Frequency error correcting device of DMB receiver

Abstract

This invention relates to a correction device of frequency errors of DMB receivers utilizing said device to test and eliminate the integral frequency error possibly appearing when receiving DMB signals, in said device, after setting a shift register with N timers, a storage and a comparator, a part correlator inputs the PRS signals into the shift register to be shifted sequently and inputs and stores the received PRS signals into the register then to find out the output leading to the shift register and part correlated values of the signals stored in said storage, an error computer carries out accumulation in each of the set part and region to said N+1 part correlated values the part correlator to get the whole correlation sum by accumulating the correlated part and a symbol period and update the stored maximum value to said maximum integer correlation sum so as to eliminate the entegral frequency errors appearing when receiving DMB signals.

Description

technical field [0001] The invention relates to a terrestrial wave DMB receiver, in particular to a "frequency error correction device" for inferring and correcting frequency errors of received DMB signals. Background technique [0002] The digitization of broadcasting has had an impact on existing analog radio broadcasting and has preceded the arrival of digital broadcasting. In addition, not only the existing audio radio services can carry out digital multimedia broadcasting (DMB), but even data transmission and multimedia services have begun to carry out digital multimedia broadcasting. Digital multimedia broadcasting has the ability to strongly suppress noise and deformation in the transmission channel, so as to perform efficient and diverse multimedia services. [0003] Digital Multimedia Broadcasting (DMB) adopted in Korea is based on Eureka-147 Digital Radio Broadcasting (DAB) used in Europe as a terrestrial radio standard. In order to improve the performance of mul...

AI Technical Summary

Problems solved by technology

[0024] At this time, if a fractional frequency error occurs in the above-mentioned DMB receiving end, adjacent carrier interference (Intercarrier Interference) will occur, so the orthogonality between the carriers cannot be maintained, so errors will occur.

[0025] On the other hand, if an integer frequency error occurs in the DMB receiving end mentioned above, although the orthogonality is maintained, an error will also occur because the carrier carries other information than the required information.

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