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    • 43. 发明公开
    • Method and apparatus for channel encoding and decoding in a communication system using low-density parity-check codes
    • 方法以及使用低密度奇偶校验码用于在通信系统中的信道编码和解码设备
    • EP2546995A1
    • 2013-01-16
    • EP12188162.7
    • 2009-02-11
    • Samsung Electronics Co., Ltd
    • Myung, SehoKwon, Hwan-JoonKim, Jae-YoelLim, Yeon-JuYun, Sung-RyulLee, Hak-JuJeong, Hong-Sil
    • H03M13/11H04L1/00
    • H03M13/6362H03M13/1165H03M13/1188H03M13/618H04L1/0057H04L1/0069
    • An apparatus and a method for channel decoding using a Low-Density Parity-Check (LDPC) code, the method comprising:
      demodulating a signal transmitted from a transmitter;
      determining position information of the punctured parity bits by estimating information about a predetermined order of parity bit sets to be punctured and the number of parity bit sets ; and
      decoding data using the position information of the punctured parity bits,
      wherein determining position of punctured parity bits comprises,
      determining a number of parity bits to be punctured; and
      determining a number of parity bit sets to be punctured based on the determined number of parity bits to be punctured; and
      acquiring a predetermined order of parity bit sets,
      wherein the predetermined order of parity bit sets is determined as 27, 13, 29, 32, 5, 0, 11, 21, 33, 20, 25, 28, 18, 35, 8, 3, 9, 31, 22, 24, 7, 14, 17, 4, 2, 26, 16, 34, 19, 10, 12, 23, 1, 6, 30, 15..
    • 的装置和信道使用低密度奇偶校验解码(LDPC)码,所述方法包括以下步骤:解调从发射机的信号反式mitted; 通过估计关于奇偶校验位的预定顺序信息的删余奇偶性比特的确定性采矿位置信息设置为被打孔和奇偶校验位集合的数量; 和使用被删余奇偶性比特,worin删余奇偶性的确定性采矿位置位包含的位置信息数据进行解码的,确定性的挖掘被打孔了的数的奇偶校验位; 和确定性采矿一些奇偶校验位的设置基于确定性开采数的奇偶校验位的要打孔的要打孔; 和获取的奇偶校验位集合的预定顺序,worin的奇偶校验位集合的预定顺序被确定为27,13,29,32,5,0,11,21,33,20,25,28,18,35,8 ,3,9,31,22,24,7,14,17,4,2,26,16,34,19,10,12,23,1,6,30,15 ..
    • 48. 发明公开
    • Method for pseudo-puncturing exponent matrixes of LDPC codes to comply with different code-rates
    • Verfahren zum Pseudopunktieren von Exponentenmatrizen von LDPC-Codes um unterschiedlichen Coderaten zugenügen
    • EP2285004A1
    • 2011-02-16
    • EP09165350.1
    • 2009-07-13
    • Nokia Siemens Networks Oy
    • Cannalire, Giacomo Francesco
    • H03M13/11
    • H03M13/116H03M13/1185H03M13/1188H03M13/6393H03M13/6544
    • Pseudo-puncturing exponent matrixes of Low Density Parity Check (LDPC) block codes, to meet with increasing code-rates, could be used in networks compliant with fixed and mobile Broadband Wireless Access Networks of standard IEEE 802.16e (WiMAX). Puncturing is performed starting from a base model (mother) exponent table sized ( r b ,n b ) that structures the longest codeword n 0 divided by the highest spreading factor Z 0 ' thus giving rise to the lowest code-rate R 0 . The mother exponent table is built according to semi-random techniques, as for example the one shown in IEEE 802.16e (encoding Method 2). For puncturing purpose, a variable positive integer x is set such that the minimum number of rows r x = r b - x of the mother exponent table, corresponding to the higher code-rate R x -max , is greater than or equal to the average column weight to have an LDPC code with good performances. Sub-tables for generic code-rates R x are obtained by deleting from the mother exponent table the x columns and the x rows of the highest indexes. Before deleting, the first column vector of the deterministic part of the mother exponent table shall be adapted to be compliant with the standard requirements of each code-rate R x . The final pseudo-punctured matrix for a code-rate R x is obtained by masking the relevant expanded sub-table with a specific seed matrix.
    • 针对标准IEEE 802.16e(WiMAX)的固定和移动宽带无线接入网络的网络,可以使用低密度奇偶校验(LDPC)块码的伪穿孔指数矩阵,以满足不断增加的码率。 从基本模型(母体)指数表开始进行穿刺,其大小(r b,n b),其构造最长码字n 0除以最高扩频因子Z 0',从而产生最低码率R 0。 母指数表根据半随机技术构建,例如IEEE 802.16e(编码方法2)中所示的指数表。 为了删截目的,设置可变正整数x,使得对应于较高码率R x -max的母指数表的最小行rx = rb-x大于或等于平均列 具有良好性能的LDPC码。 通过从母指数表中删除x列和最高索引的x行,获得通用代码率R x的子表。 在删除之前,母指数表的确定性部分的第一列向量应适应于符合每个码率R x的标准要求。 通过用特定种子矩阵掩蔽相关的扩展子表获得码率R x的最终伪穿孔矩阵。