一种高速LINK22信号类内快速识别方法

摘要

To take full advantage of the limited frequency resource, the modulation system of QAM constellations in annular shape and 8PSK are used in LINK22, so as to achieve and high data rate.Based on the characteristics of high-rate LINK22 signal, and when the high rate LINK22 signal is preliminarily determined, the prior information is utilized sufficiently and a classification method based on the SNR estimation combining R parameter calculation and the mean fourth of the normalized and zero-center instantaneous amplitude estimation is proposed, thus to identify the modulation type of LINK22 signal including 8PSK,16QAM,32QAM and 64QAM.Simulation results indicate that the proposed classification method has fairly good identification effects under low SNR conditions. This method, forits low computation complexity and good real-time performance, is beneficial for engineering implementation.%为了充分利用有限的频率资源，LINK22使用环形星座的QAM及8PSK的调制方式来提高信息传输速率。根据高速LINK22信号的特点，在初步判定为LINK22信号的前提下，充分利用该信号的先验知识，提出了一种信噪比估计联合R参数和零中心归一化瞬时幅度的四阶矩估计对高速LINK22信号的8PSK、16QAM、32QAM及64QAM调制方式进行类内识别的方法。仿真结果表明，该识别方法在低信噪比下仍有良好的识别效果。该算法计算复杂度不高，实时性好，更利于工程实现。