Direction-of-Arrival Tracking Scheme for DS/CDMA Systems: Direction Lock Loop
S. Min, Dongsun Seo, K.B. Lee, Hyuck Moo Kwon, Young Ho Lee · IEEE Transactions on Wireless Communications · 2004
In this paper, a new direction-of-arrival (DOA) tracking algorithm, direction lock loop (DiLL), is proposed for wireless direct-sequence code-division multiple-access systems. It has a similar concept to the delay lock loop that is used for timing synchronization. It may track the DOA of sources by iterations. Its computational requirements are NK+O(K) for coherent DiLL and 2NK+O(K) for noncoherent DiLL, where N is the number of antenna elements and K is the number of signal sources, which is less than that of the projection approximation subspace tracking with deflation algorithm. The DOA tracking accuracy is demonstrated by analysis and computer simulations.