A Novel DS-CDMA Direction of Arrival Estimator for Frequency- Selective Fading Channel with Correlated Multipath by using Beamforming Filter

In this paper a new method for estimating the direction of arrival of Asynchronous DSCDMA signals in fading channel with multipath is proposed. In the proposed method first for removing effects of undesired paths we apply the coherent signals of the undesired paths perpendicularly to the under process signal, next, signal is passed through a filter bank and then using the beam space idea. Since beam forming filters are used, effects from other users on the desired users signal is also decreased which in turn increase the efficiency of the algorithm and search area decrease almost to one tenth. In this algorithm it is not required to search all angles, does not require information criteria for estimating the number of sources and number of users can exceed the number of antenna arrays contrary to many of the conventional methods. Simulation results are illustrated to confirm the efficiency of the method.

کلیدواژه ها:

Direction of arrival estimation ، orthogonal projection ، beam forming ، frequencyselective fading channel.