TD-LTE室外微蜂窝小区D频段电波传播特性研究

发布时间：2018-04-27 15:14

本文选题：分时长期演进标准 + 室外微蜂窝小区　；参考：《南京邮电大学》2015年硕士论文

【摘要】：分时长期演进标准是我国为应对高速数据通信业务的发展需求,根据长期演进标准并结合拥有自主知识产权的时分同步码分多址技术制定的。室外分时长期演进系统主要使用D频段(2.6GHz)进行组网规划,由于其组网频率较高,电波传播特性与2G、3G网络传播特性有所不同,而传播特性是无线网络规划与设计的基础,因此研究D频段电波传播特性对分时长期演进无线网络的规划和优化具有重要的理论意义和实用价值。本文利用入射及反弹射线/镜像法对室外微蜂窝小区D频段电波传播特性进行了仿真和分析。本文主要工作如下:(1)在传统射线管判收方法的基础上,从理论上提出了一种能有效提高计算效率、降低计算复杂度的射线管判收新方法。(2)利用已知文献的室外微蜂窝小区参数条件进行建模仿真,仿真结果与已知文献结果一致性良好,验证了入射及反弹射线/镜像法预测室外微蜂窝小区电波传播特性的可靠性和正确性。(3)仿真分析了微蜂窝住宅小区的电波传播特性,得到了接收功率分布、路径损耗等无线通信网络中重要的参数特性,视距和非视距传播条件下路径损耗的最大值分别为116.21d B和138.23d B,根据最大路径损耗可以计算小区覆盖范围。(4)比较了不同频率、不同天线高度及天线方向性对D频段电波传播特性的影响,仿真结果表明2.6GHz频段路径损耗比陆地移动通信典型频段900MHz高出十几分贝,损耗严重;天线高度对D频段电波传播特性影响不大;定向天线能更具有针对性的实现网络覆盖。(5)针对具有密集树木的典型校园环境进行建模仿真,重点研究校园密集树木对D频段电波传播特性的影响,仿真结果表明密集树木的遮挡使信号产生严重的衰减。同时还仿真比较了操场空旷地附近视距和非视距路径的传播特性。
[Abstract]:In order to meet the needs of the development of high-speed data communication service, the time-sharing and long-term evolution standard is formulated according to the long-term evolution standard and the time division multiple access (TDMA) technology with independent intellectual property rights. The outdoor time-sharing long term evolution system mainly uses D band 2.6GHz) to plan the network. Because of its high network frequency, the radio wave propagation characteristic is different from that of 2GN 3G network, and the propagation characteristic is the basis of wireless network planning and design. Therefore, it is of great theoretical significance and practical value to study the characteristics of D band radio wave propagation for the planning and optimization of time-sharing long term evolution wireless networks. In this paper, the D band wave propagation characteristics of outdoor microcellular cell are simulated and analyzed by incident and rebound ray / mirror method. The main work of this paper is as follows: (1) on the basis of the traditional method of judging the collection of ray tubes, a new method is proposed, which can effectively improve the efficiency of calculation. A new method of ray tube judgment and collection, which reduces the computational complexity, is proposed to model and simulate the outdoor microcellular cell parameters of known literatures. The simulation results are in good agreement with the known results. The reliability and correctness of the incident and rebound ray / mirror method for predicting the propagation characteristics of outdoor microcellular cell are verified. The simulation results show that the radio wave propagation characteristics of the microcellular residential area are analyzed, and the received power distribution is obtained. The most important parameter characteristics in wireless communication networks such as path loss are 116.21 dB and 138.23 dB under the condition of visual distance and non-line-of-sight propagation, respectively. According to the maximum path loss, the cell coverage can be calculated. The effects of antenna height and antenna directivity on the propagation characteristics of D band radio waves are studied. The simulation results show that the path loss in 2.6GHz band is more than ten decibels higher than that in typical 900MHz band of terrestrial mobile communication, and the loss is serious. Antenna height has little effect on the propagation characteristics of D band radio waves; directional antenna can more pertinently realize network coverage. (5) Modeling and simulation of typical campus environment with dense trees is carried out. The influence of dense trees on the propagation characteristics of D band radio waves is studied. The simulation results show that the dense trees can attenuate the signal seriously. At the same time, the propagation characteristics of sight distance and non-field of sight paths near the open area of playground are also simulated and compared.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5

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