基于周期性带内检测机制建立了一种优先级队列模型,得到了周期性带内检测机制的性能指标.针对周期性带内检测机制中缺乏对次用户空闲状态时间的利用,提出了一种基于空闲时间的带内主动感知策略(Idle Time based In-band Proactive Sensi...基于周期性带内检测机制建立了一种优先级队列模型,得到了周期性带内检测机制的性能指标.针对周期性带内检测机制中缺乏对次用户空闲状态时间的利用,提出了一种基于空闲时间的带内主动感知策略(Idle Time based In-band Proactive Sensing Strategy,ITIPSS).该策略在执行周期性带内感知的基础上,利用次用户的空闲时间主动感知当前占用的授权频段,以降低检测延时.仿真结果表明,相比周期性带内检测机制,ITIPSS能够有效降低对主用户的检测延时,从而减少次用户对主用户工作的干扰.展开更多
The algorithm of dense spectrum correction has been raised and proved based on the correction of discrete spectrum by fast Fourier transform.The result of simulation shows that such algorithm has advantages of high ac...The algorithm of dense spectrum correction has been raised and proved based on the correction of discrete spectrum by fast Fourier transform.The result of simulation shows that such algorithm has advantages of high accuracy and small amount of calculation.The algorithm has been successfully applied to the analysis of vibration signals from internal combustion engine.To calculate discrete spectrum,fast Fourier transform has been used to calculate the discrete spectrum by the signals acquired by the sensors on the oil pan,and the signal has been extracted from the mixed signals.展开更多
文摘基于周期性带内检测机制建立了一种优先级队列模型,得到了周期性带内检测机制的性能指标.针对周期性带内检测机制中缺乏对次用户空闲状态时间的利用,提出了一种基于空闲时间的带内主动感知策略(Idle Time based In-band Proactive Sensing Strategy,ITIPSS).该策略在执行周期性带内感知的基础上,利用次用户的空闲时间主动感知当前占用的授权频段,以降低检测延时.仿真结果表明,相比周期性带内检测机制,ITIPSS能够有效降低对主用户的检测延时,从而减少次用户对主用户工作的干扰.
基金Project(51176045) supported by the National Natural Science Foundation of China
文摘The algorithm of dense spectrum correction has been raised and proved based on the correction of discrete spectrum by fast Fourier transform.The result of simulation shows that such algorithm has advantages of high accuracy and small amount of calculation.The algorithm has been successfully applied to the analysis of vibration signals from internal combustion engine.To calculate discrete spectrum,fast Fourier transform has been used to calculate the discrete spectrum by the signals acquired by the sensors on the oil pan,and the signal has been extracted from the mixed signals.
