Manuscript received March 23, 2019; revised June 11, 2019; accepted July 21, 2019. Date of publication July 30, 2019; date of current version February 19, 2020. This work was supported in part by the National Key Research and Development Program under Grant 2016YFB0900100, in part by the “111” Project under Grant 17B006, and in part by the Excellent Innovation Youth Program of Changsha of China under Grant KQ1802029. Paper no. TSG-00431-2019. (Corresponding authors: Yong Li; Chun Chen.) W. Li is with the College of Information and Electronic Engineering, Hunan City University, Yiyang 413000, China, and also with the College of Electrical and Information Engineering, Hunan University, Changsha 410082, China (e-mail: liwenguo10@126.com).
