基于采样信号占用度的频谱感知技术
张 烨, 龚晓峰
四川大学 电气信息学院,四川 成都 610065
摘要: 针对现有三种频谱感知技术的局限性,提出了一种基于采样信号占用度的频谱感知方法,通过提取采样信号的特征值来计算采样时段内的频谱占用度,并以此判决信号是否存在,实现了较低信噪比下的频谱感知。通过蒙特卡罗仿真和实际检测实验,验证了该方法在实际应用中的有效性。
中圖分類號(hào): TN911
文獻(xiàn)標(biāo)識(shí)碼: A
文章編號(hào): 0258-7998(2010)12-0111-03
文獻(xiàn)標(biāo)識(shí)碼: A
文章編號(hào): 0258-7998(2010)12-0111-03
Spectrum sensing based on sampled signal occupancy
ZHANG Ye, GONG Xiao Feng
School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China
Abstract: Aiming at the limitations of existing spectrum sensing technologies, we propose a new method based on sampled signal occupancy. This method uses digital characteristics of signal to calculate spectrum occupancy within sampling time, and then detects the existence of signal according to the occupancy. Therefore, it can work on a low SNR. Monte Carlo simulation and real experiment results confirm its effectiveness in practical situation.
Key words : cognitive radio; spectrum sensing; signal characteristics; sampled signal occupancy
針對(duì)現(xiàn)有三種頻譜感知技術(shù)的局限性,提出了一種基于采樣信號(hào)占用度的頻譜感知方法,通過提取采樣信號(hào)的特征值來計(jì)算采樣時(shí)段內(nèi)的頻譜占用度,并以此判決信號(hào)是否存在,實(shí)現(xiàn)了較低信噪比下的頻譜感知。通過蒙特卡羅仿真和實(shí)際檢測實(shí)驗(yàn),驗(yàn)證了該方法在實(shí)際應(yīng)用中的有效性。
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