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

Inactive Publication Date: 2016-12-21
BEIJING TONGFANG GIGAMEGA TECH
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Problems solved by technology

[0016] In the prior art, the correction coefficients for the above-mentioned signal distortions are usually obtained through artificial presets, which cannot be automatically calculated according to system changes, so the purpose of adaptive pre-correction cannot be achieved

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  • A method for solving direct frequency conversion i, q data distortion in a digital TV transmitting system
  • A method for solving direct frequency conversion i, q data distortion in a digital TV transmitting system
  • A method for solving direct frequency conversion i, q data distortion in a digital TV transmitting system

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Embodiment Construction

[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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Abstract

The invention relates to a method for solving direct frequency conversion I and Q data distortion of a digital television transmission system, which relates to the technical field of digital broadcast transmission. The method steps of the present invention are: 1. first align the data before the up-conversion and after the down-conversion; 2. find 3 groups or more than 3 groups of irrelevant sequences, and set up I and Q equations; 3. solve the equations to obtain the I-way coefficients C i and the Q-path coefficient C q ; ④ find a plurality of I, Q signal equation groups, each I road coefficient C that will obtain i and the Q-path coefficient C q Arithmetic mean is performed separately to obtain the average value of the coefficients. The method of the invention can automatically calculate the adjustment coefficients of the down-conversion output I and Q signals according to the system changes, so that the corrected I and Q values ​​are basically not affected by the non-ideal factors existing in the up- and down-conversion, and the correction is timely. , Accurate characteristics.

Description

technical field [0001] The invention relates to the technical field of digital broadcast transmission, in particular to a method for solving I and Q data distortion of direct frequency conversion. Background technique [0002] In a digital broadcast television transmitter, the peak-to-average ratio PAPR of the excitation signal of the power amplifier is too high, which will cause distortion of the power amplifier, and the exciter is usually required to have the function of adaptive pre-correction. Its implementation must obtain approximately ideal feedback data. If the method of baseband predistortion is adopted, the signal before up-conversion is I and Q, then the signal after down-conversion must be approximately equal to I and Q. However, most of the current digital exciters use direct conversion technology, because the amplitude and phase of the I and Q channels in the up and down conversion are unbalanced, which will generate unnecessary DC and image signals, resulting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36H04N5/38
Inventor 唐柳
Owner BEIJING TONGFANG GIGAMEGA TECH
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