QPSK调制信号的同步载波提取  

Synchronous carrier extraction of QPSK modulated signal

作　　者：张小莉[1] 樊延虎[1] 

机构地区：[1]延安大学物理与电子工程学院,陕西延安716000

出　　处：《现代电子技术》2015年第3期54-56,共3页Modern Electronics Technique

摘　　要：为了在QPSK数字调制系统中恢复QPSK的载波同步信号,以确保接收机能够接收到无失真的数据,在对QPSK调制理论阐述后提出基于DDS的平方环直接提取载波的方法,分析了电路中各个部分的作用和功能,用Matlab软件进行仿真实验,对锁相环提取的载波信号进行分析,在锁相环性能良好的前提下,实现了载波信号的提取。利用Verilog HDL语言对硬件电路进行行为级描述,综合出RTL级电路。In order to restore the QPSK Carrier synchronization signals in the QPSK digital modulation system and ensure that the receiver can receive data without distortion,QPSK modulation theory is described and the DDSbased method that the carrier is directly extracted by the square ring is proposed. The role and function of each part of the circuit are analyzed. Matlab software was used in the simulation experiment to analysis the carrier signal extracted by phaselocked loop. In a premise to maintain good performance of the phaselocked loop,the extraction of the carrier signal was achieved. The behavioral level description of hardware circuits is performed with Verilog HDL. The RTL-level circuit was obtained by synthetical method.

关 键 词：QPSK 载波同步 DDS 调制信号 

分 类 号：TN914.42[电子电信—通信与信息系统]