本项目聚焦于利用FPGA技术开发高效能的HDB3码编码器，旨在验证其在数据传输中的抗误码性能及实际应用价值。
摘 要 HDB3码是基带传输码型之一。由于它具有无直流分量、低频成分少以及连续“0”不超过三个的特点，因此有利于信号的恢复和检验，在井下电缆遥传系统及高速长距离通信中广泛应用。FPGA器件因其低成本、高可靠性、短开发周期和可重复编程等特点而备受青睐。利用EDA技术可以实现硬件设计软件化，从而加速数字系统的构建并降低设计成本。本段落首先简述了HDB3码、FPGA技术和EDA技术的发展背景，并介绍了常用的VHDL语言及其在电路设计中的应用方法。接着详细描述了HDB3编码与译码的原理及特点，重点分析了其编译规则的具体实现方式，以VHDL为主要工具对编码器和译码器的设计进行了说明并提供了具体设计方案、程序流程图以及仿真结果分析，证明方案的有效性。最后完成了曼彻斯特码编码器与译码器设计，并进行对比学习。
关键词：HDB3码；FPGA；EDA; VHDL; 曼彻斯特码；编译解
Abstract HDB3 code is one of the baseband transmission codes. It has no DC components, few low-frequency components, and continuous zeros not more than three. These features facilitate signal recovery and error checking, making it commonly used in underground cable remote transmission systems and high-speed long-distance communication systems. FPGA devices are favored for their cost-effectiveness, reliability, short design cycles, and reprogrammability. EDA technology enables hardware designs to be implemented using software, thus accelerating the construction of digital systems and reducing design costs. This paper first introduces the development background of HDB3 code, FPGA technology, and EDA technology. It then elaborates on VHDL language commonly used in circuit design entry with a summary of methods for designing circuits using VHDL. The article details the principles and characteristics of HDB3 encoding and decoding rules, focusing specifically on their implementation methodologies. Using VHDL as the primary tool, it describes the designs of encoders and decoders, providing specific plan proposals, software design flowcharts, simulation results analysis to prove the validity of these plans. Finally, Manchester encoder and decoder designs are completed for comparative study.
Keywords: HDB3 code; FPGA ; EDA ; VHDL; Manchester code; Encoder and Decoder
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