航空信道下一种基于循环谱能量的频谱检测方法

A spectrum detection based on cyclic spectrum energy in aviation channel

针对航空衰落信道下多普勒频移对基于循环平稳特性的频谱检测性能下降问题,提出了一种基于平滑的循环谱能量的频谱检测方法.该方法通过对接收信号循环谱的估计,计算出频率为零时循环频率正半轴与负半轴循环谱最大值对应的循环频率值,获取该循环频率截面能量并平滑平均作为检验统计量进行频谱检测.仿真结果表明,该方法可有效改善因多普勒频移引起的信号循环谱频谱偏移、频谱泄露以及循环谱峰值降低等问题,提高了频谱检测概率.

Aiming at the problem of declining spectrum detection performance based on cyclostationary character for Doppler frequency shift in aviation fading channels, a spectrum detection method based on smoothed circular spectrum energy is proposed. The method through a cycle of received signal spectrum estimation, calculate the frequency to zero and negative half cycle frequency is half shaft axis cyclic spectrum corresponding to the maximum cyclic frequency, to get the cyclic frequency section average stationary energy as test statistics test spectrum. Simulation results show that this method can improve the spectrum detection probability, such as spectrum deviation of signal spectrum, spectrum leakage and peak circulation spectrum caused by Doppler frequency shift.