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International Journal of Antennas and Propagation
Volume 2017, Article ID 1613638, 13 pages
https://doi.org/10.1155/2017/1613638
Research Article

Experimental Results of Novel DoA Estimation Algorithms for Compact Reconfigurable Antennas

1VTT Technical Research Centre of Finland, Kaitoväylä 1, P.O. Box 1100, 90571 Oulu, Finland
2Department of Electronics and Communications Engineering, Tampere University of Technology, P.O. Box 553, 33101 Tampere, Finland
3Department of Electrical and Computer Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA

Correspondence should be addressed to Henna Paaso; if.ttv@osaap.anneh

Received 9 September 2016; Revised 18 December 2016; Accepted 13 April 2017; Published 24 July 2017

Academic Editor: Sergiy A. Vorobyov

Copyright © 2017 Henna Paaso 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

Reconfigurable antenna systems have gained much attention for potential use in the next generation wireless systems. However, conventional direction-of-arrival (DoA) estimation algorithms for antenna arrays cannot be used directly in reconfigurable antennas due to different design of the antennas. In this paper, we present an adjacent pattern power ratio (APPR) algorithm for two-port composite right/left-handed (CRLH) reconfigurable leaky-wave antennas (LWAs). Additionally, we compare the performances of the APPR algorithm and LWA-based MUSIC algorithms. We study how the computational complexity and the performance of the algorithms depend on number of selected radiation patterns. In addition, we evaluate the performance of the APPR and MUSIC algorithms with numerical simulations as well as with real world indoor measurements having both line-of-sight and non-line-of-sight components. Our performance evaluations show that the DoA estimates are in a considerably good agreement with the real DoAs, especially with the APPR algorithm. In summary, the APPR and MUSIC algorithms for DoA estimation along with the planar and compact LWA layout can be a valuable solution to enhance the performance of the wireless communication in the next generation systems.