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认知无线电技术能够让非授权用户利用已经分配给授权用户的频段。为了不对首要用户的工作造成干扰,认知用户需要对频谱进行不间断的监测来判断首要用户是否存在。因此,频谱的感知是认知无线电技术的关键。协作频谱感知能够充分的利用网络资源,提高网络中的认知用户的检测概率。文中笔者简单地介绍了一种协作频谱感知的方案。仿真结果表明,通过该方法能够提高网络中认知用户的检测概率,提高网络的检测灵敏度。
Cognitive radio technology allows unauthorized users to use the frequency bands already assigned to authorized users. In order not to interfere with the work of the primary user, the cognitive user needs to continuously monitor the spectrum to determine whether the primary user exists. Therefore, the perception of the spectrum is the key to cognitive radio technology. Collaborative spectrum sensing can make full use of network resources and improve the detection probability of cognitive users in the network. In this paper, I briefly introduced a collaborative spectrum sensing program. Simulation results show that this method can improve the detection probability of cognitive users in the network and improve the detection sensitivity of the network.