摘要
由于超小口径终端(USAT)卫星通信系统采用小口径天线工作,其在多址接入设计和接入控制设计上与甚小口径终端(VSAT)系统区别较大。结合规范对功率谱密度的强制性要求,对USAT系统上行链路计算分析,给出链路容量与需要的最小信噪比的关系以及采用扩频多址接入建议;为提高系统资源利用率,提出USAT系统上下行链路频率复用的异步载波成对抵消技术的设计思路,并针对阻塞环境条件下,分析了采用本地控制突发和快速捕获技术远端站的反向链路传输性能。
By reason of ultra small aperture antenna,USAT system is much different from VAST system in multiple access and access control scheme design.According to FCC regulatory requirements,the relationship that relates uplink capacity to minimum required Eb/N0 is achieved via the link budget.It was shown that spread spectrum access is necessary.This paper proposes design idea of the asymmetric PCMA frequency reuse scheme for more efficient use of the transponder.Based on locallycontrolled burst transmission scheme and quick-recovery of forward link reception,it discusses performance of return link in blockage.
出处
《无线电通信技术》
2011年第2期4-6,38,共4页
Radio Communications Technology
关键词
USAT
功率谱密度
SSMA
A-PCMA
ultra small aperture terminal
EIRP density
spread spectrum multiple access
asymmetric paired carrier multiple access
