Title :
Convergence behaviours of an adaptive step-size constant modulus algorithm for DS-CDMA receivers
Author :
Yuvapoositanon, Peerapol ; Chambers, Jonathon A.
Author_Institution :
Dept. of Electron. Eng., Mahanakorn Univ. of Technol., Bangkok, Thailand
Abstract :
A convergence analysis of the blind adaptive step-size constant modulus algorithm (AS-CMA) for direct-sequence code division multiple access (DS-CDMA) receivers is presented. Analytical results show similar convergence behaviours of the AS-CMA receiver and the adaptive step-size stochastic approximation (AS-SA) receiver. Simulations show that the blind AS-CMA algorithm performs comparably with the non-blind AS-SA in a Markovian type of nonstationary environment. The robustness of the proposed algorithm to different settings of the initial step-size is also shown.
Keywords :
AWGN channels; Markov processes; adaptive signal processing; blind equalisers; code division multiple access; convergence of numerical methods; interference suppression; receivers; DS-CDMA receivers; Markov chain; Markovian type; adaptive step-size stochastic approximation receiver; algorithm robustness; blind adaptive step-size constant modulus algorithm; code division multiple access receivers; convergence analysis; convergence behaviours; direct-sequence CDMA; nonstationary environment; synchronous DS-CDMA system; AWGN; Additive white noise; Algorithm design and analysis; Convergence; Fading; Multiaccess communication; Pulse shaping methods; Signal processing; Signal to noise ratio; Stochastic processes;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1204950
