轨交时变多普勒信道的FPGA仿真

FPGA-Based Simulation of Time-varying Doppler Channel in Rail Transit

LTE技术在城轨车地无线通信中正在逐步替代WLAN技术,针对验证LTE性能所需的信道物理仿真平台的研发需求,建立了一个隧道环境中时变多普勒Jakes信道模型,提出了基于乘性扩展因子且用FPGA实现的信道仿真方案,设计了时变多普勒信道和希尔伯特变换滤波器,并在Xilinx公司的Virtex-6系列FPGA开发平台上实现。Modelsim和MATLAB的联合仿真结果验证了该方案的可行性,满足隧道下高速移动中信道特征的统计特性,可用于测试车地无线通信系统。

This paper establishes a time-varying Doppler Jakes channel model and proposed a FPGA channel simulation scheme based on the concept of multiplicative expansion factor,mainly focused on designing time-varying Doppler channel model and Hilbert transform filter.Finally,the scheme is implemented based on FPGA produced by Xilinx Virtex-6 series development platform.