DocumentCode :
379294
Title :
A blind adaptive receiver for interference suppression and multipath reception in long-code DS-CDMA
Author :
Mirbagheri, Arash ; Yoon, Young C.
Author_Institution :
Centre for Wireless Commun., Waterloo Univ., Ont., Canada
Volume :
1
fYear :
2002
fDate :
2002
Firstpage :
242
Lastpage :
246
Abstract :
This paper examines a blind adaptive implementation of a recently proposed linear minimum mean square error (LMMSE) receiver for code-division multiple-access (CDMA) systems with aperiodic spreading sequences in multipath channels. The receiver has been previously shown to perform multiple-access interference (MAI) suppression and multipath diversity combining. The adaptive implementation is based on a fractionally spaced equalizer (FSE) whose taps are updated by the leaky constant modulus algorithm (LCMA) in the cold start and the decision-directed least-mean-square (DD-LMS) algorithm when the channel eye is opened. The LCMA adds a quadratic constraint, defined as the squared norm of the FSE weight vector, to the constant modulus (CM) cost function. Simulation results show that the LCMA with a uniform initialization strategy (all taps equally set to a small non-zero value) acquires all paths associated with the desired user, suppresses MAI, and opens the channel eye for the DD-LMS algorithm to converge to the proximity of the MMSE solution
Keywords :
adaptive equalisers; blind equalisers; code division multiple access; convergence of numerical methods; diversity reception; interference suppression; least mean squares methods; mobile radio; multipath channels; radio receivers; spread spectrum communication; CDMA; DD-LMS algorithm; FSE weight vector; LCMA; LMMSE receiver; MAI suppression; aperiodic spreading sequences; blind adaptive LMMSE receiver; channel eye; code-division multiple access; cold start; convergence; cost function; decision-directed least mean square; fractionally spaced equalizer; leaky constant modulus algorithm; linear minimum mean square error; mobile radio; multipath channels; multipath diversity combining; multiple-access interference; quadratic constraint; squared norm; uniform initialization strategy; Cost function; Diversity reception; Equalizers; Interference constraints; Interference suppression; Multiaccess communication; Multipath channels; Multiple access interference; RAKE receivers; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2002. ICC 2002. IEEE International Conference on
Conference_Location :
New York, NY
Print_ISBN :
0-7803-7400-2
Type :
conf
DOI :
10.1109/ICC.2002.996853
Filename :
996853
Link To Document :
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