REN Xiao-tian, XU Hui, HUANG Zhi-tao, et al. Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems[J]. Acta Electronica Sinica, 2011, 39(12): 2726-2732.
REN Xiao-tian, XU Hui, HUANG Zhi-tao, et al. Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems[J]. Acta Electronica Sinica, 2011, 39(12): 2726-2732.DOI:
The characteristic of the Code Division Multiple Access (CDMA) signal is analyzed in this paper.And the CDMA system is modeled as the blind source separation pattern
with the received signal is divided into two-spreading-period-length temporal vectors overlapped by one spreading period.The model is applicable for both the synchronous and asynchronous systems.In the new method
the blind source separation algorithm is used to estimate the spreading sequences and information sequences blindly in synchronous and asynchronous systems
no matter the desynchronization time is known or not
and with the users' power are equally or not.At last
mathematical analysis and simulation results demonstrate the validity of the new method.