一种改进的数字UQPSK载波同步方法

A Modified Approach to Digital UQPSK Carrier Synchronization

UQPSK载波同步方法目前广泛应用于无人机数据链中的数据传输系统中,但相关的恢复方式只针对模拟信号或者环路复杂情况时实现难度大.为此提出一种改进的数字UQPSK载波同步方法,主要使用判决反馈锁相环路结合UQPSK信号的星座图特点进行改进,该方法可以在低信噪比情况下以快速的收敛速度实现相位补偿和相位快速捕获.经仿真UQPSK载波同步的系统并分析得到,改进的UQPSK载波同步方法的误码率与理论误码率相近,其系统可靠性高.户外实地测试实验验证了其可行性.

The approach to UQPSK carrier synchronization is widely used in digital satellite communication and UAV transmission of ground and tracking system.But it is hard to realize the related recovery modes for only analog signals or complex loop.So a modified approach to UQPSK carrier synchronization was presented based on decision feedback phase locked loop(PLL)with the constellation characteristics of UQPSK signal.The approach was arranged to be implemented quickly for phase compensation and fast phase capture with fast convergence speed under the condition of low signal-to-noise ratio.The simulation and analysis results of UQPSK carrier synchronization system show that the BER of the approach to UQPSK carrier synchronization is similar to the theoretical BER,and there is the high reliability in system.