摘要
提出了一种实现MQAM信号调制方式分类的方法.该方法在通带内利用Hilbert变换提取瞬时包络,然后统计瞬时能量分布向量作为特征向量来实现调制方式分类,避免了搬移到基带过程中带来的频差、相差等计算误差.同时给出了该方法对部分MQAM信号进行仿真识别的结果,在信噪比不低于10 dB的情况下,对4QAM,8QAM,16QAM的正确识别率达到100%,对32QAM,128QAM的识别率在95%以上,对64QAM,256QAM的识别率在90%以上,证明了该方法的有效性.
A modulation recognition algorithm for MQAM signals in the passband is presented. The proposed algorithm extracts the instantaneous envelope of the signals based on the Hilbert transform, and then the distribution vectors of the instantaneous energy are extracted. The algorithm extracting characters in the passband avoids the carrier frequency offset and the phase offset brought about by spectra shifting. The modulation recognition results of a few kinds of MQAM signals are given. The results show that the correct recognition probability of the algorithm is 100% for 4QAM, 8QAM, 16QAM, it is above 95% for 32QAM, 128QAM, and above 90% for 64QAM and 256QAM. The computer simulation verifies the validity of the algorithm.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第5期932-937,共6页
Journal of Xidian University
关键词
正交幅度调制
调制方式识别
通带
瞬时包络
quadrature amplitude modulation
modulation recognition
passbandinstantaneous envelope
