两种抑制载波双边带信号的载波提取方法比较

在介绍平方环和科斯塔斯环实现抑制载波双边带调制信号载波提取原理的基础上,基于Matlab中的Simulink组件,分别给出了两种方法进行该信号载波提取的具体过程,设置了合理的环路滤波器参数和VCO单元的控制灵敏度.通过仿真分析比较了两种方法的可行性和优缺点.结果表明,两种方法提取抑制载波双边带调制信号的载波是可行的,但科斯塔斯环法的抗噪声性能优于平方环法.

Comparison of Two Methods for Extracting Synchronization Carrier from Double Sideband Suppressed Carrier Signal

This paper introduces the basic principles of extracting synchronization carrier from double sideband suppressed carrier（DSB-SC） signal,which is based on square ring and costas loop.With the use of SIMULINK toolbox in MATLAB,the processes of these two methods about how to extract the carrier are detailed.After the detailed analysis,the parameters of loop filter and the VCO are provided.The simulation results not only validate the feasibility of these two methods but also show that the method based on costas loop has better noise performance than the method based on square ring.Finally,the paper analyzes and compares the advantages and disadvantages of these two methods.