| 摘要 |
A method for estimating the frequency error of a demodulator for restoring two binary signals carried on two carriers of same frequency but in phase quadrature, including the steps of forming vectors having as components the successive couples of values of the two binary signals; applying to each vector a transform which multiplies by four its angle at least when it is equal to a multiple of pi/4 and which substantially preserves its module; and calculating the average of the transformed vectors. The frequency error is obtained as being the derivative of the angle of the average vector.
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