频谱感知技术是认知无线电系统实现的前提和基础。由于无线衰落环境下单节点频谱感知结果可靠性不高,主要讨论协作频谱感知中的中继协作频谱感知技术。针对单个中继节点的协作频谱感知网络,分析了在AF协议下的频谱感知结果。导出了在瑞利衰落环境下中继节点参与协作感知的检测概率上限的闭合表达式,并进行了数值仿真。数值分析结果表明中继节点参与协作能够提高频谱感知性能。 Spectrum sensing technology is the premise and foundation of the realization of cognitive radio system. Since the single-node spectrum sensing result in wireless fading environment is not reliable enough, we mainly discuss the relay cooperative spectrum sensing technology in cooperative spectrum sensing. Aiming at cooperative spectrum sensing network of a single relay node, spectrum sensing results under AF protocol are analyzed. The closed expression of the upper bound of detection probability of cooperative nodes sensing in the Rayleigh fading environment is derived and numerically simulated. The numerical results show that the relay nodes can improve the spectrum sensing performance by participating in the cooperation.