基于生成矩阵的LDPC/Turbo码的构造及内外迭代译码新技术

提出了一种新的LDPC／Turbo码（简称L／T码），及采用内外迭代译码新技术的简便实用的译码器。L／T码将原来Turbo编码中的两个子编码器分别用RSC码和LDPC码来代替，并由一个交织器连接。解码采用软输入／软输出的最大后验概率算法迭代执行，利用外信息的传递，每个子译码器都可以充分利用另一个在上一步计算中得到的结果。仿真在加性白高斯信道下进行，并将其结果和传统方法进行了比较。

A New Method for Construction of LDPC/Turbo Codes Based on Generator Matrix and Internal/External Iterative Decoding

A new code with an original parallel organization of Recursive Systematic Convolutional(RSC) and Low-Density Parity-Check(LDPC) code is presented,which is called "L/T" code.A simple and useful decoder adopting a new technique with both internal and external iterative processing is also pvesented.Similar to Turbo codes,the two elementary encoders are linked together by a nonuniform interleaving.Decoder employs iterative processing in which each component decoder takes advantage of the work of the other at the previous step,with the aid of the original concept of extrinsic information.The simulation results are obtained over AWGN channel,and are also compared with those obtained by the traditional approach.