1. School of Computer Science, Chongqing University, Chongqing, China
2. Guangdong Opel Mobile Communications Company Ltd, OPPO, Beijing, China
3. Guangdong Opel Mobile Communications Company Ltd, OPPO, Chengdu, China
4. Department of Communication and Networking, School of Advanced Technology, Xi’an Jiaotong–Liverpool University, Suzhou, China
5. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, China