| 低信噪比下数字幅度调制的调制进制快速识别 |
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| 引用本文： | 魏小薇,曹志刚.低信噪比下数字幅度调制的调制进制快速识别[J].清华大学学报(自然科学版),2006,46(1):35-38. |
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| 作者姓名： | 魏小薇 曹志刚 |
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| 作者单位： | 清华大学,电子工程系,北京,100084 |
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| 摘 要： | 为了快速自动识别低信噪比下的数字幅度调制进制,提出了一种识别M进制正交幅度调制(M-QAM)和M进制幅度键控(M-A SK)的调制进制的方法。该方法利用优化的缩放尺度对信号进行小波变换,以识别M-QAM和M-A SK信号的调制进制,并进行了仿真。仿真结果表明:仅利用100个观测符号,当信噪比大于或等于-4 dB时,M-QAM信号的正确识别率大于93%;当信噪比大于或等于-10 dB时,M-A SK信号的正确识别率大于90%。这说明该方法在低信噪比下能够快速获得很好的识别性能。
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| 关 键 词： | 信号处理 调制识别 小波变换 |
| 文章编号： | 1000-0054(2006)01-0035-04 |
| 修稿时间： | 2004年12月27 |
Fast identification of the amplitude modulation level at low signal-to-noise ratios |
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| WEI Xiaowei,CAO Zhigang.Fast identification of the amplitude modulation level at low signal-to-noise ratios[J].Journal of Tsinghua University(Science and Technology),2006,46(1):35-38. |
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| Authors: | WEI Xiaowei CAO Zhigang |
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| Abstract: | A method to identify the modulation levels of M-ary Quadrature Amplitude Modulation(M-QAM) and M-ary Amplitude shift keying(M-ASK) was developed to rapidly and automatically identify the modulation levels of digitally modulated signals at low signal-to-noise ratios(SNR).The method uses wavelet transforms with the optimal scale to identify the modulation levels of the M-QAM and M-ASK signals.Simulation results show that when the SNR is not lower than-4 dB,the percentage of correct identification of M-QAM is higher than 93% and when the SNR is not lower than-10 dB,the percentage of correct identification of M-ASK is higher than 90%,using only 100 observed symbols.The results show that the method can rapidly acquire good performance at low SNR. |
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| Keywords: | signal processing digital modulation wavelet transform |
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