Chapter 6Orthogonal Frequency Division Multiple Access

WiMAX presents a very challenging multiuser communication problem: Many users in the same geographic area requiring high on-demand data rates in a finite bandwidth with low latency. Multiple-access techniques allow users to share the available bandwidth by allotting each user some fraction of the total system resources. Experience has shown that dramatic performance differences are possible between various multiple-access strategies. For example, the lively CDMA versus TDMA debate for cellular voice systems went on for some time in the 1990s. The diverse nature of anticipated WiMAX traffic—VoIP, data transfer, and video streaming—and the challenging aspects of the system deployment—mobility, ...

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