QPSK载波同步算法研究及FPGA实现

Research and Implementation of QPSK Carrier Synchronization Algorithm Based on FPGA

研究了基于工程应用的四相松尾环实现QPSK载波恢复算法、并分析了噪声对该算法的影响及该算法在FPGA上的实现。通过对锁相环分析,详细介绍了松尾环和环路滤波器的工作原理,并分别给出了System Generator的实现方法。实验结果表明使用松尾环能够在小信噪比情况下很好的实现载波同步,并且该种算法还能很容易的推广到MPSK载波恢复环路中。

A QPSK carrier recovery loop algorithm based on the engineering application of four-phase Matsuo loop is researched in this paper. This al- gorithm which influenced by noise is analyzed and implemented on FPGA. The working principle of Matsuo loop and loop filter is described by the analy- sis of PLL in detail, and the System Generator implementation methods are given in this paper. Experimental results show that this loop can be implemen- ted well the cartier synchronization in low SNR, and the algorithms can be easily used carrier synchronization loop in MPSK.