6:Opportunistic Communication and Multiuser EECS Diversity Wireless oundations Fundamental Feature of Wireless Channels: Time Variation Channel Strength Time time-varying channel ·multipath fading large-scale channel variations time-varying interference Fundamentals of Wireless Communication,Tse&Viswanath 26: Opportunistic Communication and Multiuser Diversity Fundamentals of Wireless Communication, Tse&Viswanath 2 Fundamental Feature of Wireless Channels: Time Variation • multipath fading • large-scale channel variations • time-varying interference