[1] Chinese Univ Hong Kong, Dept Informat Engn, Shatin, Hong Kong, Peoples R China
[2] Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Kowloon, Hong Kong, Peoples R China
[3] Rutgers State Univ, Dept Elect & Comp Engn, WINLAB, Piscataway, NJ USA
[4] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY USA
[5] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA
[6] Univ Illinois, Dept Elect & Comp Engn, CSL, Urbana, IL 61801 USA