Device and method for correcting integer frequency multiplication ratio error of digit multimedia broadcast receiver

Abstract

Present invention relates to whole number frequency multiplication rate error correction device and method for digit multimedia broadcast receiver. It contains multiplier for multiplication of received signal and modified integral multiple frequency error and clearing integral multiple frequency error, PRS generator for outputting standard PRS signal, part correlator for obtaining correlation numeric value, calculator, and corrector. Said invention utilizes partial correlation accurately concluding and clearing integral multiple frequency error, accurately to proceed frequency synchronism even if on vile receiving condition, using PRS signal to proceed modification to tiny signal timing offset, to raise whole ground wave DMB receiver performance.

Description

(1) Technical field [0001] The present invention relates to the technology of digital multimedia broadcasting (Digital Multimedia Broadcasting: hereinafter referred to as DMB) receiver, in particular to an integral multiple frequency error correction of a digital multimedia broadcasting receiver that estimates and corrects the integer frequency error generated when receiving DMB signals Devices and methods. (2) Background technology [0002] The digitization of broadcasting has brought influence to the existing analog radio broadcasting, and brought the era of digital radio broadcasting ahead of schedule. Moreover, not only existing voice radio services can be provided, but also digital multimedia broadcasting (DMB) including data transmission and multimedia services is possible. The above-mentioned DMB has the advantages of effectively preventing noise and distortion on the transmission channel, high transmission efficiency, and being able to provide various multimedia ser...

AI Technical Summary

Problems solved by technology

First, due to the error generated by the local oscillator (Local Oscillator), there is an error between the transmitted frequency and the received frequency

Second, due to the phase error between the clock frequency of the DMB receiving end and the clock frequency of the DMB sending end, there is an error between the transmitted frequency and the received frequency

[0024] When the above-mentioned DMB receiving end generates a fractional frequency error, due to the generation of adjacent carrier interference (Intercarrier Interference), the right angle between the carriers is no longer maintained, so an error occurs

[0025] On the other hand, when the above DMB receiving end generates an integer multiple error, although the right angle is maintained, because the carrier does not carry the required information, but other information is loaded, the error still occurs

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