A Multi-Ray Analysis of LOS V2V Links for Multiple Antennas with Ground Reflection
A Multi-Ray Analysis of LOS V2V Links for Multiple Antennas with Ground Reflection
复制标题
具有地面反射的多天线 LOS V2V 链路的多射线分析
DOI：
10.23919/aeit50178.2020.9241147
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
R. Sámano
中科院分区：
文献类型：
--
作者：
Amir Hossein Farzamiyan;Miguel Gutiérrez Gaitán;R. Sámano
本文提出了一种改进的车对车（V2V）几何多射线跟踪模型。该模型特别适用于存在地面反射的分布式天线收发器。假定在连续的车辆上，多个天线在水平和垂直方向上有规则地间隔。我们研究的主要焦点是多天线系统分别抵消或利用LOS信道组件中多射线的破坏性或建设性干扰的能力。这项工作是对现有V2V通道模型的补充，提供了更多关于地面反射如何影响LOS通道的细节。该分析最初是在MIMO（多输入多输出）系统的背景下进行的，以研究容量限制和奇异值分布等一般方面。然后，工作重点是在发射天线上使用单符号重复的方案，以及在接收器上使用两种不同的信号组合策略：最大比和等增益组合（分别为MRC和EGC）。将这些解决方案与全分集解决方案以及信息理论极限进行了比较。最后提出了一种优于所有其他解决方案的自适应天线选择机制。本文给出了对有耗材料进行复菲涅耳反射系数校正后的垂直偏振和水平偏振结果。此外，V2V系统中的多天线设计可用于抵消多射线对LOS信道组件产生的破坏性干扰。
This paper presents a vehicle-to-vehicle (V2V) geometric multi-ray tracing model for an improved line-of-sight (LOS) estimation. The model is especially suited for distributed antenna transceivers in the presence of ground reflections. The multiple antennas are assumed to be spaced regularly in horizontal and vertical directions over contiguous vehicles. The main focus of our study is the ability of the multiple antenna system to counteract or exploit, respectively, the destructive or constructive interference of multiple rays in the LOS channel component. This work is a complement to existing V2V channel models by providing more details on how ground reflections affect the LOS channel. The analysis is initially framed in the context of MIMO (multiple-input multiple-output) systems to investigate general aspects such as capacity limits and singular value distribution. The work then focuses on a scheme with single symbol repetition across the transmit antennas and two different strategies for signal combining at the receiver: maximum-ratio and equal-gain combining (MRC and EGC, respectively). These solutions are compared with a full diversity solution as well as with the information theoretical limits. An adaptive antenna selection mechanism is finally proposed that outperforms all other solutions. The paper shows both vertical and horizontal polarization results with corrected complex Fresnel reflection coefficients for lossy materials. Moreover, it is shown that multiple antenna design in V2V systems can be useful to counteract the destructive interference created by multiple rays on the LOS channel component.