基于采樣信號(hào)占用度的頻譜感知技術(shù)
張 燁, 龔曉峰
四川大學(xué) 電氣信息學(xué)院,四川 成都 610065
摘要: 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(guò)提取采樣信號(hào)的特征值來(lái)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(guò)蒙特卡羅仿真和實(shí)際檢測(cè)實(shí)驗(yàn),驗(yàn)證了該方法在實(shí)際應(yīng)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(guò)提取采樣信號(hào)的特征值來(lái)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(guò)蒙特卡羅仿真和實(shí)際檢測(cè)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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