高铁定向天线同向辐射覆盖下的性能分析  

Performance Analysis of Directional Antenna for High-speed Railway under Synthetic Radiation Coverage

作　　者：闫莉[1] 方旭明[1] 

机构地区：[1]西南交通大学移动通信省重点实验室

出　　处：《铁道通信信号》2013年第11期50-53,共4页Railway Signalling & Communication

基　　金：国家自然科学基金重点项目(61032002)

摘　　要：通过理论分析和仿真发现,高铁移动通信网络在定向天线同向覆盖模式下,切换重叠区对于源基站是小区边缘,但对于目标基站却是信号最强的区域,即列车从弱信号区切换到强信号区不存在乒乓效应,可以提高车载台越区切换触发率。由于这种覆盖模式是同向辐射,列车在穿越切换区和基站时都不存在多普勒突跳,因此可降低移动通信系统的传输误码率。Through theoretical analysis and simulation we find the overlapping area for the source base station is a weak field, while that for the target base station is a strong area in the case of directional antenna radiating to the same direction compared to the traditional overlay in high-speed mobile communication networks, and which can avoid the ping pong effect and increase the probability of handover success. Because the radiation pattern is the same, there is no Doppler jump when a train crosses the overlapping area and base stations, thus reducing the transmission error rate of mobile communication systems.

关 键 词：覆盖模式 辐射 切换 多普勒突跳 

分 类 号：TN929.5[电子电信—通信与信息系统]