1. China information consulting and Designing Institute CO., LED
2. Nanjing University of Posts and Telecommunications,Jiangsu Key Laboratory of Wireless Communications,Nanjing,China,210000
3. San Francisco State University,Department of Computer Science,San Francisco,CA,94132
4. College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing,210000