中文摘要：

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。

英文摘要：

Spectrum sensing technology is the premise and basis of the realization of cognitive radio. As the performance of single node spectrum sensing is not reliable because of wireless fading environment, relay- based cooperative spectrum sensing is discussed. For cooperative spectrum sensing network with single relay node, this paper analyzes the performance of cooperative spectrum sensing with amplify and forward protocol. The closed-form expression of the upper bound of the detection probability is derived in Rayleigh fading channels when the relay node is participating in cooperation. Numerical results show that the relay node participating in cooperation could improve the spectrum sensing performance.