LDPC码的有效编码算法研究

LDPC码编码结构中短环的存在，导致译码时的重复迭代，降低了译码性能。介绍了一种编码算法，该算法先通过Richardson和Urbanke提出的Efficient编码算法对LDPC码的校验矩阵优化，然后再主要研究其二分图中长度为4的短环，提出了一种校验矩阵H的消4-环算法。最终实现了降低编码的复杂度的同时，译码效率也得到提高。

Research on The Efficient Encoding Algorithm of LDPC

The existence of short circle in LDPC code structure causes the repetition iteration when decoding, which reduces the decoding performance. This article introduces a kind of code algo- rithm,firstly uses the efficient code algorithm which proposed by Richardson and Urbanke optimi- zes the LDPC code check matrix, then mainly studies the circle whose length is 4 in its bipartite graph, proposes a kind of algorithm cancels the 4-circle in the check matrixH, finally realizes reducing the encoding complexity,the decoding efficiency is enhanced at the same time.