作　　者： ; ; ;

机构地区： 东南大学信息科学与工程学院移动通信国家重点实验室

出　　处： 《Journal of Southeast University(English Edition)》 2007年第2期151-155,共5页

摘　　要： 应用基于时域有限差分法(FDTD)的XFDTD仿真工具分析研究2.4/5.2/5.7GHz穿戴式躯域传感器网络(W-BSN)的体表路径损耗和时延特性.仿真环境为置于自由空间中的简化三维人体模型.分析结果表明,当工作频率较高时,路径损耗相对较小;当发送点和接收点都置于主躯干时,路径损耗与最小等效体表距离遵循对数拟合模型,并且2.4,5.2,5.7GHz下的衰减指数分别为4.7,4.1和4.0.另一方面,各接收点的首径延迟约小于2ns,而最大时延扩展为10ns.为避免多径延迟引起的码间干扰,建议W-BSN的传输速率应小于108符号/s. The on-body path loss and time delay of radio propagation in 2. 4/5.2/5.7 GHz wearable body sensor networks （W-BSN） are studied using Remcom XFDTD, a simulation tool based on the finite-difference time- domain method. The simulation is performed in the environment of free space with a simplified three- dimensional human body model. Results show that the path loss at a higher radio frequency is significantly smaller. Given that the transmitter and the receiver are located on the body trunk, the path loss relevant to the proposed minimum equivalent surface distance follows a log-fitting parametric model, and the path loss exponents are 4. 7, 4. 1 and 4. 0 at frequencies of 2. 4, 5.2, 5.7 GHz, respectively. On the other hand, the first- arrival delays are less than 2 ns at all receivers, and the maximum time delay spread is about 10 ns. As suggested by the maximum time delay spread, transmission rates of W-BSN must be less than 10^8 symbol/s to avoid intersymbol interference from multiple-path delay.

关 键 词： 信道模型 路径损耗 时延特性 穿戴式躯域传感器网络

领　　域： [电子电信] [电子电信]