基于动态阈值的可信度加权协作频谱感知

为了提升受阴影衰落等因素影响下的协作频谱感知性能, 采取了一种改进的基于动态阈值和可信度相结合的协作频谱感知方法。该方法利用各认知用户的检测信噪比对检测可信度较低的认知用户进行过滤, 各认知用户根据检测信噪比设定一个适合自身的动态阈值进行能量感知, 融合中心结合各单节点感知结果和分配的传输可信度作出最终判决。仿真结果表明, 在检测信道和传输信道均受到阴影衰落等因素严重影响下, 与单纯的动态阈值协作感知和传统的可信任度协作感知方法相比, 该方法能获得较高的检测概率。

Weighting of credibility cooperative spectrum sensing based on dynamic threshold

In order to improve the performance of cooperative spectrum sensing under factors such as shadow fading, this paper improved a cooperative spectrum sensing method based on the combination of dynamic threshold and credibility would be adopted. Firstly, the method used the cognitive users detection signal to noise ratio to filter the cognitive users that have low detecting reliability. Then, the cognitive user based on the detection signal-to-noise ratio set a dynamic threshold , suitable for itself and its energy detection. Finally, the fusion center in conjunction with the single node sensing results and the allocation of transmission credibility made a final judgment. The simulation results show that the detection channel and the transmission channel are severely affected by factors such as shadow fading, this will be compared with mere dynamic threshold cooperative sensing and traditional weighted collaborative sensing method based on trust, the method can obtain a high detection probability.