城市微蜂窝环境下移动通信的传播特性研究  

Research on Mobile Communication Propagation Characteristics for Urban Micro-cellular Environment

作　　者：陈枫[1] 刘芫健[1] 

机构地区：[1]南京邮电大学电子科学与工程学院,江苏南京210003

出　　处：《计算机技术与发展》2015年第10期115-118,122,共5页Computer Technology and Development

基　　金：国家自然科学基金资助项目(60671065);教育部博士点基金(20123223120003)

摘　　要：随着移动通信技术及其应用的迅猛发展,出现了一个非常热门的课题,在城市微蜂窝环境下研究电波传播特性。移动通信技术的飞速增长使得移动通信系统越来越不能满足人们的通信需求,微蜂窝技术因发射功率低、频率复用距离短等优点,成为提高信道容量的主要手段。文中首先基于SBR/IM对典型的室外电波传播模型进行了仿真,仿真结果与已知文献测量结果一致性良好。接着,仿真了非规则室外实用场景,得到不同情况下的路径损耗,并研究各种因素对路径损耗的影响,以此来分析城市微蜂窝环境下的电波传播。最后仿真得到了一些结论:全面的模型必须考虑绕射的贡献;适当的类别和射线数量能减少运行时间;基站天线的高度在非可视区域与可视区域对路径损耗的影响不同。此次仿真的是经过简化的环境,忽略了一些对电波传播有影响的因素,比如道路上的移动体、树木以及建筑物表面的粗糙度。该研究为以后简化室外传播模型提供了理论基础,有利于城市微蜂窝环境下基站的规划与优化。As the rapid development of the mobile communication technology and its application in recent years, the propagation charac- teristics for urban area have become an important subject. For the explosive growth of mobile communication, mobile communication sys- tems are increasingly unable to meet the needs for people. The micro-cellular technology ,due to the advantage of low transmitting pow- er, the short distance of frequency reuse and so on, has become the primary mean to improve the channel capacity. Firstly, the mobile communication propagation characteristics in outdoor environment are simulated and analyzed using the method of SBR/IM （ Shooting and Bounding Ray tracing/Image） in this paper. And it is agreed well by a comparison of simulated results and measured results. Then, through simulating irregular outdoor practical scene,can get the path loss under different circumstances and study various factors on the impact of path loss to analyze radio wave propagation in urban micro-cellular environment. Finally, some conclusions are obtained by simulation：a comprehensive model must consider the contribution of diffraction; the appropriate category and the number of rays can re- duce the running time;the influences from the height of the base station antennas to the path loss are different between non-visible area and the visible area. The simulation system is simplified, ignoring the impact of trees, the moving body on the road as well as the rough- ness of various buildings＇ surface. The study provides the theoretical foundation to simplify for outdoor propagation model and benefits the base station planning and optimization of urban micro-cellular environment.

关 键 词：SBR/IM 非规则室外 城市微蜂窝 路径损耗 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]