[1] Chinese Acad Sci, Inst Comp Technol, Beijing 100864, Peoples R China
[2] Harbin Inst Technol, Harbin, Peoples R China
[3] Southeast Univ, Dept Radio Engn, Nanjing, Jiangsu, Peoples R China
[4] Southeast Univ, Signal & Informat Proc Lab, Nanjing, Jiangsu, Peoples R China
[5] Nanjing Univ Posts & Telecommun, Nanjing, Jiangsu, Peoples R China
[6] Univ Washington, Seattle, WA 98195 USA