Abstract
This work addresses the off-grid issue for DOA and frequency estimations when the dictionary based sparse signal recovery concept is adopted. By off-grid, we mean that the true values of signal, angles or frequencies in this case, are not exactly on the sampling grid created by utilizing the discrete dictionary technique. To handle this problem, off-grid is remodelled such that it is represented by an offset matrix that is a sparse matrix. And then, a direct estimate of the offset matrix is developed to compensate the off-grid by utilizing the fact that the offset matrix is a sparse matrix. Finally, by exploring the sparse property of DOAs/frequencies and offset matrix, a joint estimation approach is devised under optimization framework. Numerical studies demonstrate the effectiveness of the proposed approach.
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Acknowledgments
This work was jointly supported by Program for Changjiang Scholars and Innovative Research Team in University under Grant IRT1299, by the special fund of Chongqing Key Laboratory, by Foundation and Advanced research projects of Chongqing Municipal Science and Technology Commission under Grants cstc2014jcyjA40017, cstc2014jcyjA40027 and cstc2015jcyjA40027, by Science and Technology project of Chongqing Municipal Education Commission under Grants KJ1400425 and KJ130504, by the National Natural Science Foundation of China under Grants 61401050 and 61501072, by the Ministry of Education Scientific Research Foundation for Returned Overseas Chinese F201405, and by National High-tech R&D Program (863 Program, SS2015AA011303).
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Author Hongqing Liu has received research grants from Foundation and Advanced research projects of Chongqing Municipal Science and Technology Commission and Ministry of Education Scientific Research Foundation for Returned Overseas Chinese and China NSF. Author Yong Li has received has received research grants from Foundation and Advanced research projects of Chongqing Municipal Science and Technology Commission and China NSF. Author Yi Zhou has received research grant from Science and Technology project of Chongqing Municipal Education Commission.
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Liu, H., Zhao, L., Ding, D. et al. A study on off-grid issue in DOA and frequency estimations. Multidim Syst Sign Process 28, 735–755 (2017). https://doi.org/10.1007/s11045-015-0372-1
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DOI: https://doi.org/10.1007/s11045-015-0372-1