基于VHDL语言的HDB3码的编码和译码.doc

1、摘 要伴随着集成电路技术的发展，电子设计自动化(EDA)逐渐成为重要的设计手段，已经广泛应用于模拟与数字电路系统等许多领域。EDA的一个重要特征就是使用硬件描述语言(VHDL)来完成设计文件。诞生于1982年的VHDL语言是经IEEE确认的标准硬件描述语言，在电子设计领域受到了广泛的接受。数字基带信号的要求主要有两点，第一是对各种代码的要求，期望将原始信息符号编制成适合于传输用的码型；第二则是对所选的码型的波形的要求，期望波形适宜于在信道中传输。HDB3编码是数字基带信号传输中常用的传输码型，因其具有无直流成分，低频成分少和连零位数目最多不超过三个等明显的优点，对时钟信号的恢复十分有利而成为普

2、遍使用的基带传输码之一。本设计是在Quartus II开发环境下采用VHDL语言的，设计HDB3编码器和译码器。根据编码规则将译码器分为三个部分：插V模块、插B模块、单极性变双极性模块。根据译码规则，译码器只包含一个模块。最后，对每个模块进行仿真，实现相应功能后再进行整体仿真。关键词 HDB3 VHDL 编码 译码IAbstractThe Electronic Design Automation (EDA) technology has become an important design method of analog and digital circuit system growing.

3、 One important characteristic of the EDA As is the integrated circuit one of the standard description languages validated by IEEE， which was firstly introduced in 1982. And it was widely used by electronic designer now.The requirements of digital baseband signals are two points, The first is the req

4、uirement of various code, expected the preparation of the original information symbols used to pattern in a form suitable for transmission; The second is the requirements of the pattern of the selected waveform, expected waveform suitable for transmission in the channel.The HDB3 coding scheme is com

5、monly used in digital baseband transmission .The HDB3 code ，which has features of zero DC bias via alternating positive-negative voltage level bit by bit and no more than three continuous-zero bits ， deduces the power dissipation and makes the receiving device easy to recover the clock in the transm

6、itted code stream .so my major content of graduated design is designing based on the HDB3 volume/decoder of VHDL language， the requirement that it will reach is the basic skill that can realize HDB3 volume/decoder function in software can， and can coordinate entire design， make sure it reach the req

7、uirement that anticipated. This design in Quartus II development environment uses VHDL language to design HDB3 encoder and decoder. According to the encoding rules, there are three parts in decoder: insert the module V, insert the module B, the unipolar variable bipolar module.According to the decod

8、ing rules, decoder contains only one module. Finally, the simulation of each module, it achieve the corresponding function and then achieve the whole simulation.Key words VHDL HDB3 Encoding Decoding38目 录摘 要IAbstractII第1章 绪论11.1 研究目的和意义11.2 基带传输码型简介21.2.1 AMI码21.2.2 数字双相码21.2.3 NRZ码31.3 VHDL语言简介31.3.

9、1 VHDL定义31.3.2 功能和特征41.3.3 应用优点41.4 Quartus简介41.4.1 Quartus II的产生与发展41.5 本设计的研究内容6第2章 HDB3码的编/译码的规则72.1 HDB3码简介72.1.1 HDB3码定义72.1.2 HDB3码特点72.2 HDB3码编解码器的国内外发展情况82.3 HDB3码的应用92.3.1 HDB3码测井电缆遥传系统中的应用92.3.2 HDB3码高速长距离通信92.3.3 HDB3码在基带数据传输中的应用102.4 HDB3码的编码规则102.5 HDB3码的译码规则102.6 本章小结11第3章 HDB3码编码器的建模与

10、实现123.1 插V模块的建模与实现123.1.1 设计思路123.1.2 程序设计133.1.3仿真结果143.2 插B模块的建模与实现153.2.1设计思路163.2.2程序设计173.2.3仿真结果193.3单极性变双极性的建模与实现203.3.1设计思路203.3.2程序设计213.3.3仿真波形223.4编码器的仿真233.5本章小结24第4章 HDB3译码器设计264.1 设计思路264.2程序设计274.3译码器的仿真274.4本章小结28结 论30致 谢31参考文献32附录133附录237CONTENTSAbstract（Chinese）IAbstractIIChapter 1

11、 Introduction11.1 The Purpose And Significance Of The Research11.2 The Introduction Of Baseband And Transmission Code21.2.1 AMI Code21.2.2 Digital Phase Code21.2.3 NRZ Code31.3 VHDL Introduction31.3.1 VHDL defined31.3.2 Functions and features41.3.3 Application Advantages41.4 QUARTUS Introduction41.4

12、.1 Production And Development Of Quartus41.5 The Content Of The Design6Chapter 2 The Rules Of HDB3 Code Encoding/Decoding72.1 Introduction Of The HDB3 Code72.1.1 HDB3 Code Definition72.1.2 HDB3 Code Features72.2 HDB3 Code Codec Development At home And Abroad82.3 Applications Of The HDB3 Code92.3.1 A

13、pplications of HDB3 Code Logging Cable Telemetry System92.3.2 HDB3 Code High-speed Long Distance Communications92.3.3 Applications Of HDB3 Code In The Base-band Transmission102.4 Encoding Rules Of HDB3 Code102.5 Decoding Rules Of Hdb3 Code102.6 Chapter Summary11Chapter 3 The modeling And Implementat

14、ion Of HDB3 Encoder123.1 Inserted Modeling And Implementation Of the Module V123.1.1 The Design Ideas123.1.2 The Programming133.1.3 The Simulation Results143.2 Inserted Modeling And Implementation Of The Module B153.2.1 Design Ideas163.2.2 Programming173.2.3 Simulation Results193.3 Into a Bipolar Un

15、ipolar Modeling And Implementation203.3.1 The Design Ideas203.3.2 The Programming213.3.3 The Simulation Results223.4 Encoder Simulation233.5 Chapter Summary24Chapter 4 The design of HDB3 Decoder264.1 The Design Concept264.2 The Programming274.3 Decoder Simulation274.4 Chapter Summary28Conclusions30Acknowledgements31References32Appendix 133Appendix 237第1章 绪论数字通信的主要特点：抗干扰能力强，尤其是数字信号通过中继再生后可消除噪声积累；数字