QPSK扩频调制信号载波跟踪环路设计  

Design of Carrier Tracking Loop for QPSK Spread-Spectrum Balanced Modulation Signal

作　　者：裴军[1] 杜晓辉[1,2] 胡正群[1] 

机构地区：[1]中国科学院国家天文台,北京100012 [2]中国科学院研究生院,北京100039

出　　处：《电信科学》2010年第5期83-87,共5页Telecommunications Science

基　　金：国家重点基础研究发展计划("973"计划)基金资助项目(No.2007CB815504)

摘　　要：扩频接收基带通常需要载波跟踪环来完成本地载波与接收信号载波的同步,科斯塔斯环是常用的非相干载波相位跟踪环,具有较好的鉴相特性。本文基于常规的单路单载波解调的科斯塔斯环原理,对科斯塔斯环做了改进,提出了对双通道平衡QPSK扩频基带所用载波跟踪环科斯塔斯环的改进方法,并推导出环路误差鉴相信号,用Matlab进行了仿真实验,结果证明利用本环路可实现载波稳定跟踪。The carrier PLL is usually used for the signal synchronization between local generated carrier signal and received carrier signal. Costas loop is the commonly used non-coherent carrier PLL with well phase discrimination characteristic. This paper based on the principle of Costas loop used single channel carrier PLL designs a improved Costas loop which can be used by the carrier PLL for double channel balanced QPSK＋DSSS and deduces the error signal of phase discrimination signal, finally, the improved Costas loop is simulated principally, as result, it may realize stable tracking of carrier phase for double channel QPSK＋DSSS.

关 键 词：科斯塔斯环 QPSK解调 载波相位跟踪环 直接序列扩频 

分 类 号：TN929.5[电子电信—通信与信息系统]