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Method and apparatus for channel coding and interleaving in mobile media broadcast

A mobile multimedia and channel coding technology, applied in the field of mobile digital multimedia broadcasting, can solve the problems of increasing processing delay, not using outer code, increasing de-interleaving and outer decoding, etc., to achieve the effect of improving processing speed and efficiency

Inactive Publication Date: 2007-08-08
이노피데이인코포레이티드
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Problems solved by technology

In this way, when the internal decoding is correct, additional decoding, interleaving and external decoding processes will be added, which increases the processing delay to a certain extent and wastes system resources.
[0007] In addition, the existing multimedia broadcasting standards only use one type (such as DVB-T, DVB-S) or do not use external codes to simplify framing
In this way, when the environmental signal of the receiver is not good, the quality problem of multimedia data such as images can only be solved by increasing the power consumption of the receiver, and it cannot provide data transmission of different quality levels according to different service requirements. It is difficult to find the best choice between transmission rate, bit error rate and radiated power consumption

Method used

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  • Method and apparatus for channel coding and interleaving in mobile media broadcast

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no. 1 example

[0058] Because the RS code has a strong ability to correct burst errors and random errors, the outer coding of the present invention adopts RS coding.

[0059] The RS code is a cyclic code based on the finite field GF(256). Among them, the set GF(256) contains the following elements:

[0060] GF(256)=0, α 0 , Α 1 , Α 2 ,...,Α 254 .

[0061] Among them, α is the root of the following polynomial: p(x)=x 8 +x 4 +x 3 +x 2 +1.

[0062] For RS code (n, k), the generator polynomial is:

[0063]

[0064] Among them, n is the code length, K is the number of bytes of the information sequence in a codeword, and t is the number of errors that can be corrected.

[0065] In time domain coding, the information vector to be coded is: (m n-2t-1 , M n-2t-2 ,..., m 0 ), which constitutes the information polynomial:

[0066] m(x)=m n-2t-1 x n-2t-1 +m n-2t-2 x n-2t-2 +...+m 1 x+m 0

[0067] Get the code polynomial after encoding:

[0068] C(x)=m(x)×x 2t +R(x),

[0069] Among them, R(x)=m(x)×x 2t mo...

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Abstract

The invention relates to one mobile digital multi-media broadcast signal channel coding and knitting method and device, wherein, the device comprises the following parts: LDPC coding device and inner knitting device by use of bit and outer coding and knitting device for data flow input on RS(240, M) for short codes and outer coding; then sending the outer codes and knitting data into LDPC coder, wherein, the M is for information bit length, then the outer coder and knit device for LDPC knitting to fulfill signal coding and knit process.

Description

Technical field [0001] The present invention relates to the field of mobile digital multimedia broadcasting, in particular to a method and device for channel coding and interleaving in mobile digital multimedia broadcasting. Background technique [0002] In the transmission of the signal on the channel, the transmission medium will introduce a series of effects on the signal, such as fading, distortion, interference, and noise, which will cause bit errors at the receiving end. Through channel coding, interleaving and other links, the corresponding processing of the digital stream can greatly reduce the bit error rate. [0003] Mobile multimedia broadcasting is a mobile transmission system for handheld terminals. Figure 1 shows the structure of a channel coding and interleaving device 10 in a traditional multimedia broadcasting system, including an outer encoder 101, a foreign interleaver 102, an inner encoder 103, and an inner interleaver.器104. The input data stream, such as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H03M13/29H03M13/13H03M13/19H03M13/27
Inventor (发明人要求不公开姓名)
Owner 이노피데이인코포레이티드
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