本文给出了一种可适用于卫星通信的可编程数字调制解调器的设计实现方法 ,并采用FPGA具体实现验证。文中介绍了全数字调制解调器设计的基本原理、总体结构 ,并重点分析和讨论了以ASIC实现可变参数全数字调制解调的关键技术。该调制解调器具有多项可编程参数 ,通过其编程接口设置不同的参数 ,可适用于多速率数据传输 ,适合于各种信道限带性能要求 (即滚降系数α )的传输系统 ,满足卫星通信的要求 ,具有广阔的应用前景 This paper presents a design and implementation of a programmable digital modem that is suitable for satellite communications and implements FPGA-specific verification. This paper introduces the basic principle and overall structure of all-digital modem design, and analyzes and discusses the key technologies of realizing all-digital modulation and demodulation of variable parameters with ASIC. The modem has a number of programmable parameters through its programming interface to set different parameters can be applied to multi-rate data transmission, suitable for a variety of channel bandwidth performance requirements (ie, roll-off factor α) transmission system to meet the satellite communications Requirements, has a broad application prospects