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International Journal of Antennas and Propagation
Volume 2015, Article ID 348636, 9 pages
Research Article

Reduced-Dimension Noncircular-Capon Algorithm for DOA Estimation of Noncircular Signals

1College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2Luoyang Optoelectro Technology Development Center, Luoyang 471000, China
3National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China

Received 2 September 2015; Revised 18 November 2015; Accepted 22 November 2015

Academic Editor: Wei Liu

Copyright © 2015 Weihua Lv 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.


The problem of the direction of arrival (DOA) estimation for the noncircular (NC) signals, which have been widely used in communications, is investigated. A reduced-dimension NC-Capon algorithm is proposed hereby for the DOA estimation of noncircular signals. The proposed algorithm, which only requires one-dimensional search, can avoid the high computational cost within the two-dimensional NC-Capon algorithm. The angle estimation performance of the proposed algorithm is much better than that of the conventional Capon algorithm and very close to that of the two-dimensional NC-Capon algorithm, which has a much higher complexity than the proposed algorithm. Furthermore, the proposed algorithm can be applied to arbitrary arrays and works well without estimating the noncircular phases. The simulation results verify the effectiveness and improvement of the proposed algorithm.