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Due to the fluctuations of wireless channels, the authors can use opportunistic scheduling to exploit multiuser diversity. The conventional opportunistic scheduling is not applied to wireless LANs due to the absence of channel report function. In this paper, they propose a distributed opportunistic scheduling scheme for wireless LAN networks without incurring large overhead of channel probing. A proportional fair scheduling, which is one of the opportunistic scheduling schemes, is used for centralized networks, whereas they design Distributed Proportional Fair Scheduling (DPFS) scheme and medium access control in distributed manner.
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