance gains for the proposed blind DF receivers.
Keywords :
automatic repeat request; channel estimation; code division multiple access; interference suppression; least squares approximations; radio receivers; recursive estimation; spread spectrum communication; stochastic processes; blind adaptive decision feedback DS-CDMA receiver; blind adaptive stochastic gradient; channel estimation; constrained constant modulus receiver; constrained minimum variance algorithm; direct sequence code division multiple access; frequency selective channels; interference suppression; recursive least-squares algorithm; Closed-form solution; Direct-sequence code-division multiple access; Feedback; Frequency conversion; Interference constraints; Intersymbol interference; Matched filters; Multiaccess communication; Resonance light scattering; Stochastic processes;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on
Print_ISBN :
0-7803-8523-3
DOI :
10.1109/PIMRC.2004.1373834
