HDB3码编解码的电路设计毕业设计.doc
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哈尔滨工业大学本科毕业论文
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HDB3编译码电路的设计
[摘 要] 数字基带信号的传输是数字通信系统的一个重要组成部分,HDB3(三阶高密度双极性码)编码是数字基带信号传输中常用的传输码型。HDB3编码无直流成分且连0串符号最多只有3个。该种码型通过正负极性交替消除传输信号中的直流成分,降低功耗。文中基于VHDL设计了HDB3编码器,实现了编码过程中的插V及插B模块;通过插入正反极性电平信号解决了串行码元中连0多于4个时的情形。在MAX+PLUSⅡ工具中进行了仿真、调试,结果表明实现了HDB3编码功能,能实现基带信号在基带信道中直接传输与提取,同时能很好地提取定时信号。编译码器已通过硬件下载、测试,可用于实际电路中。此方法中由于CPLD可重复编程的特点,可对其进行在线修改,便于设备的调试和运行。
[关 键 词]HDB3编码; 编译码;VHDL;MAX+PLUSⅡ
[中图分类号] TN702 [文献标志码] A
The Design of HDB3 Encoding and Decoding Circuit
Abstract: The digital baseband signal transmission in digital communication systems are an important component of, HDB3 (third-order high-density bipolar code) are encoded digital baseband signal transmission used in the transmission pattern. HDB3 encoding non-DC components and even the string of symbols 0 and only a maximum of three. Pattern of the alternating polarity through positive and negative signal to eliminate transmission of DC components, reduced power consumption. Based on the VHDL design of a HDB3 encoder, the encoding process of implementation of the interpolation module V and Chap B; by the insertion of the positive and negative polarity signal level to solve the serial symbol 0 even when more than 4 cases. MAX + PLUS Ⅱ in the instrument in the simulation, debugging, results show that the implementation of the HDB3 coding function, can achieve base-band signal at base-band channel of direct transmission and extraction, while a good timing signal extraction. Had passed through the hardware codecs download, test, can be used in the actual circuit. This method because of CPLD can duplicate the characteristics of programming can be modified online, easy to debug and run the equipment.
Key words: HDB3 coding; codec; VHDL; MAX + PLUS Ⅱ
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