低轨卫星通信系统下行链路设计

针对低轨卫星通信系统特点,结合当前世界上应用最广泛的数字卫星电视广播( Digital Video Broadcasting,DVB)协议,对卫星通信下行链路进行设计与验证.介绍了协议整体架构的设计和链路模型的搭建,重点描述了同步模块中的预频偏估计过程的设计.频偏预估计实现了在进行精细的频偏估计和补偿之前对大频偏的估计...

Downlink design of LEO satellite communication system

According to the characteristics of low Earth orbit(LEO)satellite communication system and the world s most widely used digital satellite television broadcasting(DVB)standard protocol,the satellite communication downlink is designed and verified.The design of the overall architecture of the protocol and the construction of the link model are introduced,and the design of the frequency offset pre-estimation process in the synchronization module is emphasized.Frequency offset pre-estimation realizes the operation of large frequency offset estimation and compensation before fine frequency offset estimation and compensation,which reduces the requirement of the estimation range of the following frequency offset estimation module,thus improving the performance of the whole link frequency offset estimation and compensation.The simulation test verifies the good effect of the link and shows that it is suitable for engineering development.