摘要
提出了一种适用于非协作通信的基于星座图匹配多进制正交调幅(MQAM)信号识别方法。该方法无需信号载频、带宽等先验知识,而是利用高精度测频、全相位快速傅里叶变换(FFT)等方法对信号载频、码速率及初相位进行精确估计,并利用插值滤波消除定时误差,最后将星座图与参考星座图进行匹配,进而得到识别结果。仿真结果表明,当信号Eb/N0>5dB且码元数为1 000时,对信号的识别正确率大于95%。
This paper presents a recognition method of multiple quadrature amplitude modulation（MQAM）signal applied to non-cooperation communication based on constellation matching.This method does not require the prior information about carrier frequency and bandwidth of received signals,only uses methods such as frequency measurement with high accuracy,full-phase fast Fourier transform（FFT）,etc.to accurately estimate the carrier frequency,code ratio and initial phase of signals,and uses interpolation filtering to eliminate the timing error.Finally the constellation is matched with the reference constellation and recognition result is given.The simulation result shows that the correct recognition is more than 95% when Eb/N0 of the signal is more than 5dB and the code symbol number is 1000.
出处
《舰船电子对抗》
2015年第3期39-42,58,共5页
Shipboard Electronic Countermeasure
关键词
多进制正交调幅
调制样式识别
星座图匹配
载频估计
插值滤波
multiple quadrature amplitude modulation
modulation mode recognition
constellation matching
carrier frequency estimation
interpolation filtering
