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| Instantaneous frequency estimation for AM-FM signals based on WVD |
| Chen Guanghua; Cao Jialin; Wang Jian; Qin Tinggao |
| School of Mech. and Electron. Eng. and Aut., Shanghai Univ.,Shanghai 200072 China |
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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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Received: 14 August 2001
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2003, Vol. 25 
