Secondly, the uncertainty during the process of the spectrum detection is caused by the random of the channel in the Cognitive Radio network.
其次，在认知无线电网络中，由于信道的随机性，造成频谱检测过程中的不确定性。
2
Cognitive radio can effectively improve the utilization of spectrum through dynamic spectrum access technology, in which the channel selection affects directly the performance of the system.
The selection of control channel in cognitive radio is essential because the control channel has to coordinate all the secondary users via spectrum holes.