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In Cognitive Radio Networks (CRNs), the Cognitive User (CU) dynamically detects the unused spectrum holes released from the Primary User (PU) and use them to transmit the data to improve the spectrum efficiency. However, the requirement of the signal detection technique increases the implementation complexity of the CU. Besides, when the traffic load of the PU is heavy, very few unused spectrum holes are available. Another way to implement the Cognitive Radio (CR) is to let the PU share the spectrum with the CU. In such network, the Primary Source (PS) and the Cognitive Source (CS) can transmit the data concurrently if the Quality-of-Service (QoS) requirements of the primary transmission and the cognitive transmission are both satisfied.
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