New estimation algorithm of direction of arrival based on multiuser decorrelator
Zhongfu Ye · Chinese Journal of Radio Science · 2005
The article proposes a new estimation algorithm of directio of arriva l (DOA) over slow multipath fading channels with an antenna array used in the base station of direct sequence code division multiple access (DS/CDMA) system. By exploiting the periodicity and non-orthogonality of spreading sequences, the algorithm performs correlation processing first, decorrelates and then estimates DOAs and amplitudes of all paths of all users simultaneously under the assumption of knowing the time delays. The algorithm neither ignores nor treats the multip ath and multiple access interferences as noise simply, but utilizes decorrelating to eliminate their effects. The theoretical derivation and simulation demonstr ate that the algorithm gives an evident improvement to estimation precision, and realizes a good separation of multipath channels in spatial domain, which makes it possible for subsequent further space time processing.