基于主用户信号占空比的频谱感知阈值优化  

Spectrum Sensing Threshold optimization based on the Duty Ratio of Primary Signal

作　　者：刘雨函 LIU Yuhan(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学信息科学与工程学院,宁波315211

出　　处：《无线通信技术》2024年第2期49-53,共5页Wireless Communication Technology

摘　　要：传统的频谱感知决策阈值设置仅与虚警概率或检测概率有关,但实际中主用户信号的占空比也会影响阈值。针对该情况,提出了与占空比有关的频谱感知阈值优化函数,并推导了优化后的能量检测法阈值理论表达式。仿真结果表明,与能量检测法在传统阈值下的性能相比,主用户信号存在概率较高时,优化后的阈值具有更高的检测概率;当主用户信号存在概率较低时,优化后的阈值具有更低的虚警概率。The traditional spectrum sensing decision threshold setting is only related to the false alarm probability or detection probability,but in practice,the duty cycle of the primary user signal will also affect the threshold.In view of this situation,a spectrum sensing threshold optimization function related to the duty cycle was proposed,and the theoretical expression of the optimized threshold of the energy detection method was derived.The simulation results show that compared with the traditional threshold,the energy detection method using optimized threshold has better per⁃formance under this threshold,that is,the primary user signal has a higher detection probability in the presence of a large probability,and has a lower false alarm probability in the presence of a small probability of the primary user signal.

关 键 词：频谱感知 决策阈值 检测概率 虚警概率 

分 类 号：TN92[电子电信—通信与信息系统]