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In this paper, the authors develop an opportunistic spectrum scheduling scheme for cognitive radio networks. In the proposed scheme, the channel status (i.e., whether being occupied by primary users) and the instantaneous channel quality (SNR at the secondary receiver) are assumed to vary fast within a frame which consists of a fixed number of slots. At each scheduling epoch, each secondary user will observe the channel conditions, namely the channel status and the channel quality. Based on the queue size and the observed channel conditions, each secondary user will estimate the throughput for each channel over the frame to be scheduled.
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