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Quasi-cyclic LDPC serial encoder based on ring shift left

An LDPC code and serial encoder technology, applied in the field of channel coding, can solve the problems of high cost and high power consumption, and achieve the effects of simple structure, reduced power consumption and cost saving

Inactive Publication Date: 2013-08-14
RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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Problems solved by technology

[0012] The existing implementation scheme of QC-LDPC serial encoding in the communication system has the disadvantages of large power consumption and high cost. To solve these technical problems, the present invention provides a serial encoder based on cyclic left shift

Method used

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  • Quasi-cyclic LDPC serial encoder based on ring shift left
  • Quasi-cyclic LDPC serial encoder based on ring shift left
  • Quasi-cyclic LDPC serial encoder based on ring shift left

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Embodiment Construction

[0020] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0021] Since the generator polynomial g of the circulant matrix i,j Rotating right n bits is equivalent to rotating it left b-n bits, ie Then equation (3) can be rewritten as

[0022] s i G i , j = e i × b g i , j l ( b ) + e i...

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Abstract

The invention provides a quasi-cyclic LDPC serial encoder based on ring shift left, which includes c generator polynomial lookup tables of all cyclic matrix generator polynomials in a prestored generated matrix, c b-bit binary multipliers for performing scalar multiplication to information bit and generator polynomials, c b-bit binary adders for performing modulo-2 adding to product and content of shifting registers, and c b-bit shifting registers for storing the sum of ring shift left for 1 bit, and finally, the checking data is stored in the c shifting registers. The serial encoder provided by the invention has the advantages of few registers, simple structure, low power consumption, low cost and the like.

Description

technical field [0001] The invention relates to the field of channel coding, in particular to a serial coder of a quasi-cyclic LDPC code in a communication system. Background technique [0002] Low-Density Parity-Check (LDPC) code is one of the efficient channel coding techniques, and quasi-cyclic LDPC (Quasic-LDPC, QC-LDPC) code is a special LDPC code. Both the generation matrix G and the check matrix H of the QC-LDPC code are arrays composed of cyclic matrices, which have the characteristics of segmental circulation, so they are called quasi-cyclic LDPC codes. The first row of the circulant matrix is ​​the result of the cyclic right shift of the last row by 1 bit, and the remaining rows are the result of the cyclic right shift of the previous row by 1 bit. Therefore, the circulant matrix is ​​completely characterized by its first row. Usually, the first row of a circulant matrix is ​​called its generator polynomial. [0003] The communication system usually adopts the QC...

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Application Information

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IPC IPC(8): H03M13/11
CPCH03M13/611H03M13/116
Inventor 张鹏刘志文张燕
Owner RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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