小波域数字调制信号识别与码速率估计  

Identification of digitally modulated signals and symbol rate estimate in wavelet domain

作　　者：罗华飞 付永庆[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《应用科技》2008年第8期16-19,共4页Applied Science and Technology

摘　　要：根据小波变换后幅值的方差大小识别信号调制类型和不同码元对应采样点相位差的个数识别MPSK信号,及变换后直流电平个数识别MFSK信号,分析MPSK信号经多个尺度小波变换所得系数模的平方和的频谱,及MFSK信号经一次小波变换所得系数模的第2次小波变换幅值的频谱,估计MFSK信号码速率.仿真结果表明,该方法具有较高的精度及抗噪性.Inter-class and intra-class identification between M-ary FSK signals were described in combination with the amplitude and phase characteristics of the signals after using wavelet transform. Meanwhile, the symbol rates of M-ary PSK and M-ary FSK signals were estimated respectively by wavelet transform and chirp Z transform. Simula- tion results indicate that, when both modulation type and modulation parameter are unknown, this algorithm has higher recognition and greater anti-noise ability.

关 键 词：小波变换 数字信号 识别 码速率 

分 类 号：TN919[电子电信—通信与信息系统]