计算机科学 ›› 2019, Vol. 46 ›› Issue (11): 72-79.doi: 10.11896/jsjkx.181001862

• 网络与通信 • 上一篇    下一篇

基于Ka频段的低轨卫星自适应信息传输方案

于秀兰, 王思仪   

  1. (重庆邮电大学通信与信息工程学院 重庆400065)
  • 收稿日期:2018-10-08 出版日期:2019-11-15 发布日期:2019-11-14
  • 通讯作者: 王思仪(1994-),女,硕士生,主要研究方向为移动卫星通信技术,E-mail:351203934@qq.com
  • 作者简介:于秀兰(1973-),女,硕士,副教授,主要研究方向为无线通信理论与技术,E-mail:yuxl@cqupt.edu.cn。
  • 基金资助:
    本文受重庆邮电大学文峰人才工程项目(E010W2016034),国家自然科学基金项目(61601075),重庆市科委自然科学基金项目(cstc2016jcyjA0174)资助。

Adaptive Information Transmission Scheme for LEO Satellite Based on Ka Band

YU Xiu-lan, WANG Si-yi   

  1. (School of Communication and Information Engineering,Chongqing University of Posts andTelecommunications,Chongqing 400065,China)
  • Received:2018-10-08 Online:2019-11-15 Published:2019-11-14

摘要: 针对Ka频段卫星通信信号传输易受降雨和地面移动环境影响的问题,结合低轨卫星高速移动特点及星地链路电波传播特性,对Ka频段下的低轨卫星信道雨衰分布进行了研究,提出了一种基于Ka频段的低轨卫星自适应信息传输方案。首先,针对信号在空间传输受降雨及周围环境两种因素影响的问题,建立了Ka频段的低轨卫星移动通信信道模型;其次,根据卫星仰角变化范围以及仰角概率密度函数推导得到基于卫星仰角变化的雨衰概率密度函数;然后,根据当前信道状态和雨衰概率密度函数计算得到信道参数值,从而确定信道状态信息;接着,根据已确定的信道状态信息,计算得到当目标误码率为1×10-4时不同信道状态和调制编码方式下的信噪比阈值;最后,利用自适应调制编码选择算法,将反馈信噪比与计算得到的信噪比阈值进行对比,选出最佳调制编码方式对信号进行调制编码之后再传输,以提高空间信息传输的可靠性。仿真结果表明,在不同信道状态下,卫星仰角越小,地面阴影程度越严重,系统误码率越高,自适应信息传输方案使得系统误码率始终低于目标误码率1×10-4。从而进一步说明,所提出的自适应信息传输方案可以有效地解决信号因降雨、地面移动环境以及卫星移动性三方面因素共同导致的严重衰减问题,从而有效提升了Ka频段低轨卫星系统的信息传输质量。

关键词: Ka频段, 低轨卫星, 卫星仰角, 雨衰分布, 自适应调制编码

Abstract: Aiming at solving the problem that Ka-band satellite communication signal transmission is easily affected by rainfall and ground environment,this paper studied the distribution of the Ka-band based rain attenuation of LEO satellite channel by considering the high-speed movement characteristics of LEO satellite and the propagation characteristics of satellite-to-earth link,and proposed an adaptive information transmission scheme for LEO satellite to improve the reliability of system information transmission.Firstly,a Ka frequency band LEO satellite mobile communication channel model is established to solve the problem that the transmission signal is easily affected by rainfall and the variation of elevation angle.Secondly,the probability density function of the rain attenuation based on the change of the elevation angle is calculated by combining the elevation varying range and the elevation probability density function of LEO satellite.Thirdly,according to the probability density function of the rain attenuation and the current channel state,the channel parameters are calculated and the channel state information can be obtained.Then,according to the confirmed channel state information,the signal-to-noise ratio thresholds of different channel states and different modulation coding modes can be calculated with the error rate of 1×10-4.Finally,by comparison of the feedback signal-to-noise ratio and the calculated signal-to-noise ratio thresholds,the best modulation and coding mode is selected through the adaptive modulation coding selection algorithm,which can promote the transmission reliability of spatial information.The simulation results show that the lower the elevation angle of satellite is,the more serious the ground shadowing is,and the bit error ratio of system is higher under the different channel states.The proposed adaptive information transmission scheme makes the bit error ratio of the satellite communication systems always lower than the target bit error ratio of 1×10-4.The results show that the proposed adaptive information transmission scheme can effectively solve the problem of serious attenuation of transmission signal caused by rainfall,ground mobile environment and satellite mobility,and effectively enhance the information transmission quality of LEO satellite system based on Ka band.

Key words: Adaptive modulation and coding, Ka band, LEO satellite, Rain attenuation distribution, Satellite elevation angle

中图分类号: 

  • TN929.5
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