基于FPGA的HDB_3码编译码器的设计

CIRCUIT DESIGN OF HDB3 BASED ON FPGA

在实际的数字基带通信系统中,为使信息在基带信道中顺利传输,必须选择合适的基带信号,HDB3基带信号是常选信号之一。针对数字基带传输系统中HDB3信号的特点,采用基于FPGA的VHDL语言,在QuartusⅡ的环境中,实现HDB3数字基带信号的编码、译码器。本文主要分析NRZ(单极性不归零码)码与HDB3码(三阶高密度双极性码)之间的转换原理,并介绍用FPGA(现场可编程阵列)完成编译码器的设计思路。

In the actual number of base-band communication system,In order to smoothly transfer the information in the base-band channel,we must choose the right base-band signal.HDB3 signal baseband signal is one of a long election.Digital base-band signal transmission system characterized by HDB3.In the Quartus II environment,based on f ield-programmable array of VHDL language,the realization of code and decode of the digital base-band signal HDB3.In this paper,the main principles of analysis of the conversion between the NRZ code（non-unipolar NRZ） and the HDB3 code（third-order highdensity bipolar code）,and introduced by FPGA（Field Programmable Array） to complete the idea of code design.