【作者】 张燕；

【导师】 王玉皞；

【作者基本信息】 南昌大学 ， 通信与信息系统， 2010， 硕士

【摘要】 本论文在广泛阅读有关移动通信无线信道传播模型和VANET的文献资料基础上,首先,推导三维场景下双移动节点间链路的多普勒功率谱模型,给出时间自相关函数和多普勒功率谱的解析表达式,进一步以该模型为基础,分析无线电波在VANET网络环境中的小尺度衰落特性；然后,在典型城区环境实现对VANET链路层性能实测评估；其次,分析实测场景中无线电波传播特性,提炼信道特征参量,建立一个适用于VANET的综合无线信道传播模型；最后,以建立的VANET综合信道模型为基础实现对VANET链路层性能评估,并将仿真结果与实测结果进行比较。本文研究的主要贡献及创新点如下：1)建立三维场景下双移动节点链路的多普勒功率谱模型,给出其解析表达式,该模型是与节点移动速度、终端天线辐射函数和散射环境有关的随机性模型；同时,以该模型为基础,分析电波在VANET网络环境中的小尺度衰落特性。2)在典型城区环境中实现VANET链路层(包级)性能实测工作。3)分析在该实测场景下无线电波的传播特点,建立VANET的综合无线信道传播模型,并以该模型为基础实现对VANET链路层性能仿真。仿真结果表明提出的综合信道模型可用于典型城区环境中VANET链路层性能评估。更多还原

【Abstract】 Firstly, the dissertation analyzes the performance of wireless radio propagation in VANET based on referencing many literatures on wireless radio propagation model in wireless communication system and VANET, then addresses Doppler Spectrum model for radio link between double mobile nodes in three-dimensional(3-D) scenario, and gives the analytical expressions of time-autocorrelation function and Doppler Spectrum. Then using the proposed model to analyze the characters of wireless radio’s small-term fading in VANET. Secondly, making a measurement of packet-level performance of VANET in a densely build-up urban environment. Thirdly, analyzing the performance of wireless radio’s propagation in the measurement scenario, then the paper proposes a hybrid propagation model for VANET in densely build-up urban environment, moreover, using the hybrid model as the physical model in OMNET++to evaluate the packet-level performance of VANET. The results of simulation are compared with that of measurement.The main contribution and innovative outlines of this paper are as following:1) Addressing Doppler Spectrum model for radio link between double mobile nodes in 3-D scenario, and giving its analytical expression which is relative to the speed of mobile nodes, the probability distribution of the transmitted(received) multi-wave and the antenna. Furthermore, analyzing the characters of wireless radio’s small-term fading in VANET based on the proposed model.2) Measuring the packet-level performance of VANET in wuhan city.3) Analyzing the performance of wireless radio propagation in measurement environment, then proposing a hybrid channel model to evaluate the packet-level performance of VANET. The simulation results of packet-level performance are approximately consistent with that in measurement.更多还原