QPSK调制解调系统设计及FPGA实现

Design and FPGA Implementation of QPSK Modem System

该文主要研究了四相相移键控调制解调器的实现。通过对四相相移键控解调系统的载波同步、位同步和相位模糊纠正模块设计,提出了一种现场可编程门阵列硬件可实现的四相相移键控调制解调系统设计方案,并进行了KC705-FPGA实验板下载测试。实验结果表明,该方案性能达到预期目标,能实现原始基带调制信号的准确还原。

This paper mainly introduces the implementation of quadrature phase shift keying（ QPSK） modem. By the design of the module of carrier and symbol synchronization and phase ambiguity correction in QPSK demodulation system,a field programmable gate array（ FPGA） hardware based QPSK modem system is proposed for realization and then it is tested in a KC705-FPGA evaluation board. The experimentation results indicate that the proposed scheme attain the anticipated goal of realizing precise modulated baseband signal recovery.