【作者】 赵知劲； 张伟卫； 徐世宇；

【Author】 Zhao Zhi jin~(1,2) Zhang Wei wei~1 Xu Shi yu~1 (1 Telecommunication School,Hangzhou Dianzi University,Hangzhou 310018,China;2 State key lab of information control technology in communication system of No.36 Research Institute,China Electronic Technology Corporation,Jiaxing 314001,China)

【机构】 杭州电子科技大学通信工程学院； 中国电子集团第36研究所通信系统信息控制技术国家级重点实验室；

【摘要】 频谱感知是认知无线电的关键技术之一。针对循环平稳特性检测法计算复杂度高和检测门限难以确定,本文提出只对循环相关谱特定的峰值点进行检测的循环相关谱检测法和循环相关谱系数检测法,推导得到了这两种方法检测统计量的概率密度函数和检测门限。仿真结果表明,循环相关谱检测法的检测性能优于循环相关谱系数检测法,但循环相关谱检测法的性能受噪声功率估计误差影响大,而循环相关谱系数检测法不需要已知噪声功率,实用性更强。更多还原

【Abstract】 Spectrum sensing plays a key role in cognitive radio.Because the computation complexity of traditional cyclostationarity feature detector is high and the thresholds are hard to set, this paper proposes two methods which only detect on some peak points of cycle coherence spectrum,named a detection method based on cycle coherent spectrum and a detection method based on cycle coherent spectrum coefficience.And then the probability density functions of their detection statistics and thresholds are deduced.Simulation results show that the performance of the method based on cycle coherent spectrum is better than that of the method based on cycle coherent spectrum coefficient,but it is affected by the noise power greatly.The later doesn’t need the prior information of noise power and is suitable for practical application.更多还原