平坦地面无线信道的大尺度衰落特性  

Large-scale fading characterization for wireless channel on flat ground

作　　者：王代华[1] 宋林丽[1] 王宇龙 孔祥善[3] 张志杰[1] 

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]中国兵器工业软件工程与评测中心,北京100089 [3]中国兵器工业集团北方自动控制技术研究所,山西太原030006

出　　处：《计算机工程与设计》2012年第6期2141-2145,共5页Computer Engineering and Design

基　　金：中北大学仪器科学与动态测试教育部重点实验室青年基金项目(2011YF003)

摘　　要：针对近地面无线信道缺乏大尺度衰落模型的现状,选取平坦地面环境为典型研究对象,进行了2.4GHz无线信号沿近地面传播的信号强度测量,通过测量数据的线性回归建立了该地面环境的路径损耗模型。统计参数分析表明,双斜率对数距离路径损耗模型适用于近地面无线信道的大尺度衰落特性表征,突变点位置取决于收发天线高度,路径损耗指数在突变点前小于2,突变点后在2.87～3.74之间。所得模型与传统模型进行了性能对比,结果表明传统模型不适用于近地面无线信道的传播特性表征,本文所建模型更具实际意义。Considering the deficiency of large-scale fading model for near-ground wireless channel,a flat ground is selected as the typical measuring environment,and in which signal strength is measured through near-ground radio wave propagation at 2.4 GHz.The path loss model is obtained by linear regression based on the measured data,and the statistical parameters indicate that the Two-Slope path loss model is suitable for large-scale fading characterization of near-ground wireless channel.The breakpoint＇s position is determined by the transmission and receiving antenna heights,and the path loss exponent is less than 2 before the breakpoint and then between 2.87 and 3.74.The performance is compared between the proposed model and the generic models,and the result show that the generic models are unifitness when applying to near-ground environment and reinforces the practical value of the proposed model.

关 键 词：近地面无线信道 大尺度衰落 路径损耗 双斜率模型 无线传感器网络 

分 类 号：TN911[电子电信—通信与信息系统]