摘要
OQPSK调制信号测试中传统基于科斯塔斯环的载波同步方法具有载波捕获时间长与入锁慢特点,不能满足实时分析测试的处理需求。针对该问题,该文采用基于离散傅里叶变换的载波频偏预估计与简化载波同步环路相结合的改进方法,实现OQPSK调制信号测试中载波相位的快速精确跟踪。研究表明,所提算法可以有效的减小捕获时间且估计性能稳定,可以满足矢量信号分析测试的快速处理要求。
The carrier synchronization based on Costas loop for OQPSK modulated signal test had long captured time and locked slowly.It can＇t fit for real analysis and test.This paper proposes an improved algorithm based on discrete Fourier transform for pre-estimation with simple carrier synchronization loop to resolve this problem.It can realize fast and precise locked in large frequency offset.Experiment result shows the proposed algorithm can reduce captured time effectively and has stable estimation function.So it can satisfy the requirement of OQPSK signal analysis and test with large frequency offset.
出处
《电子质量》
2016年第4期12-14,共3页
Electronics Quality
基金
电子测试技术国防科技重点实验室基金(9140C120201150C12003)
