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LDPC码是一种具有优秀纠错性能的信道编码方式,已成为第四代通信系统强有力的竞争者.Gallager提出的正则LDPC码中由于编码中短长度圈的存在,编码性能会在某种程度上降低.研究了Tanner图中的短环对编码性能的影响,在Gallager构造方法的基础上,提出一种可抑制长度为4的短环的软件构造方法,通过半随机的方法构造各行位置向量,并检验是否存在长度为4的短环,给出了算法的软件流程图,仿真结果表明:抑制短环的软件方法构造的LDPC码,其误码性能和Gallager构造法相比,误码性能得到了很好的改善.
LDPC code is a channel coding method with excellent error correction performance and has become a strong competitor of the fourth generation communication system.Gallager’s regular LDPC code due to the existence of short and medium length encoding, encoding performance will be in a On the basis of Gallager’s construction method, a software construction method that can restrain the short loop of length 4 is proposed, and the position of each row is constructed by a semi-random method Vector and checking whether there is a short loop with length of 4. The software flow chart of the algorithm is given. The simulation results show that compared with the Gallager method, the error performance of LDPC codes constructed by the software method of suppressing short loop Got a good improvement.