摘要
航天测控系统中需要满足多路扩频信号的稳定传输,当瞬时传递的同频点信息路数增大时多址干扰成为影响系统性能的主要因素。多址干扰抑制技术用于降低扩频信号间伪码互相关导致的系统自干扰,提高信道用户容量和传输性能。针对卫星导航系统地面测控系统数据链中多址干扰问题,分析了链路多址干扰影响模式,对联合检测和干扰消除的多用户检测技术进行了介绍和性能对比,并针对准同步传输体制研究了其在多址干扰抑制方面的能力。
Steady transmission of multi-channel spread spectrum signals is required in Space TTC system. As the number of instantaneous information transmissions at same frequency increases,MAI becomes a key factor that influences system capability. MAI suppression is used to depress system self-interference due to PNs cross-correlation,which improves user capability and transmission performance. Aimed at MAI on data link of ground TTC system for satellite navigation,the link MAI influence mode is analyzed. Multiuser detection technology and its performance analysis are introduced. MAI suppression capability of quasi-synchronous transmission system and power control technology are studied.
出处
《无线电工程》
2015年第7期50-53,共4页
Radio Engineering
关键词
多址干扰
卫星导航
多用户检测
准同步传输
功率控制
MAI
satellite navigation
multi-user detection
quasi-synchronous transmission
power control
