Delay Estimation in CDMA Communications Using A FastICA Algorithm
Răzvan Cristescu, Tapani Ristaniemi, J. Joutsensalo, Juha Karhunen · 2000
In this paper, we propose a method for timing acquisition in a code division multiple access (CDMA) communications system. The assumptions made are that the data signals corresponding to different users are statistically independent, and that a minor pilot sequence corresponding to the desired user is available. An independent component analysis (ICA) approach based on a fast fixed-point algorithm is used for simultaneous demodulation of the symbol sequence and finding of synchronization information of the user of interest. No additional pilot signal is used for the timing acquisition. Our semi-blind method performs better than conventional matched filter detector and CMOE receiver. 1. INTRODUCTION Code Division Multiple Access (CDMA) is a data transmission technique for the third generation of mobile phones, based on spread spectrum methods. The CDMA system enables users to transmit over the same frequency band simultaneously. The main advantage of CDMA techniques over the more tra...