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ON INITIALIZATION OF ML DOA COST FUNCTION FOR UCA

By J.-H. Lee and S.-H. Jo

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Abstract:
Maximum likelihood (ML) direction-of-arrival (DOA) estimation is essentially an optimization of multivariable nonlinear cost function. Since the final estimate is highly dependent on the initial estimate, an initialization is critical in nonlinear optimization. Alternating Projection (AP) initialization has been proposed as computationally efficient method for the initialization of the ML DOA cost function. In this paper, we propose a multi-dimensional (M-D) search scheme of uniform exhaustive search and improved exhaustive search. Improved exhaustive search is used to reduce the computational load of uniform exhaustive search. In the improved exhaustive search algorithm, the two-step procedure is applied to reduce the computational load of the uniform exhaustive search initialization scheme. In numerical results, it is shown that the performance of the proposed scheme is better than that of AP initialization.

Citation:
J.-H. Lee and S.-H. Jo, "On Initialization of Ml DOA Cost Function for UCA," Progress In Electromagnetics Research M, Vol. 3, 91-102, 2008.
doi:10.2528/PIERM08052702

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