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Pseudo random code sequence phase capturing method and capturing device

A pseudo-random code and code sequence technology, applied in the field of digital TV broadcasting, can solve problems affecting signal synchronization, affecting PN code sequence phase capture, etc., and achieve the effect of avoiding interference

Active Publication Date: 2010-11-24
ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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Problems solved by technology

The timing error will affect the phase acquisition of the PN code sequence, thereby affecting the signal synchronization

Method used

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  • Pseudo random code sequence phase capturing method and capturing device
  • Pseudo random code sequence phase capturing method and capturing device
  • Pseudo random code sequence phase capturing method and capturing device

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Embodiment Construction

[0030] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0032] As mentioned in the background technology section, in the actual signal transmission process, due to various signal interferences, such as timing synchronization interference, the number of symbols in the signal frame actually received by the receiver may change, which makes the frame of the signal frame body length changes. This frame body length error is called a timing error, and the timing error will seriously affect the phase ...

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Abstract

The invention relates to a pseudo random code sequence phase capturing method used for simultaneous receiving of digital television terrestrial broadcasting signals. The method comprises the following steps: acquiring adjacent signal frames in received signals, extracting frame header PN code sequences of the signal frames, carrying out slide-correlating operation on the frame header PN code sequences and local PN code sequences to obtain a correlation result, and detecting a correlated peak position corresponding to each signal frame; based on the correlated peak positions, carrying out first-difference operation on the correlated peak positions of the adjacent signal frames in the received signals to obtain correlated peak intervals and peak deviations corresponding to the signal frames; carrying out second-difference operation on the adjacent peak deviations to obtain a second-difference differential value; and searching a second-difference differential value search sequence for a result corresponding to the second-difference differential value, and determining sequence numbers corresponding to the signal frames. The pseudo random code sequence phase capturing method eliminatesthe influence of timing errors on the adjacent signal frames and avoids the interference of timing errors on the pseudo random code sequence phase capturing by using the second-difference method.

Description

technical field [0001] The present invention relates to the technical field of digital television broadcasting, and more specifically, the present invention relates to a method and device for phase acquisition of a pseudo-random code sequence for digital television terrestrial broadcasting signals. Background technique [0002] With the rapid development of digital TV technology, the requirements for digital TV broadcasting technology used to transmit digital TV signals are getting higher and higher. Digital TV broadcasting mainly adopts three transmission methods, namely satellite broadcasting, cable TV broadcasting and terrestrial wireless broadcasting. Among the three digital TV broadcasting methods, terrestrial wireless broadcasting is the most widely used, especially suitable for countries with vast territories and complex broadcasting networks. However, ground electromagnetic wave interference is serious, especially the multipath time delay and amplitude change speed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26H04L27/26H04N5/44
Inventor 陈岩蒋崎刘小同李一凡
Owner ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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