全数字QPSK接收机同步技术研究

Research on synchronization of all digital QPSK receiver

时钟同步和载波同步是接收机的关键问题,传统模拟解调可靠性、稳定性差,调试复杂。介绍了1种全数字QPSK接收机的定时同步和载波同步方法,它采用最佳采样点提取以及差分相位求解的方法实现同步。同步计算全部由软件实现,设计灵活。计算机仿真结果表明,该方法是可行的,适合DSP实现。

Time synchronization and carrier synchronization are cruxes of receiver. The reliability and stability of traditional analog demodulation are bad, and adjustment is complex. A kind of time synchronization and carrier synchronization method is introduced in this paper, extraction of optimum sample-point and calculation of differential phase solution are used to achieve synchronization. All calculations of synchronization are completed by software, which has good flexibility. The results of computer simulation indicate that this method is feasible and suitable for the implementation in DSP.