基于反正切相位检测的Costas环分析及FPGA实现

Costas Loop Analysis Based on Arctangent Phase Detection and FPGA Implementation

载波同步是数字无线通信中的一个重要问题,通过对目前QPSK系统中常用的载波同步方法进行比较,在此基础之上介绍了一种基于反正切相位检测的Costas环相干载波提取算法。利用现场可编程门阵列FPGA的可编程性,详细地将此算法模块化,最后在Quartus Ⅱ实现仿真验证。结果表明,该算法载波同步效果良好。随着FPGA的发展,提出的算法对于载波同步环路抖动要求严格的系统具有一定实用价值。

Carrier synchronization is a key problem in digital wireless communication system. By comparing some carrier synchronization methods in QPSK system,this article describes a Costas-loop coherent carrier extraction algorithm based on Arctangent phase detection. The algorithm is implemented with QuartusⅡsoftware in the FPGA platform. The simulation result indicates that the algorithm is fairly good in carrier synchronization performance, and with development of FPGA,is of certain practical value for the loop jitter requirement of QPSK systems.