Combining GA and iterative MVDR for DOA estimation in space-time CDMA systems

Authors:
Jhih-Chung Chang
Affiliations:
Department of Information Technology, Ling Tung University, Taichung 408, Taiwan
Venue:
Computers and Electrical Engineering
Year:
2012

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Abstract

This paper deals with direction-of-arrival (DOA) estimation of minimum variance distortionless response (MVDR) approach based on iterative searching technique for space-time code-division multiple access (CDMA) systems. It has been shown that the iterative searching technique is more likely to converge to a local maximum, causing errors in DOA estimation. In conjunction with a genetic algorithm for selecting initial search angle, an efficient approach is presented to achieve the advantages of iterative DOA estimation with fast convergence and less computational load over existing conventional spectral searching MVDR estimator. Simulation results are provided for illustrating the effectiveness of the proposed approach.