基于FPGA的数字信号发生器及其在QPSK调制中的应用

在现代通信中利用载波携带数字信息的传输应用广泛,如PSK、QAM等调制技术均要用到正弦形式的载波。传统的载波产生采用模拟电路实现,不利于集成且性能受限。文章讨论使用FPGA芯片、利用直接数字频率合成技术制作成数字信号发生器,该信号发生器具有体积小、功能强的优点,且结合该信号发生器在QPSK调制器中的实际应用验证了该方案的合理性。

Digital Signal Generator Based on FPGA and Its Application in QPSK Modulation

Using the carrier to carry digital information in modern communication is a widespread application,such as PSK and QAM technologies,both of them need the carrier with sin wave.The traditional way to generate carrier uses analog circuit,which is hard to integrate and in bad efficacy.The paper(discussed) how to use FPGA and DDS to get digital signal generator,which had advantages of small volume and strong functions.The practical application of this digital signal generator in QPSK modulation vali-(dated) the rationality of this scheme.