Device and method for tracking phase error in digital TV receiver
AssigneeLG Electronics Inc.
InventorWoo Chan Kim
Life of this patent
Estimating the term…
Abstract
Device and method for tracking a phase error in a digital TV receiver, wherein a phase noise compensated I signal is subtracted from I level reference signals of VSB signal, to obtain an error of the I signal, a sign of the Q signal having a phase noise thereof compensated is multiplied to the error of the I signal from the error determining part, to estimate a basic phase error, and a phase error compensating area is determined, a preset constant ‘α’ is multiplied to the basic phase error to provide a final phase error in the determined phase error compensating area, and the basic phase error is provided as it is as the final phase error in other areas, thereby estimating the phase error more accurately.
Claims15
A device for tracking a phase error in a digital TV receiver, in which an I signal is restored from a signal transmitted in VSB modulation system, a Q signal is estimated from the restored I signal, a phase noise is tracked from the restored I signal and the estimated Q signal, and the phase noise is compensated, comprising:
- an error determining part for subtracting the phase noise compensated I signal from I level reference signals of VSB signal, to obtain an error of the I signal;
- a basic phase error estimating part for multiplying a sign of the Q signal having a phase noise thereof compensated to the error of the I signal from the error determining part, to estimate a basic phase error;
- a phase error compensating part for determining a phase error compensating area, multiplying a preset constant ‘α’ to the basic phase error to provide a final phase error in the determined phase error compensating area, and providing the basic phase error as it is as the final phase error in other areas;
- and
- a phase noise compensating part for adjusting a gain of the estimated final phase error, making complex multiplication of a sine value and a cosine value proportional to the gain adjusted phase error value to the restored I signal and the estimated Q signal, to compensate for the phase error remained in the restored I signal and the estimated Q signal.
A method for tracking a phase error in a digital TV receiver, in which an I signal is restored from a signal transmitted in VSB modulation system, a Q signal is estimated from the restored I signal, a phase noise is tracked from the restored I signal and the estimated Q signal, and the phase noise is compensated, comprising the steps of:
- (a) subtracting the phase noise compensated I signal from I level reference signals of VSB signal, to obtain an error of the I signal;
- (b) multiplying a sign of the Q signal having a phase noise thereof compensated to the error of the I signal from the error determining part, to estimate a basic phase error;
- (c) determining a phase error compensating area, multiplying a preset constant ‘α’ to the basic phase error to provide a final phase error in the determined phase error compensating area, and providing the basic phase error as it is as the final phase error in other areas;
- and
- (d) adjusting a gain of the estimated final phase error, making complex multiplication of a sine value and a cosine value proportional to the gain adjusted phase error value to the restored I signal and the estimated Q signal, to compensate for the phase error remained in the restored I signal and the estimated Q signal.
Dependencies are inferred from the claim text.