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Method for correcting symbols regularly in DVB-T2 system

A DVB-T2, symbol timing technology, applied in the multi-frequency code system and other directions, can solve the problems such as the inability to apply to the DVB-T2 system, the large chip COST and POWER, and the large amount of calculation.

Active Publication Date: 2013-10-09
HUNAN GOKE MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the formula (1), we can see that in the 32K and 16K modes, because the sliding window is relatively large, the computational load of this method is very large, which means that the COST and POWER of the chip will be relatively large
On the other hand, because the shortest GI length is only 64 points (1 / 128GI in 8K mode, or 1 / 32GI in 1K mode), the peak value after sliding correlation is very small, when there is a multipath channel and the frequency offset error is relatively large When , the peak value will not be obvious, resulting in a high probability of misjudgment, that is, the performance of the chip cannot be guaranteed
Therefore, the symbol timing method of DVB-T is obviously not applicable to the DVB-T2 system, and it needs to be improved.

Method used

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  • Method for correcting symbols regularly in DVB-T2 system
  • Method for correcting symbols regularly in DVB-T2 system
  • Method for correcting symbols regularly in DVB-T2 system

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Embodiment Construction

[0048] In DVB-T2 and other digital TV systems, the synchronization module generally performs symbol synchronization first and then performs pattern detection and frequency offset estimation. The former is to find the exact position of the signal frame and symbol, and the latter is to complete further signal analysis and analysis to find the transmission mode and frequency offset of the system.

[0049] [a] Symbol synchronization

[0050] 1) Use S1 and S2 to generate the P1 symbol.

[0051] After the frame synchronization is locked, two parameters S1 and S2 will be provided. These two parameters indicate the FFT mode and MISO mode adopted by the current system, which determine the content and structure of the frame header P1 symbol of the DVB-T2 system.

[0052] Table 1S1 and S2 modulation modes

[0053]

[0054] As can be seen from the above table, S1 and S2 are 3-bit and 4-bit parameters, corresponding to 8 and 16 possible sequences, respectively. The sequence length co...

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Abstract

The invention discloses a method for correcting symbols regularly in a DVB-T2 system. In symbol synchronization, PI symbols regenerated in a receiver are utilized to correlate to received signals to find initial positions of OFDM symbols; segmentation operation is conducted on correlation operations; P2 pilot frequency time domain signals locally generated are utilized to correlate to the received signals according to the initial positions of the symbols; weighted average is conducted on five-point sliding results, and then the corresponding GI mode and the position of the maximum are found out. The method greatly reduces operation amount and operation cost and improves mode detection accuracy.

Description

technical field [0001] The present invention relates to a method for symbol timing and pattern detection in a DVB-T2 system. Background technique [0002] In a multi-carrier system, in order to maintain the orthogonality of OFDM symbols and minimize mutual interference (ISI) between OFDM symbols, a guard interval (GI) is usually inserted between two OFDM symbols to achieve the above the goal of. That is, a certain proportion of the tail of the current OFDM symbol is copied to the starting position of the current OFDM symbol. [0003] In a multi-carrier system, in order to adapt to different channel environment conditions, there are usually a variety of guard interval ratio modes to choose from. In the receiver, the length of the guard interval selected by the current system must be determined to correctly determine the start of the OFDM symbol. Location. In a multi-carrier system, in order to receive the signal correctly, the receiver must determine the starting position ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 朱志敏
Owner HUNAN GOKE MICROELECTRONICS
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