可分解的RC-LDPC码以及HARQ的设计

Design of Decomposable-Rate-Compatible LDPC Codes and HARQ Scheme

该文提出了一种可分解的码率兼容LDPC码的构造方法,该方法构造所得到的一个高码率LDPC码的校验矩阵中包含有若干低码率LDPC码的校验矩阵,而且一个高码率的LDPC码又可以分解成多个性能优异的低码率的LDPC码进行编译码;结合该特性设计了一种基于可分解的码率兼容LDPC码的混合自动重传方案。与普通的ARQ方案相比,该重传方案不单能够通过重传获得更多的信息,而且能够通过降低纠错码的码率来提高纠错码的性能。仿真结果表明,当所采用LDPC码的码长为2000左右,码率为1/2和2/3时,与一般的ARQ相比,该方案的误帧率以及吞吐量(小于0.5的时候)均能获得近1.5dB的增益。

A novel method is proposed to construct Decomposable-Rate-Compatible LDPC （D-RC-LDPC） codes. The H matrix of a high rate LDPC codes constructed by this method contains a series of LDPC codes with low rate The low rate codes can be encoded and decoded respectively which make the system more flexible. A new HARQ scheme based on D-RC-LDPC is also proposed, which is called DB-HARQ （D-RC-LDPC Based HARQ）. It can transmit more information through re-transmit scheme and improve the performance of Error Correction Code （ECC） by lowering rate of the ECC. The scheme can improve the FER and throughput performance with 1.5 dB compared with normal ARQ scheme when the code length of is about 2000 and the code rate is 1/2 to 2/3.