The following are main functionalities required for spectrum decision:• Spectrum Characterization: Based on the observation, the CR users determine not only the characteristics of each available spectrum but also its PU activity model.• Spectrum Selection: The CR user finds the best spectrum band to satisfy user QoS requirements.• Reconfiguration: The CR users reconfigure communication protocol as well as communication hardware and RF front-end according to the radio environment and user QoS requirements.
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