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传统的能量检测在接收信号为高斯分布下最优,其检测性能最终取决于信噪比。当信噪比下降时,检测性能必然恶化,而且这种恶化是不可避免的和难以改善的。为了改善弱信号的检测性能,本文同时利用了信号的三阶和二阶统计量构造一种双通道信号检测器,在强高斯噪声的背景下,只要弱信号蕴含有足够多的双谱信息,其检测性能将远远超过基于传统的能量检测器的性能。
The traditional energy detection is optimal under the Gaussian distribution of the received signal, and its detection performance ultimately depends on the signal-to-noise ratio. When the signal-to-noise ratio decreases, the detection performance inevitably deteriorates, and the deterioration is inevitable and hard to be improved. In order to improve the detection performance of weak signals, a two-channel signal detector is constructed by using the third-order and second-order statistics of the signal. Under the background of strong Gaussian noise, as long as the weak signal contains enough bispectrum information, Its detection performance will far exceed the performance of traditional energy detectors.