基于HHT變換的時頻分析法及其在2FSK系統(tǒng)解調(diào)中的應用
Time-Frequency Analysis Method Based on HHT and Its Application in 2FSK Demodulation Systems
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摘要: 該文用一種非平穩(wěn)信號時頻分析方法(HHT變換)。該方法立足于信號本身特征，著重分析信號的瞬時頻率分布，實現(xiàn)2FSK系統(tǒng)的解調(diào)。通過與傳統(tǒng)解調(diào)方法的比較，論述了該方法在2FSK信號解調(diào)中的合理性和可行性。仿真結(jié)果給出了該方法在解調(diào)過程中的抗噪聲性能，表明了該方法的有效性。Abstract: A time-frequency analysis method, named HHT(Hilbert-Huang Transformation), is applied to the demodulation of 2FSK systems. This method, based on the characteristics of the signal itself, is often used to analyze the instantaneous frequency distributions for non-stationary signals, and in this thesis, it is adopted to realize the demodulation of 2FSK systems. The rationality and feasibility in the process of demodulation is discussed by comparison with traditional methods. Simulation results prove the anti-noise capability and demodulation effectiveness of this new method.
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