摘要
提出了一种快变瑞利衰落信道下的OFDM信号与单载波信号的类间调制识别新算法。接收到的射频信号经模数变换后,不需要下变频,直接进行处理。利用数字信号的2阶和4阶累量的组合作为分类特征信息,方法简单易行,不需要任何信号和信道噪声的先验知识。仿真结果表明,新算法具有良好的识别性能,在SNR不小于7 dB时能达到90%以上的正确识别率。
A novel modulation identification algorithm based on cumulants to discriminated OFDM signal from the single-carrier modulation signals over a time-varying Rayleigh fading channel is proposed. The received radio-frequency signal after A/D transformation does not perform down conversion and is processed in the radio-frequency condition. By using the combination of second-order and fourth-order cumulants of digital signal as the classification feature, the method is easy to carry out without any preprocessing and any prior knowledge of the signals and channel. Simulation results demonstrate the good performance of the new algorithm and show that an over 90% correct classification rate could be reached when the SNR is above 7dB.
出处
《电子科技》
2007年第2期29-32,共4页
Electronic Science and Technology
关键词
正交频分复用
调制识别
统计矩
累积量
OFDM
modulation identification
statistical moment
cumulant
