摘要
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。
It＇s known that the existing satellite-earth data transmission system has low transmission rate and single modulation mode and cannot be reconfigured in orbit. In order to solve these problems, a high- speed data transmitter scheme based on digital modulation is proposed by using modem digital signal pro- cessing technique and advanced digital components. The system structure, basic principle and core compo- nents are introduced in brief, while channel coding technology with high gain and low complexity, digital shaping technology based on LUT and baseband digital pre-distortion technology are analyzed in detail. Besides, the corresponding technological approaches are given, which lay foundation for the implementa- tion of digital data transmission system in the future.
出处
《通信技术》
2014年第5期544-548,共5页
Communications Technology
