A Frequency Offset Estimation and Tracking Method of Phase Modulation Signal Based on Nonlinear Transformation
A technology of nonlinear transformation and frequency offset estimation, which is applied in carrier adjustment, modulated carrier system, digital transmission system, etc. It can solve the problems of poor capture accuracy and low signal-to-noise ratio of FFT spectrum analysis, and achieve frequency offset estimation and tracking accuracy. High, improve the signal-to-noise ratio, the effect of obvious peak
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[0033] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0034] The principle block diagram of the present invention is as figure 1 As shown, the frequency offset estimation method is composed of modules such as digital down-conversion, low-pass filter, nonlinear transformation, FFT spectrum analysis, NCO compensation and closed-loop, and carrier discrimination. Where A is the amplitude of the input signal, I and Q are the modulated baseband data of the input signal, A0 is the amplitude of two quadrature signals generated locally, ω i and ω 0 are the angular frequencies of the input signal and the local carrier, respectively.
[0035] A method for estimating the frequency offset of phase modulation signals based on nonlinear transformation proposed by the present invention, the calculation process is as follows figure 2 As shown, the implementation steps are as follows:
[0036] (1) Acc...
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