基于循环相关滤波联合循环谱的频谱感知技术

为了实现认知无线电系统的动态频谱管理和接入,认知无线电设备需要不断地对频谱进行感知.针对传统的基于循环谱的感知原理,在低信噪比有限数据情况下其检测性能一般这一不足,提出了一种基于循环相关滤波联合循环谱的感知算法,分析了循环相关滤波器及改进算法.改进算法利用了循环相关滤波和循环谱的双重抑制噪声性能,而计算复杂度只是有限增加.仿真表明,改进算法比传统的基于循环谱的感知方法具有更强的抗噪声性能,适合认知无线电的需要.

Spectrum sensing method based on cyclic correlation filter and spectral correlation

For the implementation of dynamic spect rum manag ement and dy namic spectrum access, co gnitiv e users need to sense the spect rum co ntinuously. The conv entional spect rum sensing method based on cyclostationa ry fea ture detectio n w as reasea rched. In view o f the fact that the conv entiona l method performed insuf ficient ly with fini te data samples in low SN R scena rio s, a nov el sensing appro ach based on cyclic co rrela tio n fil ter joints spect ra l co rrelation was pro posed. The improv ed method took adva ntage of the noi se-rejectio n property of bo th cy clic co rrela tion fil ter and spect ral co rrela tio n analy sis. Simula tion resul ts show tha t the improv ed method has a bet ter performa nce than the co nventio nal one.