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认知无线电能够灵敏感知周围环境的变化,通过频谱感知功能发现频谱空洞,使得认知无线电能够与周围通信环境相适应。在认知无线电网络中,认知用户(次用户)必须连续地监控频谱,检测主用户是否存在。如果主用户存在,次用户必须尽快地退出该频段,从而不影响主用户。在文中采用一种协作机制,即两用户进行协作频谱感知,从而提高主用户的检测率,减少了检测时间,并且得到捷变增益。我们用Matlab给出仿真结果。
Cognitive radio can sensitively sense the changes in the surrounding environment, discover the spectrum holes through the spectrum sensing function, and make the cognitive radio adapt to the surrounding communication environment. In cognitive radio networks, cognitive users (secondary users) must continuously monitor the spectrum to detect the presence of the primary user. If the primary user exists, the secondary user must exit the band as soon as possible without affecting the primary user. In this paper, a collaborative mechanism is adopted, that is, cooperative spectrum sensing is performed by two users so as to improve the detection rate of the primary user, reduce the detection time, and obtain the agile gain. We use Matlab to give the simulation results.