Abstract
We propose a novel opportunistic access scheme for cognitive radios that considers the channel gain as well as the predicted idle channel probability. In contrast to previous works where a cognitive user vacates a channel only when that channel becomes busy, our scheme requires the cognitive user to switch to the channel with the next highest idle probability if the current channel's gain is below a certain threshold. We derive the threshold values that maximize the long term throughput for various transition probabilities and compare our throughput results to those obtained using a non-channel adaptive scheme. We also provide simulation results that validate our analytical results.
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