摘要
介绍了平方变换法相干解调原理,从工程角度完善了载波提取的电路结构,消除了频移载波的误锁问题。提出用相对相移平方锁相环法来实现从2DPSK信号中提取相干载波,解决了提取的载波信号存在180°的相位含糊问题,为通信系统提高抗噪性能提供了条件,并用Simulink设计出锁相环法提取载波的仿真电路图和进行相应的仿真实验。
Theory of coherent demodulation based on method of square counterchange is introduced. The structure of circuit for cartier recovery is perfected in engineering, and the problem of error-lock for frequency-shift carrier is eliminated. Square PLL is lodged to achieve coherent carrier from 2DPSK signal. The 180° phase＇s inexplicit problem which exist in carrier recovery is resolved. The resisting noise property of communication system is improved. We scheme out emulational circuit diagram for carrier distilling with PLL by using simulink and process corresponding emulational experiment.
出处
《计算机工程与设计》
CSCD
北大核心
2009年第15期3547-3549,共3页
Computer Engineering and Design
基金
广西教育厅科研基金项目(200707LX196)
广西工学院自然科学基金项目(院科自0704102)
