高速铁路移动通信系统WINNER信道性能分析

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

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。

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.