3.5GHz车联网信道测量与仿真对比分析

Contrastive analysis of internet of vehicles on channel measurement and simulation at 3.5GHz

针对第五代(the 5th Generation,5G)移动通信试验频段中的3.5GHz开展测量和分析研究.利用自主研发的频域信道探测系统对车联网场景进行测试,同时,利用自主研发的射线跟踪仿真器产生车联网场景的信道数据.通过校正几何模型和材料库对实测场景进行仿真,并与实测结果进行接收功率的对比,进而利用对数距离路径损耗模型对实测和仿真场景的路径损耗曲线进行拟合.结果表明,仿真场景的路径损耗因子和阴影衰落标准差的相对误差都不超过7%,从而验证了射线跟踪仿真器在信道仿真中的有效性和准确性.本文的研究内容将对未来5G车联网中低于6GHz频段的选择和网络部署提供研究依据和指导.

In this paper, measurement and analysis are carried out for 3.5 GHz in the 5th generation（5G）mobile communication test frequency band. The self-developed frequency domain channel sounding system is used to measure the 3.5 GHz channel in the vehicular network scenario. Moreover, the same channel data is generated by the self-developed ray-tracing simulator. The calibrated geometric model and material library are used to simulate the measured scenario and compare with the received power of the measured result. Finally, the path loss curves of the measured and simulated results are fitted by the logarithmic distance path loss model. The results show that the relative error of path loss factor and standard deviation of the simulated scene are less than 7％, which verifies the effectiveness and accuracy of the ray-tracing simulator in channel simulation.Both the path loss exponent and shadowing factor,which are studied in this paper, will be useful for the frequency band selection and network deployment of the 5G vehicular networks at frequencies lower than 6 GHz.