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Forward error correcting method in one-way broadcast file transmission

A file transmission and forward error correction technology, applied in the field of forward error correction, can solve the problems of long time, occupying bandwidth, reducing bandwidth utilization, etc., and achieve the effect of high coding efficiency, saving bandwidth, and high channel utilization.

Inactive Publication Date: 2008-09-03
XIAN TONGSHI CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to be able to repair the discarded data blocks, the method of repeated transmission is adopted. Although the method of repeated transmission may repair the discarded data blocks, it takes a long time and occupies bandwidth, which reduces the utilization rate of bandwidth.

Method used

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  • Forward error correcting method in one-way broadcast file transmission
  • Forward error correcting method in one-way broadcast file transmission
  • Forward error correcting method in one-way broadcast file transmission

Examples

Experimental program
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Embodiment Construction

[0030] see figure 1 , the method process of the present invention is as follows:

[0031] 100) Split the data to be sent into multiple data blocks, and calculate the checksum of each data block;

[0032] 200) Carry out the XOR operation of the data blocks to the plurality of data blocks to calculate the protection data block; wherein the protection data block is according to the formula P 0 = S 1 ⊕ S 2 ⊕ S 3 ⊕ S 4 · · · ⊕ Sn - 2 ⊕ Sn - 1 ⊕ Sn Perform XOR operation while encoding the protected data block itself;

[0033] 300) On the same physical channel, sequentially send data blocks, including protection data blocks;

[0034] 400) Accept the data block, check whether the received data block is cor...

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Abstract

This invention relates to a forward EC method in single-way broadcast document transmission including the following steps: 100) depacketizing the to-be-sent data into multiple data blocks and computing the check sum of each data block; 200) processing XOR operation to the said multiple data blocks and computing protection data blocks; 300) sending contents of the data blocks including the protection ones; 400) receiving the data blocks; checking if the acquired data blocks are correct and making identifications; 500) adding up numbers of error data blocks; if there is only one error data block which has been accepted as a protection block, then correcting the mistake; and 600) direct split joint is carried out to resume the data in light of the coding rule, if there is no data error.

Description

1. Technical field [0001] The invention relates to a forward error correction method in unidirectional broadcast file transmission. 2. Background technology [0002] One-way broadcast file transmission refers to: at the broadcast end, split the file into data packets according to the protocol, modulate the data packets, and transmit them through the one-way broadcast transmission channel; The modulated data packet is demodulated, restored, and spliced ​​into the original file. In the field of unidirectional broadcast file transmission, since the unidirectional broadcast transmission channel used has no reverse transmission channel, forward error correction can only be used to correct erroneous data to improve the performance of data transmission. [0003] When a large file needs to be transmitted, it is generally impossible to transmit the large file as a data packet. The usual method is to split the large file into several small data blocks, encode the data block, and pass...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/16H03M13/03
Inventor 陈永健
Owner XIAN TONGSHI CO
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