Unlock instant, AI-driven research and patent intelligence for your innovation.

Carrier return device for multiple-rank arrangement

A carrier recovery and subcarrier spacing technology, applied in color TV parts, TV system parts, TV and other directions, can solve the problems of estimating performance impact, destroying repetitive structures, unable to track carrier frequency offset, etc. The effect of frequency offset range

Inactive Publication Date: 2009-10-14
SHANGHAI JIAOTONG UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in practice, the ISI introduced by the multipath channel has destroyed this repetitive structure, so the estimation performance is affected; the second algorithm can provide better estimation results, but because the inserted pilot reduces the information rate, the inserted The number of pilots must be less than the data. In addition, OFDM will cause ICI due to the influence of frequency offset. If there is ICI, it will definitely destroy the performance of frequency estimation.
[0006] To sum up, regardless of the American ATSC or European DVB-T digital television broadcasting system, under the condition of multipath fading in the actual wireless communication system, the frequency detector of the system will be seriously affected and cannot track the carrier frequency offset, thus Affects the performance of the entire broadcast receiver

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carrier return device for multiple-rank arrangement
  • Carrier return device for multiple-rank arrangement
  • Carrier return device for multiple-rank arrangement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0073] The following uses the carrier recovery device with multi-stage structure of the present invention in a multi-carrier transmission system for handheld mobile multimedia as a preferred embodiment of the present invention to be described. Of course, as understood by those skilled in the art, the application of the present invention is not limited thereto.

[0074] When the system is an OFDM transmission system, if the length of an OFDM symbol is N=4096, the length of the time domain synchronization header is N g =512, then the finely estimated delay time is N s =N+N g =4608; when the system is a single-carrier transmission system, if the length of the frame body data N=3780, the length of the time domain synchronization header is N g =420, then the finely estimated delay time is N s =N+N g =4200.

[0075] figure 2 It is a block diagram of a multi-stage carrier recovery device according to a preferred embodiment of the present invention; as figure 2 As shown, the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a carrier wave recover device with multi-step structure, and relative method, wherein it comprises: a frequency correct multiple device for correcting the carrier wave frequency of digit transmission signal; one separator for separating the time domain synchronous head from the digit transmission signal; several frequency shift evaluators for inputting said synchronous head, via different shift evaluation methods, to evaluate the carrier wave frequency shift in different regions when resonating the digit transmission signal; and a composite unit for combining said frequency shift; and the carrier wave recover uses combined frequency shift to recover the carrier wave. The invention uses several frequency shift combined evaluations and one-step track circuit to avoid the device affected by multi-path signal channel to recover the carrier wave accurately.

Description

technical field [0001] The present invention relates to a device and a method for recovering a carrier in a receiver of a digital television terrestrial broadcasting system, in particular to a device and a method for recovering a carrier with a multi-stage structure, which can be estimated according to the time-domain synchronization header in the transmission signal and the compensation occurs during tuning During the frequency offset of the carrier. Background technique [0002] figure 1 A system block diagram of a conventional multimedia television broadcast receiver in the prior art is shown. In the system block diagram of the current conventional multimedia television broadcast receiver, the received signal received by the antenna 10 enters the tuner 12, and the tuned signal passes through the SAW filter 14, the intermediate frequency amplification unit 16, the ADC unit 18 and the baseband processing unit 20 respectively. , the baseband processing unit 20 outputs the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04N21/41
Inventor 归琳刘勃
Owner SHANGHAI JIAOTONG UNIV