School of Automation, Wuhan University of Technology, Wuhan 430070, China.
Guangdong Communications and Networks Institute, Guangzhou 510700, China.
Sensors (Basel). 2021 May 23;21(11):3626. doi: 10.3390/s21113626.
The vehicle-to-vehicle (V2V) radio channel is non-stationary due to the rapid movement of vehicles. However, the stationarity of the V2V channels is an important indicator of the V2V channel characteristics. Therefore, we analyzed the non-stationarity of V2V radio channels using the local region of stationarity (LRS). We selected seven scenarios, including three directions of travel, i.e., in the same, vertical, and opposite directions, and different speeds and environments in a similar driving direction. The power delay profile (PDP) and LRS were estimated from the measured channel impulse responses. The results show that the most important influences on the stationary times are the direction and the speed of the vehicles. The average stationary times for driving in the same direction range from 0.3207 to 1.9419 s, the average stationary times for driving in the vertical direction are 0.0359-0.1348 s, and those for driving in the opposite direction are 0.0041-0.0103 s. These results are meaningful for the analysis of the statistical characteristics of the V2V channel, such as the delay spread and Doppler spread. Small-scale fading based on the stationary times affects the quality of signals transmitted in the V2V channel, including the information transmission rate and the information error code rate.
车对车（V2V）无线电通道由于车辆的快速移动而具有非平稳性。然而，V2V 信道的平稳性是 V2V 信道特性的一个重要指标。因此，我们使用局部平稳区域（LRS）来分析 V2V 无线电信道的非平稳性。我们选择了七个场景，包括三个行驶方向，即相同、垂直和相反方向，以及类似行驶方向的不同速度和环境。从测量的信道冲激响应中估计了功率延迟分布（PDP）和 LRS。结果表明，对平稳时间影响最大的是车辆的方向和速度。在同一方向行驶的平均平稳时间范围为 0.3207 到 1.9419 秒，在垂直方向行驶的平均平稳时间为 0.0359 到 0.1348 秒，在相反方向行驶的平均平稳时间为 0.0041 到 0.0103 秒。这些结果对于分析 V2V 信道的统计特性，如时延扩展和多普勒扩展，具有重要意义。基于平稳时间的小尺度衰落会影响 V2V 信道中传输信号的质量，包括信息传输速率和信息误码率。
