Abstract
AbstractIn this paper, an adaptive multiuser Orthogonal Frequency Division Multiple Access (OFDMA) system in the downlink is investigated which serves two sets of users differing in their priority regarding channel access. A Weighted Proportional Fair Scheduling (WPFS) approach is applied using instantaneous Channel Quality Information (CQI) and user priorities to allocate the different subcarriers to the different users. These CQI values are assumed to be imperfect due to time delays and estimation errors. The joint impact of imperfect CQI and user priority on the performance of the system is investigated analytically and assessed by numerical results. It appears that serving users with different priorities comes at the expense of reduced system data rate and less robustness against imperfect CQI.KeywordsOrthogonal Frequency Division Multiple AccessPriority UserOrthogonal Frequency Division Multiple Access SystemJoint ImpactProportional Fair ScheduleThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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