Generating device and method of constant coefficient matrix in reed-solomon (RS) code of China mobile multimedia broadcasting (CMMB) system

A generation device and constant coefficient technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of large amount of calculation, slow generation of constant coefficient matrix, etc., achieve low calculation amount, easy implementation, and increase generation speed Effect

Inactive Publication Date: 2013-05-08
北京广讯科技有限责任公司
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Problems solved by technology

It can be seen that the existing method of constructing the multiplier matrix has a large amount

Method used

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  • Generating device and method of constant coefficient matrix in reed-solomon (RS) code of China mobile multimedia broadcasting (CMMB) system
  • Generating device and method of constant coefficient matrix in reed-solomon (RS) code of China mobile multimedia broadcasting (CMMB) system
  • Generating device and method of constant coefficient matrix in reed-solomon (RS) code of China mobile multimedia broadcasting (CMMB) system

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Embodiment Construction

[0015] 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.

[0016] The calculations in the RS encoder are all done in the Galois field, and the Galois field GF(2 m ) in any element Q can use the basis {1,α,…,α m-1}={γ 0 ,γ 1 ,...,γ m-1}, we call this basis a canonical basis. Usually with {γ 0 ,γ 1 ,..., m-1} to represent GF(2 m ) on the canonical basis. If another set of basis {τ 0 ,τ 1 ,...,τ m-1}Satisfy:

[0017] Tr ( γ i τ j ) = δ ( i , j ) = 1 i = j ...

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Abstract

The invention provides a generating scheme of a constant coefficient matrix in a reed-solomon (RS) code of a China mobile multimedia broadcasting (CMMB) system. The generating scheme is characterized in that the generating device of the constant coefficient matrix of the RS code of the CMMB system mainly consists of six parts of a controller, a domain element binary representation lookup table, a base transfer matrix storage, an anti-base transfer matrix storage, a multiplication unit and a storage unit. According to the generating device of the constant coefficient matrix in the RS code of CMMB system, 574 times of multiplication and 4998 times of addition are removed and the 574 times of the multiplication and the 4998 times of the addition are involved in multiplier matrix construction. In terms of each generator polynomial coefficient, binary representation of corresponding 8 domain elements only need taking out from the domain element binary representation lookup table to construct a multiplier matrix of each generator polynomial coefficient, and then a constant coefficient matrix of each generator polynomial coefficient is generated. The generating device of the constant coefficient matrix in the RS code of CMMB system is low in calculated amount, easy to achieve and capable of improving the generation speed of the constant coefficient matrix obviously.

Description

technical field [0001] The invention relates to China Mobile Multimedia Broadcasting (CMMB) technology, in particular to a method for generating a constant coefficient matrix in CMMB system RS coding. Background technique [0002] Reed-Solomon (Reed-Solomon, RS) code is a kind of multi-ary BCH code with strong error correction ability. It can correct both random and burst errors. In modern communication systems has been widely applied. [0003] The CMMB system adopts concatenated codes, the inner code is LDPC code, and the outer code is finite field GF(2 8 ) on (240,k) systematically shortened RS codes. The RS code length is always n=240 bytes, and there are 4 kinds of code rates, namely k=240, k=224, k=192, k=176. It should be pointed out that the RS (240, 240) code does not need to be encoded, and actually only needs to process the encoding of the other three code rate RS codes. figure 1 The generator polynomial coefficients g of RS codes under these three code rates a...

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Application Information

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IPC IPC(8): H04L1/00
Inventor 张鹏刘晋周德扬林子良刘蕾
Owner 北京广讯科技有限责任公司
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