Integral frequency bias and fine synchronization method and apparatus of receiver

Abstract

The invention discloses an integer frequency bias estimation and fine synchronization method of a receiver and discloses a device thereof, for processing integer frequency bias estimation on the received signals of different frame head sequence modes and carrier frequency bias. The method comprises that: (1) a receiver first processes synchronous capture on the received signals, to attain the coarse synchronization positions and the frame head modes of the received signals; (2) the receiver processes decimal frequency bias estimation on the received signals and then processes decimal frequency bias compensation on the received signals; (3) the receiver attains the real phase of the pseudo random sequence of the frame head with the frame head mode having phase rotation; (4) according to the coarse synchronization position, the frame head mode and the phase of the frame of the received signals, the receiver processes integer frequency bias estimation on the received signals after the decimal frequency bias compensation. The invention can realize integer frequency bias estimation on the receiver of a DTMB system, having better estimation performance and large estimation range.

Description

technical field [0001] The invention belongs to the technical field of terrestrial digital television broadcasting, and in particular relates to a receiver integer frequency offset estimation method and device, and a method and device for simultaneously performing integer frequency offset estimation and fine synchronization. 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 wo...

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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 to obtain the carrier frequency of the DTMB system receiver after separately estimating the fractional frequency offset and integer frequency offset However, how to estimate the integer frequency offset of the DTMB system receiver is still an unsolved problem

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