1. Research and Development, CU Coding, Hong Kong, New Territories, Hong Kong, Hong Kong, (e-mail: shakeelsalamat@gmail.com)
2. The Department of Information Engineering, Chinese University of Hong Kong, 26451 New Territories, Shatin, Hong Kong, (e-mail: soung@ie.cuhk.edu.hk)
3. INSITUTE OF COMMUNICATIONS AND NAVIGATION, GERMAN AEROSPACE CENTER, Munich, Munich, Germany, (e-mail: gianluigi.liva@dlr.de)
4. Faculty of Information Engineering, Shenzhen University, 47890 Shenzhen, Guangdong, China, 518060 (e-mail: ttwang@ie.cuhk.edu.hk)