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Method for detecting and correcting residual frequency offset of national standard of digital terrestrial broadcasting

A digital TV terrestrial and residual frequency offset technology, which is applied to multi-frequency code systems and other directions, can solve problems such as demodulation failure, and achieve the effects of less resources, simple circuit implementation, and less logic.

Active Publication Date: 2011-08-31
MAXSCEND MICROELECTRONICS CO LTD
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Problems solved by technology

At this time, interference between subcarriers will be introduced and cause the constellation diagram to rotate together. If the residual frequency offset is too large, it may cause demodulation failure.

Method used

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  • Method for detecting and correcting residual frequency offset of national standard of digital terrestrial broadcasting
  • Method for detecting and correcting residual frequency offset of national standard of digital terrestrial broadcasting
  • Method for detecting and correcting residual frequency offset of national standard of digital terrestrial broadcasting

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Embodiment Construction

[0022] see figure 1 As shown, in a specific implementation of the method for estimating the residual frequency offset of the national standard for digital TV terrestrial broadcasting according to the present invention, after the receiver system corrects the integer frequency offset and the fractional frequency offset respectively, the residual frequency offset can be detected and corrected . Specifically, the method includes the following steps: system information decoding, stable judgment, constellation point judgment, and frequency offset correction. Combine below Figure 7 Shown in detail:

[0023] Step 1, system information decoding.

[0024] There are 64 different system information modes preset in the DTMB system. At the transmitting end of the DTMB system, system information is transmitted using spread spectrum technology. These 64 kinds of system information can use the system information of 6 information bits before spreading. The 6-bit system information will b...

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Abstract

The invention discloses a method for detecting and correcting residual frequency offset of the national standard of digital terrestrial broadcasting, which comprises the steps: 1, decoding of system information: recovering the system information of 6 information bits; 2, stability determination: comparing the system information of 6 information bits solved by multi-frame data, determining that thesystem information is stable if the system information of the continuous multi-frame 6 information bits is totally same; determining that the system information is not stable if the stable system information of the continuous multi-frame is not searched in a certain frame number; and returning to the first step to receive the next data frame if the stable result is not determined; 3, constellation point determination: ending the detection and correction process of the residual frequency offset for a system in absence of the residual frequency offset; and performing the correction of the residual frequency offset for a system in presence of the residual frequency offset. The algorithm has the advantages of small complexity, less logic quantity, simple circuit implementation and less resources.

Description

technical field [0001] The invention relates to the field of wireless signal transmission, in particular to a method for detecting and correcting the residual frequency deviation of the national standard of digital TV terrestrial broadcasting. Background technique [0002] The national standard for digital terrestrial broadcasting - DTMB digital terrestrial multimedia broadcasting (DTMB digital terrestrial multimedia broadcasting) was officially approved as a mandatory national standard on August 18, 2006 and officially implemented on August 1, 2007. The standard has China's own intellectual property rights and integrates advanced technologies of single carrier and multi-carrier. The carrier number C of the system has two modes, C=1 or C=3780. [0003] In the DTMB system, the basic unit of the data frame structure is the signal frame, and the signal frame is composed of two parts: the frame header and the frame body. In the frame body part, 36 symbols of system information...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 蒋朱成张卓鹏吴涛
Owner MAXSCEND MICROELECTRONICS CO LTD
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