中文摘要：

提出一种能够应用于认知无线电网络中的新型协作频谱感知方法——双阈值能量检测,该方法同时利用了次要用户的接收信号能量和局部判决结果两种信息,由判决中心结合次要用户的局部判决结果和接收信号能量,做出最终判决从而确定主要用户存在与否.该方法在通信流量增加不多的情况下能够充分提升检测性能.仿真结果表明当接收信号能量落入延迟判决区间的概率较大时,该算法能够显著地改善认知无线电网络的协作频谱感知能力.

英文摘要：

Cognitive radio has become an effective theory to solve the inefficiency of the spectrum usage,and cooperative spectrum sensing among the secondary users to detect the primary user accurately is broadly studied before. In this paper,we employ a double threshold method in energy detector to perform spectrum sensing,while a fusion center in the cognitive radio network collects the local decisions and observational values of the secondary users,and then makes the final decision to determine whether the primary user is absence or not.Simulation results will show that the spectrum sensing performance in AWGN channels is improved significantly under the proposed scheme as opposed to the conventional method.