计算机科学 ›› 2016, Vol. 43 ›› Issue (3): 99-102.doi: 10.11896/j.issn.1002-137X.2016.03.020
唐夲,张杰,皮羽茜,沈轩帆,廖勇
TANG Tao, ZHANG Jie, PI Yu-qian, SHEN Xuan-fan and LIAO Yong
摘要： 针对多输入多输出(Multiple-Input Multiple-Output,MIMO)场景下的对流层散射通信信道损耗进行了研究。在设计远距离MIMO通信系统时,链路损耗估计是其中的关键技术,而现有技术在损耗估计时都忽略了波束与散射体碰撞时的能量损耗。根据湍流非相干散射理论,首先将对流层建模为多条可微的曲线,从而与发射和接收天线阵列构成曲边梯形,根据此信道几何模型,计算入射角、反射角和散射角的角度关系；其次,建立了电磁波束射入散射体后散射波在散射体表面的能量分布模型；最后,根据波束传输距离,量化散射信道的损耗,推导得到基于MIMO对流层散射信道的衰落系数和信道矩阵。将仿真计算结果与实际数据进行对比,验证了所提模型在链路损耗估计问题上的有效性和准确性,同时根据仿真结果对接收天线的仰角设计提出了建议。
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