| 基于多尺度Haar小波变换的MPSK信号码速率盲估计 |
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| 引用本文： | 邓振淼,刘渝. 基于多尺度Haar小波变换的MPSK信号码速率盲估计[J]. 系统工程与电子技术, 2008, 30(1): 36-40 |
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| 作者姓名： | 邓振淼 刘渝 |
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| 作者单位： | 南京航空航天大学信息科学与技术学院,江苏,南京,210016 |
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| 摘 要： | 研究了相位编码信号的码速率估计,提出基于Haar小波变换的多尺度MPSK信号码速率盲估计方法。首先对接收信号作FFT得到信号频谱,对频谱进行平滑之后估计其中心频率,接着由估计出的频率构造相关接收机;然后估计信号的3dB带宽,由估计的带宽作为参考选取三个小波尺度,利用Haar小波的边缘检测特性对相关接收机的输出进行多尺度码元相位跳变点检测,多尺度检测的结果进行叠加;最后对叠加的结果作DFT估计频率得到MPSK信号的码速率估计。仿真表明,高于信噪比门限时本算法可以对码速率进行有效估计。
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| 关 键 词： | 相位编码 码速率 Haar小波 信噪比 |
| 文章编号： | 1001-506X(2008)01-0036-05 |
| 修稿时间： | 2006-11-07 |
Blind symbol rate estimation of MPSK signals based on multi-scale Haar wavelet transform |
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| DENG Zhen-miao,LIU Yu. Blind symbol rate estimation of MPSK signals based on multi-scale Haar wavelet transform[J]. System Engineering and Electronics, 2008, 30(1): 36-40 |
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| Authors: | DENG Zhen-miao LIU Yu |
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| Abstract: | The symbol rate estimation of multi-phase shift keying(MPSK) signals and a method of blind symbol rate estimation of MPSK signals based on multi-scale Haar wavelet transform are presented. The FFT of received signals is applied to smooth the spectrum, then the center frequency is estimated. A correlation receiver can be designed with the estimated frequency. Then the 3 dB bandwidth of signal is estimated to choose three wavelet scales according to signal bandwidth. Detect the jump of phase of the output of the receiver with multi-scale Haar wavelet. The results of the multi-scale analysis are accumulated to improve the estimation performance. Fourier transform is applied to extract periodicity from the resultant WT magnitude. The results show when the SNR is higher than SNR threshold the method can estimate the symbol rate of MPSK effectively. |
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| Keywords: | MPSK symbol rate Haar wavelet SNR |
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