摘要
目前使用能量检测方法实现频谱感知的研究一般是通过建模和模拟方式进行。为了通过实验进一步研究能量检测方法,基于USRP无线电测试平台运行能量检测器,在低信噪比环境下,检测无线电信号的检测概率和频谱感知所需时间,测量最小可检测信号集,即测量的存在及其位置。实验数据表明,在类AWGN信道中,当=-25dB时,信号检测达到极限。
Current research studied spectrum sensing using energy detection commonly via modeling and simulations. In this paper, an energy detector base on USRP wireless testbed has been implemented and measured the spectrum sensing time required to achieve the desired detection and false alarm probability for radio signal in low SNR. Moreover, this work measured the minimum detectable signal levels set,that is,detected the existence and position of the experimental data show that in the AWGN-like channel, the limit in signal detection happens at =-25dB.
关键词
频谱感知
认知无线电
能量检测
spectrum sensing
cognitive radios
energy detection
