Manuscript received December 5, 2019; revised January 31, 2020; accepted February 15, 2020. Date of publication February 19, 2020; date of current version July 7, 2021. This work was supported in part by the Major Project of Science and Technology Research Program of Chongqing Education Commission of China (Grant No. KJZD-M201900601), in part by the Ph.D. Project of Chongqing University of Posts and Telecommunications (Grant No. BYJS201802), in part by the Natural Science Foundation of China (Grant Nos. 61702066, 61871209, 61903056 and 61901210), in part by the Graduates Research Innovation Program of Chongqing (Grant No. CYB18168), in part by Chongqing Research Program of Basic Research and Frontier Technology (Grant Nos. cstc2017jcyjAX0256 and cstc2018jcyjAX0154), and in part by the joint Ph.D. program at St.Francis Xavier University funded by State Scholarship Fund of the China Scholarship Council (CSC, No. 201808500138). Recommended for acceptance by Dr. Yingshu Li. (Corresponding author: Laurence T. Yang.) Yinxue Yi is with the School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China with Chongqing Key Laboratory of Mobile Communications Technology, Chongqing 400065, China, and also with the Department of Computer Science, St. Francis Xavier University, Antigonish, NS B2G 2W5, Canada (e-mail: yiyinxue@126.com).
