先前研究人员将该“灵敏”方法引入认知无线电设计中，该设计通过捕获最佳可用频谱提高吞吐量以满足用户通信需求。
Researchers previously introduced this "smart" approach in cognitive radio designs, which sought to improve throughput by capturing the best available spectrum to meet user communication requirements.
因认知无线电通过频谱空洞作为控制信道并且控制信道承担传输全部从用户控制信息，所以控制信道的选择处于重要地位。
The selection of control channel in cognitive radio is essential because the control channel has to coordinate all the secondary users via spectrum holes.
本文主要考虑择机频谱接入模式下的认知无线电系统，即认知用户只有在授权用户不活动时才可以占用频谱资源。
In this paper, we consider the situation that the user of the cognitive radio system can only user the spectrum resources when them are not occupied by the authorized user.
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