Bibliographical noteFunding Information:
Manuscript received July 17, 2019; revised October 29, 2019; accepted November 27, 2019. Date of publication December 4, 2019; date of current version March 13, 2020. This work was supported in part by the National Key Research and Development Program of China under Grant 2018YFF0212903 and in part by the National Natural Science Foundation of China under Grants 51707062, 51575167, and 51877075. Recommended for publication by Associate Editor T. Shi. (Corresponding author: Derong Luo.) T. Wu, D. Luo, and X. Wu are with the College of Electrical and Information Engineering, Hunan University, Changsha 410006, China (e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org).
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