[1] Beijing Univ Posts & Telecommun, Natl Engn Lab Mobile Network Technol, Beijing 100876, Peoples R China
[2] Beijing Univ Posts & Telecommun, Key Lab Universal Wireless Commun, Minist Educ, Beijing 100876, Peoples R China
[3] Univ Peshawar, Dept Comp Sci, Peshawar 25120, Pakistan
[4] Shaheed Benazir Bhutto Women Univ, Dept Comp Sci, Peshawar 25000, Pakistan