数字Costas环在FPGA中的实现  

Implementation of Digital Costas Loop on FPGA Platform

作　　者：封小钰[1] 鄢文飞[1] 刘必刚[1] 

机构地区：[1]武汉理工大学信息工程学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2010年第4期831-833,837,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：Costas环是一种闭环自动调整系统,常用于抑制载波的相位调制系统中提取参考载波信号.文中介绍了Costas环的基本原理,提出了一种用CIC滤波器代替环路滤波器的方法,并根据该原理用matlab的simulink工具箱对costas环进行了建模和仿真,最后在Quartus II+ModelSim环境中用Verilog语言实现了该算法,并下载到软件无线电硬件电路中验证了该算法的正确性.仿真和实验结果表明,该Costas环路具有十分优良的性能.Costas loop is a closed self-adjusting system,usually used to extract reference carrier in suppressed carrier phasemodulated systems.In this paper,the basic principle is introduced,a CIC filter is presented to replace the loop filter,and base on this principle,the Costas loop is modeled and simulated by the simulink toolbox of matlab.Finally,in Quartus II＋ ModelSim environment,using Verilog language the algorithm is implemented,and downloaded to the software radio hardware circuits to validate the correctness of the algorithm.Simulation and experimental results show that high performance can be achieved using this kind of all-digital Costas loop.

关 键 词：COSTAS环 VCO压控振荡器 CIC滤波器 

分 类 号：TP802[自动化与计算机技术—检测技术与自动化装置]