高速铁路移动通信系统WINNER信道性能分析

在对无线信道模型和铁路电波传播环境研究基础上,提出WINNER D2a信道模型是高速铁路无线信道的合适选择,并建立了高速铁路移动通信系统WINNER D2a信道半实物仿真平台。与传统的计算机仿真相比,半实物仿真平台具有更高的仿真性和实时性,并能在实验室对设备在高速铁路上的性能进行测试。在仿真平台上对不同移动速度、同频干扰、接收电平条件下的高速铁路移动通信系统的性能进行了仿真。分析结果表明:移动速度和同频干扰对系统性能影响非常大,而接收电平则对性能没有明显影响。最后探讨了改善系统性能的技术措施。

Analysis on Performance of WINNER Channels of Mobile Communication System of High-speed Railway

On the basis of research of wireless channel models and the railway radio propagation environment,the WINNER D2a model is presented as an appropriate choice for the wireless channel for high-speed railways,and the WINNER D2a Hardware-in-the-Loop(HIL) simulation testbench is constructed for the mobile communication system.Compared to traditional computer simulation,the HIL simulation testbench can achieve higher accuracy and better real-time capability and test the on-line performance of high-speed railway equipment in aboratory.The relationship between the performance of the mobile communication system and different train speeds,co-channel interferences and received levels is simulated on the testbench.Simulation results show that train speeds and co-channel interferences make a tremendous impact on the performance of the mobile communication system whereas received levels show no obvious influence.Finally,some technical messures are proposed for improvement in system performance.