Decimal frequency bias estimation method and apparatus of receiver

Abstract

The invention discloses a decimal frequency bias estimation method of a receiver and a relative device, for processing decimal frequency bias estimation on the received signals with different frame head sequence modes and carrier frequency bias. The method comprises: (1) setting all frame head sequence modes into a same structure as N+L+N, setting delta B=F / N+L, wherein F is the base band sampling rate of the system; (2) receiving the received signals with carrier frequency bias, synchronously capturing the received signals to attain the frame head sequence mode of the received signals, and selecting corresponding N and L according to the frame head sequence mode; (3) according to the selected N and L, processing sliding auto correlation on the received signals to attain the output result of the sliding auto correlation; (4) according to the output result of the sliding auto correlation, estimating decimal frequency bias. The inventive decimal frequency bias estimation has the advantages of wide application and high estimation effect.

Description

technical field [0001] The invention belongs to the technical field of terrestrial digital television broadcasting, and in particular relates to a method and device for estimating fractional frequency offset of a receiver. Background technique [0002] In August 2006, China promulgated the mandatory national standard GB 20600-2006 "Digital TV Terrestrial Broadcasting Transmission System Frame Structure, Channel Coding and Modulation", thus ending years of technical debate on digital TV terrestrial transmission standards, and for the subsequent The industrialization process of terrestrial digital TV has opened a door. In the literature, DTMB (Digital Terrestrial / Television Multimedia Broadcasting) is often used as the abbreviation of China's digital terrestrial transmission standard. [0003] Currently there are three digital TV terrestrial transmission standards in the world except China. Some countries mainly in the United States have adopted the ATSC (Advanced Television...

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Problems solved by technology

However, as an option of the DTMB standard, the dual pilot signal may not necessarily be transmitted. If it is not transmitted, the carrier frequency offset cannot be estimated; in addition, the cross-correlation method also has the disadvantage of poor estimation performance.

In addition, other methods mentioned in the previous DTMB literature also have the disadvantage of a small estimation range

[0011]The carrier frequency offset of the DTMB system receiver includes two parts: integer frequency offset and fractional frequency offset, so one method that can be considered is, for fractional frequency offset and integer After the frequency offset is estimated separately, the carrier frequency offset of the DTMB system receiver is obtained. However, how to estimate the fractional frequency offset of the DTMB system receiver is still an unsolved problem

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