CAJ | 학술논문

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。
수착이동통신기술급기응용적신맹발전，출현료일개비상열문적과제，재성시미봉와배경하연구전파전파특성。이동통신기술적비속증장사득이동통신계통월래월불능만족인문적통신수구，미봉와기술인발사공솔저、빈솔복용거리단등우점，성위제고신도용량적주요수단。문중수선기우SBR/IM대전형적실외전파전파모형진행료방진，방진결과여이지문헌측량결과일치성량호。접착，방진료비규칙실외실용장경，득도불동정황하적로경손모，병연구각충인소대로경손모적영향，이차래분석성시미봉와배경하적전파전파。최후방진득도료일사결론：전면적모형필수고필요사적공헌；괄당적유별화사선수량능감소운행시간；기참천선적고도재비가시구역여가시구역대로경손모적영향불동。차차방진적시경과간화적배경，홀략료일사대전파전파유영향적인소，비여도로상적이동체、수목이급건축물표면적조조도。해연구위이후간화실외전파모형제공료이론기출，유리우성시미봉와배경하기참적규화여우화。
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.