计算机科学 ›› 2019, Vol. 46 ›› Issue (11): 72-79.doi: 10.11896/jsjkx.181001862
于秀兰, 王思仪
YU Xiu-lan, WANG Si-yi
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。
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