6:Opportunistic Communication and Multiuser ECS Diversity Wireless F oundations Traditional Approach to Wireless System Design Channel Channel Strength Strength Time Time time-varying channel constant channel Compensates for channel fluctuations. Fundamentals of Wireless Communication,Tse&Viswanath 3 6: Opportunistic Communication and Multiuser Diversity Fundamentals of Wireless Communication, Tse&Viswanath 3 Traditional Approach to Wireless System Design Compensates for channel fluctuations