室内短距离无线环境5.8 GHz频段传播特性研究

在室内办公室环境中,测量了5.8 GHz频段的短距离无线传播特性.基于大量的实测数据,利用线性回归建立路径损耗模型并得到阴影效应的统计特性.通过对测量频率响应傅里叶反变换得到冲激响应的功率延迟谱,得到时域均方根时延扩展的统计特性.进一步建立均方根时延扩展和频率相干带宽的经验指数反比关系表达式,并分析时延扩展与阴影效应之间的负相关性.上述研究结果可为“物联网”末端无线传感网中的节点布置、功率控制、射频识别等设计工作提供理论和实践依据.

Study on Wireless Propagation Characteristics Under Indoor Short-range Environment at 5.8 GHz Band

Propagation characteristics for wireless short-range environment were measured in office environment at 5.8 GHz band.Based on the actual measurement data,the path loss model is established by using linear regression and the statistic characteristics of shadow fading are described.The power delay profile of impulse response is obtained through the inverse Fourier transform of the frequency response and then the statistics characteristics of root mean square （RMS） delay spread in time domain are depicted.The empirical exponential inverse relationship expression between RMS delay spread and correlation bandwidth is established and negative correlation between Delay spread and the shadow fading is studied.The research provides theoretical and practical basis for sensor node spacing,power control,Radio Frequency Identification （RFID） design,etc.Wireless sensor network of ＂Internet of Things＂.