This article discusses modern techniques of implementation of a wideband digital modulator in an FPGA kit for use in electrical engineering communications laboratory. Previous configurations proposed in literature present limitations, as lack of details about the methods used in the algorithm developed and test procedures. Those key details can help researchers to develop this modulator more effectively. From technical point of view, previous works were also implemented for small bandwidth output signals. The proposed digital modulator has low cost and can generate signals based on several modulation schemes with various output roll-off filters. This proposed kit allows researchers to change digital signal characteristics through dip-switches, customizing the modulated signal. Advanced techniques such as parallelism of processes and fast access to look up tables using an FPGA were used to achieve the desired objective, and are detailed in the article. Besides this implementation, this article also shows test procedures to validate the performance of digital modulators using lab test equipment. Those procedures were used to validate the FPGA modulator developed. The paper shows how researchers can analyze the performance of digitally modulated output signals using an Oscilloscope, a Spectrum Analyzer, and a Vector Signal Analyzer. Features such as symbol rate, modulation constellation, roll-off output filter, and EVM are covered.

本文讨论了用于电气工程通信实验室的FPGA套件中宽带数字调制器实现的现代技术。文献中提出的先前配置存在局限性，因为缺少有关所开发算法和测试程序的方法的详细信息。这些关键细节可以帮助研究人员更有效地开发这种调制器。从技术角度来看，先前的工作也针对小带宽输出信号进行。所提出的数字调制器具有低成本，并且可以基于具有各种输出滚降滤波器的几种调制方案来生成信号。该提议的套件允许研究人员通过拨码开关更改数字信号特性，从而定制调制信号。先进的技术（例如过程并行性和使用FPGA的快速访问查询表）已用于实现所需的目标，本文对此进行了详细介绍。除了这种实现之外，本文还介绍了使用实验室测试设备来验证数字调制器性能的测试程序。这些程序用于验证开发的FPGA调制器。本文展示了研究人员如何使用示波器，频谱分析仪和矢量信号分析仪来分析数字调制输出信号的性能。涵盖了诸如符号率，调制星座图，滚降输出滤波器和EVM之类的功能。本文还介绍了使用实验室测试设备验证数字调制器性能的测试程序。这些程序用于验证开发的FPGA调制器。本文展示了研究人员如何使用示波器，频谱分析仪和矢量信号分析仪来分析数字调制输出信号的性能。涵盖了符号率，调制星座图，滚降输出滤波器和EVM等功能。本文还介绍了使用实验室测试设备验证数字调制器性能的测试程序。这些程序用于验证开发的FPGA调制器。本文展示了研究人员如何使用示波器，频谱分析仪和矢量信号分析仪来分析数字调制输出信号的性能。涵盖了诸如符号率，调制星座图，滚降输出滤波器和EVM之类的功能。