Carrier track loop adaptive for digital television terrestrial broadcasting
A digital TV terrestrial and carrier tracking loop technology, applied in the direction of AM carrier system, high-definition television system, electrical components, etc., can solve problems such as signal damage, and achieve the effect of removing frequency jitter
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[0025] The embodiments are further described below in conjunction with the accompanying drawings.
[0026] image 3 The basic structure of the carrier tracking loop of the present invention and the block diagram of NCO driving information generation are shown. The carrier tracking loop includes an FIR of an equalizer, a DFE of an equalizer, a complex multiplier, an adder, a decision device, a subtractor, a real multiplier, an accumulator, and a loop low-pass filter.
[0027] Among them, the loop low-pass filter can generally be replaced by an active proportional-integral filter.
[0028]Its main workflow is: the complex signal obtained after OQAM demodulation is composed of I and Q signals (I+jQ); the output after the complex equalization FIR is still a complex signal (I′+jQ′), (I'+jQ') and the total phase difference complex multiplication (equivalent to phase derotation), remove the frequency and phase jitter, and take out the real baseband signal; the above real baseban...
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