Blind Estimation of DOA and Direct Sequence for CDMA Signals in Time-Varying Channel
Liao Gui-sheng · Dianzi xuebao · 2002
Based on the signature sequence of users,a new method is proposed to provide the simultaneous estimation of both the direction of arrival (DOA) and the direct sequence for nonstationary code division multiple access (CDMA) signals in this paper. First,a new cost function is defined using the signature sequence of users; then the optimum weight vector is obtained by searching the cost function; finally trace of the weight vector is completed by the improved recursive algorithm to fit the nonstationarity of signals caused by the time-varying channel.The robust method is suitable for both stationary and nonstationary signals,and the effectiveness of the method is showed by the simulation results.