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Frequency interlacer and frequency interlacing method in DTMB (Digital Terrestrial Multimedia Broadcasting) system

A technology of frequency interleaving and system frequency, applied in the field of realization of frequency domain interleaving, can solve the problem that the wrong pattern cannot be completely corrected, and achieve the effect of improving the operation speed and reducing consumption

Inactive Publication Date: 2010-12-15
苏州威士达信息科技有限公司
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Problems solved by technology

When the burst error length exceeds the error correction capability of the channel coding scheme, the channel coding technology cannot completely correct the error pattern and restore the correct transmission data

Method used

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  • Frequency interlacer and frequency interlacing method in DTMB (Digital Terrestrial Multimedia Broadcasting) system
  • Frequency interlacer and frequency interlacing method in DTMB (Digital Terrestrial Multimedia Broadcasting) system
  • Frequency interlacer and frequency interlacing method in DTMB (Digital Terrestrial Multimedia Broadcasting) system

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0029] DTMB's frequency domain interleaving technology regulates the correspondence between the modulation constellation point symbols and 3780 effective subcarriers in the frame, and maps the array X to Y. X, Y, and Z are all arrays containing 3780 elements. X is the array before interleaving, its first 36 elements are system information symbols, and the last 3744 elements are data symbols. The DTMB standard stipulates that the process of mapping X to Y is divided into two steps: first, X is mapped to Z, and the system information symbols are inserted into the data symbols; then Z is mapped to Y, and the system information symbols are regrouped and placed together, but the order is broken Messed up. After frequency interleaving, the data symbols are randomly distributed in the array Y accordi...

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Abstract

The invention provides a method for solving the problem of frequency interlacing of a DTMB (Digital Terrestrial Multimedia Broadcasting) system, which is characterized in that a frequency interlacer of the DTMB system executes the following steps of: exhausting the mapping relationship between a source address and a destination address of the frequency interleaver by using 7 recirculating counters; judging whether a sign corresponding to the source address is system information or data by only utilizing less than 5 of the recirculating counters so as to compute the source address; carrying out weighted summation and destination address computation on all the 7 recirculating counters by adopting an add tree, and resolving weight factors into the sum of signed numbers so as to convert multiply operation between the weight factors and the counter values into add operation.

Description

technical field [0001] The invention relates to digital terrestrial television broadcasting technology, in particular to a method for realizing frequency domain interleaving in a DTMB system. Background technique [0002] When signals are transmitted in mobile wireless channels, they are susceptible to various interferences. For an Orthogonal Frequency Duplex Multiplexing (OFDM) system, these interferences will not only cause signal fading on a certain discrete frequency, but may also cover multiple adjacent discrete carriers, resulting in burst errors. In order to overcome interference in a larger frequency range and improve transmission quality, it is necessary to resort to frequency domain interleaving. [0003] Frequency interleaving means that after the sending end scrambles the data to be transmitted according to a certain pseudo-random rule, it is distributed on continuous carriers for transmission; the receiving end performs frequency deinterleaving, reorders after ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 张鹏刘晋万昕
Owner 苏州威士达信息科技有限公司
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