[Zhou, Di;Feng, Feng] Tianjin Univ, Sch Microelect, Tianjin, Peoples R China.^[Zhang, Jianan] Southeast Univ, Sch Informat Sci & Engn, Nanjing, Peoples R China.^[Jin, Jing] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.^[Zhang, Wei] Beijing Univ Posts & Telecommun, Sch Elect Engn, Beijing, Peoples R China.^[Yan, Shuxia] Tiangong Univ, Sch Elect & Elect Engn, Tianjin, Peoples R China.^[Zhang, Qi-Jun] Carleton Univ, Dept Elect, Ottawa, ON, Canada.