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针对现有卫星对地数传系统传输速率低、调制模式单一和无法在轨重配置等问题,运用了现代数字信号处理技术和先进数字元器件,提出了一种基于数字调制的高速数传发射机方案。简要介绍了系统结构、基本原理和核心器件,重点分析了方案中的高增益、低复杂度的信道编码技术、基于并行查表的数字成型技术和基带数字预失真技术,并给出了相应的技术方案,为下一代数字化卫星数据传输系统的实现奠定基础。
Aiming at the problems of low transmission rate, single modulation mode and in-orbit reconfiguration of existing digital terrestrial data transmission systems, a digital transmission system based on digital modulation and high-speed digital transmission is proposed using modern digital signal processing technology and advanced digital components. Machine program. The system structure, basic principle and core devices are briefly introduced. The high gain and low complexity channel coding technology in the scheme are analyzed emphatically. The digital forming technology based on parallel look-up table and baseband digital predistortion technology are given. Correspondingly, Technical solutions for the next generation of digital satellite data transmission system to lay the foundation for the realization.