两种隧道场景下车对车无线信道衰落特性的测量与分析  

Measurement and analysis of fading characteristics of V2V propagation channel in two tunnels

作　　者：张旭[1] 姜苏英 杨汨 王威 何睿斯[4] 侯俊[1] 刘鑫一 ZHANG Xu;JIANG Suying;YANG Mi;WANG Wei;HE Ruisi;HOU Jun;LIU Xinyi(Chang’an University,Xi’an 710064,China;Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]长安大学信息工程学院,西安710064 [2]长安大学,西安710064 [3]北京交通大学轨道交通控制与安全国家重点实验室,北京100044 [4]北京交通大学,北京100044

出　　处：《电波科学学报》2021年第3期443-452,共10页Chinese Journal of Radio Science

基　　金：长安大学研究生科研创新实践项目(300103703012);国家自然科学基金(61871059)。

摘　　要：针对车-车(vehicle to rechicle,V2V)通信系统对无线电信道衰落特性和模型的需求,分别在两种隧道场景中5.9 GHz和5.2 GHz频段下进行了V2V无线电信道测量活动,并对隧道外、隧道内和两者之间的连接部分场景进行了小尺度衰落特性分析.基于近距离(close-in,CI)对数模型和ABG(α-β-γ)模型建立了基于距离的接收功率模型,对两种场景隧道内外的接收功率进行了评估和比较,路径损耗指数分别为1.83和1.9,结果表明参考距离为1 m的CI对数模型具有更高的拟合度.此外,将测量数据幅度的衰落分布与五种典型的理论衰落分布进行比较分析,发现其特征更接近于具有最小拟合优度值的莱斯分布,且隧道内的莱斯K因子小于隧道外.同时,给出了隧道内和隧道外之间连接处基于距离的莱斯K因子模型,发现连接处的K因子与距离无关,而隧道内的K因子随距离增大而减小.In order to fulfill the requirement of vehicle-to-vehicle communication system for wireless channel fading characteristics and corresponding models,vehicle to vehicle(V2V)wireless channel measurement activities are carried out at the frequency bands of 5.9 GHz and 5.2 GHz in two kinds of tunnel scenes.And small-scale fading characteristics are analyzed for outside the tunnel,inside the tunnel and their junction part.Based on the close-in(CI)log-distance model and ABG(α-β-γ)model,the distance dependent received power models are established.The received power inside and outside the tunnel in the two scenarios are evaluated and compared,and the path loss index is 1.83 and 1.9,respectively.The results show that the CI model with a reference distance of 1 m has higher fitting degree.In addition,the fading distribution of measured data amplitude is compared with five typical theoretical fading distributions,and it is found that its characteristic is closer to the Rice distribution with the minimum goodness of fit value,and the Rice K-factor in the tunnel is smaller than that outside the tunnel.Further,distance-based K-factor models for the tunnel and the junction part are presented.We find that the K-factor at the conjunction area are independent of the distance,while the K-factor inside the tunnel decreases with the increase of the distance.

关 键 词：车-车(V2V) 传播信道 隧道 衰落分布 K因子 

分 类 号：TN929.5[电子电信—通信与信息系统]