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A frequency compensation method and device capable of combating large frequency offsets

A technology of frequency offset compensation and frequency compensation, which is applied in the field of DVB-T2 receivers, can solve problems such as signal loss, local carrier adjustment range cannot be greatly adjusted, and frequency offset compensation cannot be achieved, so as to improve the frequency offset compensation capability and improve The performance against large frequency deviation and the effect of maintaining integrity

Active Publication Date: 2016-12-21
扬智电子科技(中国)有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When a large frequency offset occurs, since the frequency offset compensation range of the intermediate frequency is fixed, the adjustment range of the frequency offset of the local carrier cannot be greatly adjusted, otherwise it will cause signal loss
The range of frequency offset compensation in the prior art is within 900kHz, and it is impossible to perform large-scale frequency offset compensation

Method used

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  • A frequency compensation method and device capable of combating large frequency offsets
  • A frequency compensation method and device capable of combating large frequency offsets
  • A frequency compensation method and device capable of combating large frequency offsets

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Embodiment Construction

[0045] figure 2 It is a DVB-T2 receiver with a frequency offset compensation device according to an embodiment of the present invention. The receiver includes a tuner 21 , an analog / digital converter 23 , a frequency compensation control device 25 , a numerically controlled oscillator 22 (NCO), a P1 detection demodulation module 29 , a synchronization module 28 , a carrier compensation module 27 and a multiplier 26 . Tuner 21 converts the T2 signal into a signal having a desired output frequency, such as an intermediate frequency (IF) signal. The receiver will set an initial IF frequency offset compensation value for the tuner 21 . Then, an analog / digital converter (ADC) digitizes the converted signal at a predetermined sampling frequency. The numerically controlled oscillator 22 (NCO) is a device that generates a local carrier, and its output includes two orthogonal digital frequency outputs. The numerically controlled oscillator 22 (NCO) is an indispensable link in the do...

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Abstract

The invention provides a frequency offset compensation device. The frequency compensation device comprises a P1 detection demodulating module, a frequency compensation control device and a carrier wave compensation device, wherein the P1 detection demodulating module is used for detecting a frequency offset value of a precursor symbol P1 in a DVB-T2 (Digital Video Broadcasting-Terrestrial) signal; the frequency compensation control device compares the frequency offset value with the preset threshold value; when the frequency offset value is larger than the preset threshold value, the frequency compensation control device regulates an intermediate frequency offset compensation value of a tuner; when the frequency offset value is not larger than the preset threshold value, the frequency compensation control device instructs the carrier wave compensation device to perform frequency offset compensation on the local carrier wave; the carrier wave compensation device performs frequency offset compensation on the local carrier wave according to instruction of the frequency compensation control device.

Description

technical field [0001] The invention relates to a DVB-T2 receiver, in particular to a DVB-T2 receiver capable of resisting large frequency deviation. Background technique [0002] DVB-T2, hereinafter referred to as T2, is the second-generation European digital terrestrial television broadcasting transmission standard. It describes a multi-carrier signal. Its standard was announced in June 2008. Its independent carrier containing valid data is modulated by QAM. And the maximum TS stream transmission rate supported within the 8MHz spectrum bandwidth is about 50.1Mbit / s (if the empty packets that may be removed are included, the maximum TS stream transmission rate can reach 100Mbit / s). [0003] figure 1 The frame structure of the DVB-T2 system is shown. Such as figure 1 As shown, a super frame (Super Frame) consists of N T2 Each T2 frame starts with the leading symbol P1, followed by N P2 A P2 symbol and a data symbol with a length of L, following the T2 frame are Future E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L25/02H04L25/03
Inventor 王宇丁恒
Owner 扬智电子科技(中国)有限公司
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