摘要
欲提高卫星与地面接收站之间的数据传输效率,一般是从策略层着手,采用传输速率随卫星仰角升高而增加的传输模式。为进一步挖掘星地传输链路的潜力,从调制方式着手,设计具有较高功率效率和频谱效率的调制方式,从物理层的角度着手提高链路功率利用率,提出一种能够提升星地数传效率的改进SOQPSK调制方式。分析与仿真结果表明,相比传统QPSK和普通SOQPSK,改进SOQPSK信号的带外频谱功率得到进一步降低,能够将有限的链路功率汇聚至信号主瓣,减少在旁瓣上的功率浪费,从而提升星地数据的传输效率。
To increase the efficiency of data transmission between satellite and earth station,transmission strategies are always adopted,including the transmission mode in which the transmission rate rises as the satellite angle increases.In order to further exploit the satellite-earth transmission potentialities,a new physical layer signal modulation method,improved SOQPSK,with higher power efficiency and frequency efficiency,is provided in this paper.Analyzing and simulation results show that,comparing with common QPSK and traditional SOQPSK,the improved SOQPSK method has lower out-of-band power,gathering the link power to the main lobe,and suppressing the side lobe power,thus promoting the satellite-earth transmission efficiency.
作者
丁丹
谢晴
DING Dan;XIE Qing(Electronic and Optical Engineering Department,Space Engineering University,Beijing 101416,China)
出处
《无线电工程》
2019年第4期304-307,共4页
Radio Engineering
基金
国家高技术研究发展计划("863"计划)基金资助项目(2015AA7026085)
