【作者】 柯海英；

【导师】 许洪光；

【作者基本信息】 哈尔滨工业大学 ， 通信与信息工程， 2008， 硕士

【摘要】 由于通信信道固有的噪声和衰落特性,加上存储媒介的缺陷等原因,以及新的通信业务和信息业务的不断涌现,用户对信息传输的质量要求和速率要求不断提高。信道编码提高了信息传输的可靠性,但是常用的信道编码理论对于UWB系统还未有充分的探讨。本课题研究的目的在于通过信道纠错码中的级联码仿真试验,为UWB信道纠错码提供试验和实践依据,为考察UWB通信系统的信道编码纠错能力提供参考依据。本文通过在QuartusII软件上进行级联纠错码的编写和仿真,编写了级联码的编解码程序(卷积码+交织+RS码),并加以仿真,测试了单独的RS码纠错能力和级联码纠错能力(卷积码+交织+RS码),仿真和分析了二者之间的差距,给出实际UWB系统中级联纠错的方法。本文的研究内容主要包括以下几个方面:(1)采用横向对比方法,分析UWB系统和DVB-T、DVB-D,建立系统分析模型,并研究诸模型的异同。(2)研究卷积码,采用维特比Viterbi译码方法设计,纠随机错误能力,满足了译码设备简单的需求。(3)通过设计交织和解交织,解决集群出错问题。(4)根据RS码特性,分析突发性错误纠错方法,给出RS码编译码方法。本文中由实验和仿真得到的结论反映了信道编码中的级联纠错码的实际模型和应用特性,为信道纠错码在复杂UWB系统中的进一步应用提供了理论基础;RS码与卷积码和交织技术并联组合的纠错方法对降低信道编码的错误率、提高纠错能力、满足通信需要具有一定的参考价值。更多还原

【Abstract】 As a result of the inherent noise and the fading feature, added to shortcomings of the storage media, as well as the appearances of the new communication service and new information business, clients require better more quality for information transmission service and transmission rate. The channel coding improves the reliability for the code transmission procedure, meanwhile the tranditional code theory provides inadequate study and evidence for the UWB communication system.This thesis aims at establishing an practical FEC model for the Cchannel coding through experiments and simulations, supply a reliable basid for UWB。This thesis includes some basic contents, which contain the edition and simulation of the source code for the Cascade Code, to design the RS code, interleaver technology and convolution code separately, meanwhile simulate them, test the ability of error correction for the RS Code and Cascade Code independently, and furtherly more analysize the difference between them, provide the actural solution of the cascade for the UWB system. This paper mainly concentrates on the following aspects:(1) A crossive comparision of UWB, DVB-T and DVB-D, to set up their models, and to study the difference among them.(2) To meeting the application cases, charging methods and efficiency of supercapacitors are discussed in the thesis. The charging speed and safety problems are solved by designing a high current constant-current power supply device.(3) Designing the Interleaver and Deinterleaver code, to solve the mass error.(4) Depending on the characteristics of the RS code, to analyze the sudden errors, supply the measures of the RS encoding and decoding.The conclusions in this thesis drawn from experiments and simulations indicate the properties of their actual model and the rules of the their applications, supply the improved theory foundation for more use. The Error-Correction methond, that is the Reed-Solomn Code, combined with the Convolution Code and interleave technology, is an appropriate selection to decrease the error rate of channel code and improve the ability of correcting, also has some valuable reference for them.更多还原