Bit interleaving method for digital TV ground transmission

A digital TV terrestrial and bit interleaving technology, applied in the field of digital signal transmission, can solve problems such as affecting system performance, uneven distribution of data errors at the receiving end, and signal-to-noise ratio threshold damage.

Inactive Publication Date: 2007-08-22
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In the high bit rate 16-OQAM transmission mode of the ADTB-T system, due to the difference in confidence between the high and low bits of the Gray map connected after bit interleaving, the error distribution in the receiving end data is artificially caused to be uneven, which has a negative impact on the SNR threshold. Certain damages that affect system performance

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  • Bit interleaving method for digital TV ground transmission
  • Bit interleaving method for digital TV ground transmission
  • Bit interleaving method for digital TV ground transmission

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0042] The present invention can be applied to the digital television terrestrial transmission system (ADTB-T system) high code rate 16-OQAM transmission mode that the applicant designs, and TPC (M 2 ,M 1 ; N 2 , N 1 ) code combination to improve the system's ability to resist burst errors. For TPC (M 2 ,M 1 ; N 2 , N 1 ) encoded data block TPC(M 2 ×N 2 ) for bit interleaving. Each time there are K TPC encoded data blocks TPC(M 2 ×N 2 ) participate in bit interleaving. In the ADTB-T system, M 2 , M 1 , N 2 , N 1 128, 120, 128 and 120 respectively. When interleaving and outputting, the data at the same position of each TPC block is sequentially output in the order of K TPC blocks; the output of data in each TPC block is arranged in diagonal order.

[0043] For the high code rate 16-OQAM transmission mode, K can be selected as 32, 64, 128 o...

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Abstract

The present invention discloses one kind of bit interleaving method for digital TV ground transmission. The method performs bit interleaving treatment of data block TPC(M2XN2) obtained via coding TPC(M2, M1, N2, N1), and there are K data blocks TPC(M2XN2) after TPC coding in the bit interleaving of each time. In the first step, the bit data in the same position of the TPC blocks from 1 to K are output successively and the data in all TPC blocks are output in diagonal order; and in the second step, the bit flow is divided into L blocks of P bits each and the data in [L/2] or [L/2]+1 blocks have the adjacent bits exchanged while maintaining the other blocks unchanged. The present invention can further strengthen the burst error resisting ability of digital TV ground transmission system.

Description

technical field [0001] The invention belongs to the field of digital signal transmission, in particular to a bit interleaving processing method for data in a digital TV terrestrial broadcasting transmission system. Background technique [0002] A typical digital TV terrestrial broadcast transmission system includes a transmitter and a receiver. Digital modulation technology often encodes digital signals, and then adds necessary auxiliary information, such as: synchronization signals, pilot signals, etc. The coded digital signal forms a baseband signal after channel filtering. The baseband signal is modulated to a corresponding frequency band through an up-converter and then sent. At the receiving end, the tuner converts the high-frequency signal to the baseband to obtain a digital signal through an analog-to-digital converter. After the digital signal is processed, it is restored to the same information as the sending end. [0003] In digital TV broadcasting, bursty bit ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24H04N7/015
Inventor 梁伟强管云峰归琳汪慎葛莹
Owner SHANGHAI JIAO TONG UNIV
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