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Proportional Fair (PF) scheduling is a widely used technique in recent wireless communication systems. However, scheduling will also bring about a lot of signaling overhead especially in OFDMA based systems which have many sub-channels, assigning these sub-channels to users and feeding back channel quality information to Base Station produce much overhead. In many situations, neglecting the overhead leads to wrong performance conclusions. In this paper, the authors first theoretically optimize the amount of channel quality indication signaling fed back by users in WiMAX system so that the net system throughput can be maximized. Then system level simulation is used to validate the theoretical conclusion.
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