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This paper studies average waiting time analysis of opportunistic access in multi-channel cognitive radio networks with a single secondary user and multiple primary users by applying the M/G/1 preemptive priority queueing scheme. By employing convex optimization tool, the secondary user finds the optimal way to distribute the packets to all channels in the system. For sensitive delay network, the authors proposed an algorithm to distribute the secondary user's packets to the only group of channels which satisfy the delay constraint. Simulation are used to validate the results, and simulation results demonstrate a high degree of accuracy for the derived expressions.
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