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Journal of Electrical and Computer Engineering
Volume 2014 (2014), Article ID 206146, 7 pages
http://dx.doi.org/10.1155/2014/206146
Research Article

Fast Method for DOA Estimation with Circular and Noncircular Signals Mixed Together

1School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
2School of Communication and Information Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
3School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China

Received 9 August 2014; Revised 15 September 2014; Accepted 16 September 2014; Published 1 October 2014

Academic Editor: Zhihua Zhang

Copyright © 2014 Yaoping Zeng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Most of the existing algorithms to estimate the direction of arrival (DOA) of signals deal with the situation that all signals are circular. However, it is quite often in practical engineering that circular and noncircular signals appear in the same time. To effectively detect DOA of signals in such circumstances, we propose a novel algorithm. Firstly, using received data and its conjugate, we can detect more signals because of the doubled array aperture. Secondly, through unitary transform and multistage Wiener filter (MSWF) technology, we can obtain the noise subspace of array without performing eigendecomposition. Finally, by employing the improved MUSIC algorithm,we can acquire the DOA of the mixed circular and noncircular signals through two-stage search. Simulation results clearly demonstrate the effectiveness of the proposed algorithm.