一种基于Simulink的Turbo码仿真实现

Implementation of Turbo Code Simulation Based on Simulink

摘要: 介绍了Turbo码的编解码原理，并且提出了一种完全基于Simulink模块的Turbo码仿真模型。编码器采用两个相同的分量编码器通过交织器并行级联而成。译码器采用迭代译码方式，由Simulink模型库中的最大后验概率译码模块(A Posteriori Probability Decoder)构成，极大的简化了译码器的复杂性。通过仿真，分析了迭代次数、交织长度、译码算法对译码性能的影响。对实际的系统设计有一定的参考价值。

Abstract: This paper describes the basic structure of Turbo code scheme, and presents a Simulink model of a Turbo encoder and decoder. Turbo encoder concatenates two same sub-encoders in parallel through interleaver. The iteration decoder is based on APP (A Posteriori Probability) decoder block in Simulink, so the process of coding becomes convenient and vivid. Then, based on the simulation we made, some main factors (such as interleaver length, iteration times, decoding algorithm) which will affect the performance of Turbo codes are studied, and the corresponding emulation results and the analysis are given. It has some reference value to the actual system design.