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文中分析了重复累积(RA)码的结构特点以及编码过程,设计了一种采用旋转结构的重复累积码。该码具有低密度码的特点和优点,同时具有旋转结构,编码简单,译码方便,易于调整码率,易于硬件实现等特点。文中给出了由置换子矩阵的索引确定交织序列的算法。仿真结果表明,长度适合的RA码误码性与通过复杂方法构造出来的码字性能接近。
In this paper, the structural characteristics and encoding process of repetitive accumulation (RA) codes are analyzed, and a repetitive accumulation code with rotating structure is designed. The code has the characteristics and advantages of low-density code, while having a rotating structure, encoding simple, easy decoding, easy to adjust the code rate, easy to implement the characteristics of the hardware. In this paper, an algorithm for determining the interleaving sequence from the indices of permutation submatrices is given. The simulation results show that the error-tolerant RA codes with suitable length are close to the code words constructed by the complex method.