中文摘要：

通过对无线通信系统基带信号调制解调方法的研究，提出了一种基于FPGA的4QAM调制解调系统的设计及实现方案．分析了QAM调制解调的基本原理，给出了系统的硬件架构及相关器件的选型．重点介绍了基于状态机模型的FPGA功能模块．实验分析结果表明：基于FPGA的4QAM调制解调系统在数据传输方面具有较高的准确率，在系统运行的稳定性方面具有很高的可靠性，该方案具有较高的应用价值．

英文摘要：

Based on the research of baseband signal demodulation in wireless communication system, this paper realizes the 4QAM modulation and demodulation scheme based on FPGA. Firstly, the basic principles of QAM modulation and demodulation are introduced, and then the design of hardware system and selection of the instruments are presented. Finally and most importantly, the state-machine-based FPGA function module is introduced. The practical measurements show that the system has higher accuracy on the aspect of data transmission and high reliability on the aspect of system operation stability. The scheme has high application value.