软件接收机中QPSK信号同步器的设计与实现  

Design and implementation of QPSK signal synchronizer in software receiver

作　　者：马涛[1] 雷洪利[1] 向新[1] 王锋[1] 孙晔[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《计算机工程与设计》2015年第9期2346-2350,共5页Computer Engineering and Design

基　　金：陕西省自然科学基金项目(2014JM2-6106)

摘　　要：以数字锁相环理论为依据,对Gardner定时恢复算法和Costas环载波相位补偿算法进行深入研究,提出一种应用于软件接收机中的QPSK信号同步器,给出同步器的具体设计参数。在Matlab/Simulink环境下使用基于模型设计的方法对同步器进行仿真,分析同步器的收敛速度及对系统误码率的影响。仿真结果表明,同步器在1%时钟偏差和0.1%载波频率偏差的情况下能够完成同步,系统的误码率接近实际接收机。According to the theory of digital phase-lock loop, the Gardner timing recovery algorithm and the Costas loop carrier recovery algorithm were studied and a QPSK signal synchronizer was designed for software receiver with specific parameters. The synchronizer was simulated using model-based method on Matlab/Simulink, and the convergence rate and its influence on symbol error rate were analyzed. Results demonstrate that the synchronizer can realize synchronization with 1 % timing deviation and 0. 1 %carrier frequency deviation and the symbol error rate of receiver approaches the performance of actual receiver.

关 键 词：软件接收机 加德纳算法 科斯塔斯环 正交相移键控 同步器 

分 类 号：TN911.8[电子电信—通信与信息系统]