高速移动车车信道建模与系统仿真

High Mobility Vehicle-to-Vehicle Channel Model and System Simulation

高速移动的车载环境与传统蜂窝网的无线传输环境相比,主要的不同点在于存在很大的多普勒频移,并且无线电波传输环境、传输路径是不同的,成为智能交通领域影响通信性能的因素。为此提出了嵌入式抽头延迟线模型,采用傅里叶反变换的方法实现符合不同多普勒功率谱密度的瑞利或莱斯分布衰落,用简单抽头延迟线方法拟合每个抽头,最后采用嵌入式抽头延迟线模型实现三种车车信道。通过MATLAB软件完成了三种VTV信道的建模,仿真结果可以反映信道的高速移动性。基于IEEE 802.11p协议搭建了系统仿真环境,仿真结果表明,高速公路相向行驶信道为最恶劣信道,系统误比特率最高,并且误比特率随着数据包长度的增加而增加。

This paper proposes an embedded tapped delay line model, utilizes IDF-F method to simulate Rayleigh fading or Rice fading path with different Doppler power spectral densities, then fits the tap with the simulated paths, at last implement three VTV channels based on the embedded tapped delay line model. The three VTV channels are es- tablished by MATLAB and the simulation result reflects the high mobility of VTV channel. In order to test the system perform with different SNRs and different data packet lengths on the three V2V channels, the paper establishes the testbench based on IEEE 802. 1 lp. The result shows that the bit error rate in the V2V -Expressway oncoming chan- nel is the highest among all the three channels. In the mean while, the bit error rate increases with the length of data packets in the V2V -Expressway oncoming channel.