A method for solving direct frequency conversion i, q data distortion in a digital TV transmitting system
A technology for digital TV transmission and data distortion, which is applied to components of TV systems, components of color TVs, TVs, etc. It can solve problems such as inability to achieve self-adaptive pre-correction and inability to calculate, and achieve timely correction and accurate coefficients. Effect
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[0039] see Figure 5 , the present invention solves the method step of direct frequency conversion I, Q data distortion and is:
[0040] ① Align the data before the up-conversion and after the down-conversion. The data alignment method is to use the shift correlation method or the shift sum and subtraction method for the two sets of data.
[0041] ②Because the I and Q equations each have 3 unknowns, it is necessary to find 3 or more uncorrelated sequences and establish the I and Q equations. The specific method is to take the values of one point in each of the four quadrants of the I and Q signal distribution to form an uncorrelated sequence, and select a point with a higher probability of occurrence, and the amplitude and phase of this point are usually near the average value. I equation is , the Q equation is , where n is a natural number of 1, 2, 3...; where xi(n), xq(n) are the I and Q sequences before up-conversion, and yi(n), yq(n) are the I and Q sequences output...
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