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Optimization method for frequency domain deinterleave in terrestrial digital television broadcasting system

A technology for terrestrial digital television and broadcasting systems, which is applied in the optimization field of frequency domain deinterleaving, and can solve the problems of periodic interference becoming burst errors, implementation complexity and high equipment costs

Inactive Publication Date: 2007-05-30
SHANGHAI FUDAN MICRONANO ELECTRONICS
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Problems solved by technology

Frequency domain interleaving is a variant of matrix interleaving—random interleaving. The disadvantage of matrix interleaving is that it may turn some periodic interference into burst errors, while random interleaving greatly reduces the probability of such errors. In random interleaving In , the order in which the coding sequence is filled into the matrix is ​​determined by the value of a pseudo-random sequence or directly generated by computer search, which makes this interleaving technology quite adaptable to the variability of burst parameters, but its implementation complexity and Equipment costs are also higher

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  • Optimization method for frequency domain deinterleave in terrestrial digital television broadcasting system
  • Optimization method for frequency domain deinterleave in terrestrial digital television broadcasting system

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[0090] It can be seen from the frame diagram in Figure 1 that after the output data of the FFT processor is processed by the equalizer and the co-channel interference detection module, the obtained data is used as the input data of the frequency domain deinterleaving module for deinterleaving processing, and the output data of the frequency domain deinterleaving As the input data of the next-level module, the time-domain deinterleaving process is performed.

[0091] In order to complete the deinterleaving process by reading the address, the data is sequentially written into the RAM. During the data input of odd frames, the highest bit of the write address is 0, which corresponds to the low address area of ​​the RAM. During even frame data input, the most significant bit of the write address is 1, which corresponds to the high address area of ​​RAM.

[0092] From the code that generates the read address, we can see that the read address when reading data each time can be genera...

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Abstract

This invention belongs to digital television signal modulation technique field and to one earth digital television broadcast system middle frequency interlace optimization method, which separates data characters from first and second interlace devices for two time interlace simplifying to fulfill the above two interlace function by one.

Description

technical field [0001] The invention belongs to the technical field of digital TV signal modulation, and specifically relates to an optimization method for deinterleaving in the frequency domain in a terrestrial digital TV broadcasting system aiming at the Chinese digital TV terrestrial transmission standard. Background technique [0002] Frequency domain interleaving can effectively overcome frequency selective fading. Frequency domain interleaving technology is a frequency extension technology that reduces the correlation of channel errors. When the interleaving depth is large enough, burst errors are discrete into random errors. Create better conditions for correct decoding. Frequency domain interleaving is a variant of matrix interleaving - random interleaving. The disadvantage of matrix interleaving is that it may turn some periodic interference into burst errors, while random interleaving greatly reduces the probability of such errors. In random interleaving In , the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/015H03M13/27
Inventor 严伟李冬梅周本根
Owner SHANGHAI FUDAN MICRONANO ELECTRONICS
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