摘要
认知无线电(Cognitive Radio,CR)是一种智能频谱共享技术,第一用户信号检测是CR应用的前提。根据谱相关分析方法,利用信号非零循环频率处的谱线特征,可将信号从噪声背景中检测出来。为消除基底噪声,采用电子测量中的3σ准则对信号循环谱进行了消噪处理,便于实现检测,仿真论证了该方法在低信噪比下的有效性。
Cognitive Radio is a smart spectral sharing technology, of which the application is based up on detecting presence of primary users. According to spectral correlation analysis, the spectral features of non-zero cyclic frequency is used to detect signals from a background niose. In order to remove floor-noise and for easy detection, 3 σ-rule is applied in electronic measurement to reduce noise in cyclic spectrum. A nd the simulation result proves the validity of the technique in low SNR environment.
出处
《通信技术》
2008年第6期52-54,共3页
Communications Technology
关键词
认知无线电
谱相关
信号检测
3σ准则
cognitive radio
spectral correlation
signal detection
3σ-rule
