高速铁路环境下的无线信道建模与仿真

MODELLING AND SIMULATING RADIO CHANNEL IN HIGH-SPEED RAIL ENVIRONMENT

高铁环境下的信道建模是高铁通信系统设计的基础。利用沪杭高铁实测数据,在奥村模型的基础上给出高铁信道的大尺度衰落模型,在莱斯分布模型的基础上给出高铁信道的小尺度衰落模型。之后,对已构建的模型进行仿真,根据仿真结果,研究多普勒频移对信号的基本统计参数、功率谱等方面的影响。最后,通过自动频率补偿技术,解决了高铁中由于高速运动导致高铁通信系统误码率过高的问题。

Radio channel modelling in high-speed rail environment is the basis of HSR wireless communication system design.Making use of the measured data in HSR Line between Shanghai and Hangzhou,this paper proposes a large scale fading model on the basis of Okumura-Hata model and a small scale fading model on the basis of Ricean distribution model,both are for HSR radio channel.Then the simulations are done on the constructed models,and according to simulation results,the study is carried out in regard to the impacts of Doppler frequency offset on statistical parameters of signal and power spectrum of signal.Finally,we solve the problem in HSR by automatic frequency compensation technique that the HSR communication system has too high bit error rate incurred from high speed motion.