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多波束移动卫星系统的自适应开环预编码方法
安泽亮,宋高俊,陈慧慧
0
(南昌航空大学 信息工程学院,南昌 330063)
摘要:
对于卫星移动通信系统,由于卫星与地面终端之间的相对运动以及星地间传输延迟,传统的基于理想信道信息的预编码方法是不适用的。针对这一问题,提出了一种基于开环信道估计的预编码方法。卫星端利用开环获取的部分信道信息实现多波束联合预编码,并导出了系统传输速率的闭合解析表达式。此外,为了克服强干扰环境下多波束预编码系统性能恶化问题,提出了一种自适应预编码传输方法。卫星发射机依据开环获得的慢时变用户位置信道信息和信道统计量信息,自适应地选择预编码方法或传统频率复用方法,实现最优的系统性能。理论分析和仿真结果表明,与传统的干扰抑制方法相比,所提方法能实现更优的系统性能,同时也克服了传统预编码方法的局限性。
关键词:  多波束移动卫星通信系统  波束间干扰  开环信道估计  自适应预编码  干扰消除
DOI:
基金项目:国家自然科学基金资助项目(61362013,61661035)
Adaptive open-loop precoding scheme for multi-beam mobile satellite communication systems
AN Zeliang,SONG Gaojun,CHEN Huihui
(School of Information Engineering,Nanchang Hangkong University,Nanchang 330063,China)
Abstract:
The conventional precoding scheme based on perfect channel-state information(CSI) is not suitable for satellite mobile communication system due to the round-trip delay and satellite-land relative motion.For this problem,a precoding scheme based on open-loop channel estimation and derives system transmission rate is proposed,in which the transmitter utilizes open-loop partial CSI to achieve multi-beam joint precoding.In addition,an adaptive precoding scheme is also presented to deal with the performance deterioration in strong interference.According to the open-loop slowly-time-varying user location and channel statistics information,the transmitter adaptively chooses precoding and frequency refuse method to achieve optimal system performance.The theoretical analysis and simulation results validate substantial performance gains compared with traditional interference elimination scheme and demonstrate that the proposed schemes also overcome the limitation of conventional precoding techniques.
Key words:  multi-beam mobile satellite communication system  inter-beam interference  open-loop channel estimation  adaptive precoding  interference alleviation
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