Mutual coupling effect and compensation in non-uniform arrays for direction-of-arrival estimation

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• 作者：Elie BouDaher ^{eboudahe@villanova.edu}Author Vitae ; Fauzia Ahmad ; ^{fauzia.ahmad@villanova.edu}Author Vitae ; Moeness G. Amin ^{moeness.amin@villanova.edu}Author Vitae ; Ahmad Hoorfar ^{ahmad.hoorfar@villanova.edu}Author Vitae
• 关键词：Direction finding ; Mutual coupling ; Non-uniform arrays ; Direction-of-arrival ; Nested array ; Co-prime arrays
• 刊名：Digital Signal Processing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：61
• 期：Complete
• 页码：3-14
• 全文大小：1263 K
• 卷排序：61

文摘

In this paper, we investigate the effect of mutual coupling on direction-of-arrival (DOA) estimation using non-uniform arrays. We compare and contrast the DOA estimation accuracy in the presence of mutual coupling for three different non-uniform array geometries, namely, minimum redundancy arrays (MRAs), nested arrays, and co-prime arrays, and for two antenna types, namely dipole antennas and microstrip antennas. We demonstrate through numerical simulations that the mutual coupling, if unaccounted for, can, in general, lead to performance degradation, with the MRA faring better against mutual coupling than the other two non-uniform structures for both antenna types. We also propose two methods that can compensate for the detrimental effects of mutual coupling, leading to accurate and reliable DOA estimation. Supporting numerical simulation results are provided which show the effectiveness of the proposed compensation methods.