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总览 评价 周杨兆 1, , 蒋学芹 2,* ( 1、 东华大学信息学院; 2、 东华大学信息学院2; ) 摘要: 众所周知,progressiveedge-growth(PEG)算法可以用来构造low-density parity-check(LDPC)码的校验矩阵,并且这样的矩阵拥有很大的围长。在文献1中,作者
周杨兆1,, 蒋学芹2,*
(
1、东华大学信息学院; 2、东华大学信息学院2; )
摘要:
众所周知,progressiveedge-growth(PEG)算法可以用来构造low-density parity-check(LDPC)码的校验矩阵,并且这样的矩阵拥有很大的围长。在文献1中,作者提出了在中继通信系统中的一种LDPC码,码率兼容的root-LDPC码(RCR-LDPC码),这种LDPC码是基于扩展root-LDPC得到的。然而,对应RCR-LDPC码的校验矩阵是由几个子矩阵组成的,所以它的围长并不是最优的。为了解决这个问题,这篇论文提出了改进的PEG算法,从整体上去构造校验矩阵,使得它的围长尽可能地大。仿真结果证实,使用改进的PEG构造的LDPC码误帧率(FER)优于文献1中构造的LDPC码。
关键词:
LDPC码,PEG算法,中继通信
ZHOU Yangzhao, JIANG Xueqing*
(
School of Information Science and Technology, Donghua University, Shanghai 201620; )
Abstract:
In this paper, the progressive edge-growth (PEG) algorithmcan be used to construct low-density parity-check (LDPC)codes at finite code lengths with large girths through the establishmentof edges between variable and check nodes in an edge-by-edgemanner. In [1], the authors derived a class of LDPC codes forrelay communication systems by extending the full-diversity root-LDPC code. However, the submatrices of the parity-check matrixH corresponding to this code were constructed separately; thus, thegirth of H was not optimized. To solve this problem, this paper proposesa modified PEG algorithm for use in the design of large girthand full-diversity LDPC codes. Simulation results indicated thatthe LDPC codes constructed using the modified PEG algorithm exhibiteda more favorable frame error rate performance than didcodes proposed in [1] over block-fading channels.
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