Rayleigh信道下双门限协作频谱感知研究

Study on Double Threshold of Cooperative Spectrum Sensing Over Rayleigh Channels

频谱感知是认知无线电系统有效通信的前提,其感知速度和准确性是衡量频谱感知性能的重要指标。现有算法仅考虑理想AWGN信道下双门限协作频谱感知,应用中衰落信道下的频谱感知作深入研究,具有实际意义。为了提高频谱感知在实际应用中的可靠性,将双门限多节点协作方法用于Rayleigh衰落信道仿真检测。仿真实验表明,Rayleigh衰落信道下双门限多节点协作检测方法的可靠性优于高单门限协作检测方法,其检测结果对Rayleigh信道环境下频谱感知系统的设计具有重要参考价值。

Spectrum sensing is a prerequisite of the effective communication in cognitive radio, and its sensing speed and accuracy are important indicators of sensing performance. The existing algorithms studied double threshold of cooperative spectrum sensing only over ideal AWGN channels, but the practical applications in the fading channels was not considered. In order to improve the spectrum sensing reliability under practical environments, the double threshold of muhipoint cooperative method was used to test the spectrum sensing in the Rayleigh channels in this paper. The simulation results show that the double threshold energy detection of cooperative spectrum sensing method is superior to single threshold energy detection of cooperative spectrum sensing method in the Rayleigh channels. It can help to design the spectrum sensing system in the Rayleigh channel environments.