基于直接提取载波技术的平方环设计  

Design of Squaring Loop Based on Direct Carrier Extraction

作　　者：吕鑫宇[1] 姚远程[1] 谭清怡 邹腾剑[1] 

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]四川九洲电器集团有限责任公司,四川绵阳621000

出　　处：《现代电子技术》2010年第1期189-192,共4页Modern Electronics Technique

基　　金：国家自然科学基金联合资助基金项目(10876035)

摘　　要：在采用相位调制的软件无线电接收机中,载波恢复电路起到了关键性作用。研究一种用于通信的载波同步平方环电路,在传统平方环的基础上,增加了一个乘法器,当用FPGA实现数控振荡器(NCO)时,利用输出的正余弦波完全正交的特点,将平方环的频率直接锁定在载波频率上,省去了二分频电路。阐明了其工作的基本原理和设计思想,并给出了在Simulink环境下的结构框图以及仿真波形。通过这样的改进,平方环载波提取电路更为简单,由于锁定频率即为载波频率,因此能够应用于输入信号载波频率更高的环境中,具有更广泛的应用价值。Carrier recovery is a vital part for the phase modulation software defined radio receiver. A squaring loop added a multiplier is proposed for the carrier synchronization in communication based on the traditional squaring loop. When the Numerical Controlled Oscillator（NCO） is realized on FPGA, frequency of the squaring loop could be directly locked at the carrier frequency without two divided - frequency treatment by using the orthogonal property of sine wave. Then,the working principle and design idea are provided,the structure diagram and simulation waves in Simulink are given. Finally, the squaring loop carrier extraction has more extensive application value because it has more brief circuit and it can be used in a higher frequency than the tradition one.

关 键 词：锁相环 载波提取 数控振荡器 环路滤波器 SIMULINK 

分 类 号：TN911.8[电子电信—通信与信息系统]