应用WVD估计AM-FM信号的瞬时频率
Instantaneous frequency estimation for AM-FM signals based on WVD
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摘要: 该文研究了应用WVD谱峰检测估计AM-FM信号的瞬时频率的方法及其性能。理论分析表明；对线性调频的AM-FM信号，只要其幅度的WVD在频率为零处取得最大值在任意时刻都成立，则基于WVD谱峰检测得到的瞬时频率估计是无偏的，并给出了估计的方差。仿真实验使用高斯包络的线性调频信号表明，利用WVD可以有效地估计AM-FM信号的瞬时频率。
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关键词:
- 瞬时频率; WVD; AM-FM信号
Abstract: In the paper, the method to estimate instantaneous frequency of AM-FM signals using the peak of the WVD and its performances are studied. Analysis results show that the estimation on amplitude time-varying and frequency linear modulating signals will be unbiased, only if the WVD of time-varying amplitude reaches its maximum at frequency zero no matter in which time. The related expected variance is given in the paper. The simulations using signals modulated Gaussian envelope in amplitude and linearly in frequency support this conclusion. -
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