高围长结构化LDPC码的构造方法

Construction method of structured LDPC code with large girth

提出了一种高围长结构化低密度校验码的构造方法。首先介绍了以准循环技术为基础的高围长结构化规则LDPC码的构造方法,并在此基础上构造了重复累加结构的准规则LDPC码和非规则LDPC码。仿真结果表明,用这种方法构造的规则码和非规则码都具有优良的性能,特别是非规则码的性能优于DVB-S2的非规则码。并且采用该构造方法可以构造各种码长和码率的LDPC码,适应不同领域的应用。

A construction method of structured low-density parity-check（LDPC）code with large girth based on quasi-cyclic technique is proposed. And then the method to construct quasi regular repeat accumulate（RA） LDPC code and irregular RA （IRA） LDPC code is also presented. Simulation results show that they have excellent per[ormance, especially the IRA code performs better than the irregular LDPC code of DVB-S2. Further more, these codes have flexible block length and code rate, and may be used in various areas.