Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems
Fengbo Lu · Dianzi xuebao · 2011
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.