针对多信号的互相干扰,在时频重叠情况下调制识别困难的问题,提出一种基于高阶累积量的识别方法.由于不同数字调相信号的高阶累积量存在差异;并利用高阶累积量对噪声的不敏感性,从中选取四个特征参数.采用决策树的分类方法,对任意方式组合而成的十种相移键控三信号进行制式识别.实验结果表明,在信噪比不低于0 dB的情况下,可以有效地识别十种时频重叠三信号.与现有的算法对比,该算法在提高信号识别率的基础上,同时也增加了可识别时频重叠信号的个数.%Targeting at mutual disturbance caused by multiple signals and difficult modulation identification un -der the circumstances of time-frequency overlap , an identification method based on high-order cumulant is raised . There exist high-order cumulant divergences of different digital phase-modulated signals , and high-order cumulant is not sensitive for noises .By taking advantages of these two characteristics and selecting four feature parameters , classification method of decision tree is adopted to undertake pattern identification of ten types of phase -shift keying three signals .The experiment results show that , under the circumstance that noise-signal ratio is not less than 0 dB, ten types of time-frequency overlapping three signals can be identified effectively .This algorithm not only improves the signal identification rate , but also increases the numbers of identical time-frequency overlap signals .
展开▼
