摘要
为了能稳定地识别出接收信号的调制方式,采用分级识别的方案,对软件无线电中用到的六种调制信号(BPSK,QPSK,Π/4DQPSK,MSK,GMSK,TFM)进行分类识别,第一级利用反映包络变化的参数对调制信号集进行粗分类,第二级利用从信号平方谱、瞬时相位平方的双谱中提取出的特征参数分类识别。仿真结果表明,该方案在不需要预知精确载波频率的情况下,可达到较高的识别率。
Based on the theory of hierarchical recognition, the proposed scheme can recognize six modulated signals （BPSK,QPSK, π/4DQPSK,MSK,GMSK,TFM） used in software radio. In the first level, according to the parameter reflecting variation of the envelope, the cursory recognition is progressed. The feature parameters that extracted from the power spectrum of signal-square and the bispectrum of the instantaneous phase-square are used to recognize the modulations in second level. Simulation results show that without predicting carry-wave frequency accurate, the scheme can achieve high recognition ratio.
出处
《信息与电子工程》
2006年第1期63-66,共4页
information and electronic engineering
基金
四川大学青年基金资助项目(200406)
关键词
通信技术
调制识别
双谱估计
特征参数
communication techniques
modulation recognition
bispectrum estimation
characteristic parameter
