为了更加精确地描述移动无线通信信道的时变多径特性,对传统的时变多径信道模型进行了改进,基于维纳过程将多径相位分量建模为时间变量,从理论上对经历时变多径信道的OFDM系统接收信号分量进行分析与计算,推导了系统的误码率,并对理论值与仿真结果进行了对比.结果表明:与传统信道模型相比,改进信道模型的衰落自相关谱和OFDM系统误码率与仿真结果更为相符,证实改进的信道模型能更准确地描述时变多径衰落信道. In order to describe the time-varying multipath characteristic of mobile wireless communication channel more accurately, the traditional time-varying multipath channel model is improved. Based on the Wiener process, the multipath phase component is modeled as a time variable. In theory, Compared with the traditional channel model, the result shows that the fading of the channel model from the traditional channel model is better than that of the traditional channel model The correlation spectrum and bit error rate of OFDM system are in good agreement with the simulation results. It is confirmed that the improved channel model can describe the time-varying multipath fading channel more accurately.