For the other algorithms, compared to HMAC, they all decrease significantly with an increase in the number of SU s, and the Max-Power curve and the Greedy curve decrease the most, which is due to the fact that all their related performance metrics exhibit a decreasing trend.
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Mode-Aware Radio Resource Allocation Algorithm in Hybrid Users Based Cognitive Radio Networks.
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However, the HMAC series algorithms have an overall trend of better performance with a larger cell range.