基于空时编码的高效星地数据传输技术  

High-efficiency satellite-to-earth data transmission technology based on space-time coding

作　　者：丁丹 林存宝 DING Dan;LIN Cunbao(Department of Electronic and Optical Engineering,Space Engineering University,Beijing 101416,China)

机构地区：[1]航天工程大学电子与光学工程系,北京101416

出　　处：《现代电子技术》2019年第5期6-9,14,共5页Modern Electronics Technique

基　　金：国家高技术研究发展计划("863")(2015AA7026085)~~

摘　　要：为提升星地数据传输效率,多采用时间域变速率传输模式,但改善程度有限。文中从空间域角度着手,提出基于空时编码的高效星地数据传输技术,通过空时预编码将多个混叠的数据流分离开来,形成多个编码通道同时传输多路并发数据,并且能够在空间域上收集散射、反射路径功率,从而充分利用有限的链路功率。分析与仿真结果显示,采用星上2天线对2个用户的传输模式,相比传统点对点的传输模式其频谱效率可提升0.5～1 b?s^(-1)?Hz^(-1)。The time-domain variable rate transmission mode is often adopted to increase the transmission efficiency of satellite-to-earth data,but has limited improvement.Proceeding from the space.domain perspective,a high.efficiency satellite.to.earth data transmission technology based on space.time coding is proposed.The multiple aliasing data streams are separated by means of space-time precoding to form multiple coding channels for multi.channel parallel data transmission.The scattered and reflected path power is collected to fully utilize the limited link power.The analysis and simulation results show that,in comparison with traditional point-to-point transmission mode,the spectrum efficiency of the data transmission mode of two antennas on satellite to two users is improved by 0.5~1b·s^-1·Hz^-1.

关 键 词：空时编码 数据传输 相关性 频谱效率 链路 功率 

分 类 号：TN919.1-34[电子电信—通信与信息系统] V249.3[电子电信—信息与通信工程]