【作者】 丁金鹏；

【导师】 温向明；

【作者基本信息】 北京邮电大学 ， 通信与信息系统， 2008， 硕士

【摘要】 TURBO码是第三代移动通信系统中使用信道编码的技术,对其编译码器的研究有着非常重要的意义。在系统的设计过程中,根据SCCC和PCCC的不同原理,搭建了各自相应的系统模型。并采用适当的模块分割,把整体系统的设计分解成对各个子模块的研究,并给出了相应的子模块仿真。最后通过对两个系统的仿真,获得了如下的结论:通过增加交织长度,选择好的交织器,采用合适的迭代系统卷积码(RSC)编码器结构,应用好的译码算法以及增加迭代次数可以获得性能优良的TURBO码。本论文的主要工作包括:1.首先简单介绍了TURBO码的提出,发展状况以及其应用价值。2.详细讨论了三类TURBO码(串行级联卷积码(SCCC),并行级联卷积码(PCCC)和混合级联卷积码(HCCC)的编码器与译码器结构,原理。3.论述了TURBO码编译码中的关键技术。并深入讨论了译码算法。4.在此基础上,用使用SIMULINK平台搭建了在AWGN信道下SCCC和PCCC的通信系统模型。5.统计了大量的仿真数据,绘制出相应不同参数条件下的SCCC和PCCC的性能曲线。从而得出影响SCCC和PCCC的性能的参数条件。并验证了TURBO码中的迭代循环译码,PCCC错误平层等理论。本设计应用MATLAB中的SIMULINK仿真工具对TURBO的性能做出了仿真,证明TURBO码具有较低误码率,具有很高的实用价值。更多还原

【Abstract】 TURBO code is the channel coding technology of the third generation mobile communication system , the study of its encoder and decoder have a very important significance.In the course of designing the system, Constitute respective system models according to the different principles of PCCC and SCCC using the method of appropriate module division. Simulate the sub modules in order to design the integer system and execute the simulations of the sub-modules. At last, by simulating the two systems, acquire the conclusions below: By increasing the length of interlleaving, choosing a good interle-rleaver, adopting a appropriate RSC encoder strcture, applying a outstanding decoding arithmetic and increasing the number of iteration can get a good performance TURBO codeThe primary contents of this thesis are:1. Elaborate the inventing, development status and the application value of TURBO code at first.2. Discuss the encoder and decoder structure and principle of three types of TURBO code (Serially Concatenated Convolutional Code (SCCC), Parallel Concatenated Convolutional Code (PCCC) and Hybrid Concatenated Convolutional Code (HCCC) detailedly.3. Dissertate the key technique in the encoding and decoding of TURBO code. Deep into discussing the decoding algorithm.4. Ground on the discussion above, establish two communication system models with SIMULINK which validate the performance of SCCC and PCCC in AWGN channel.5. Get a mass of statistics of the simulation and draw the performance curve of PCCC and SCCC in different parameter conditions. Consequently acquire the parameter conditions which affect the performance of PCCC and SCCC. And validate the basic theories of TURBO code such as iterative decoding and the PCCC error floor and so on.This design simulates the performance of TURBO code with SIMU-LINK in MATLAB and proves that TURBO code have low error rate , and have the high practical application value.更多还原