无线通信中的快时变信道建模

Fast Time-Varying Channel Modeling of Wireless Communication

在高速移动环境下,无线通信信道会发生快速变化,若不能适应这种变化,通信系统性能将会受到严重影响,极大降低信息传输的速度和质量.因此,分析现有通信模型的不足,建立新的数学模型,对提升信道容量、增加信息传输速率和降低误码率会有很好的促进作用.本文针对无线通信中的快时变信道,采用了基扩展模型(CE-BEM、DPS-BEM)进行信道参数模拟,并用Jakes瑞利衰落信道模型进行信道衰落的仿真.最后,在考虑加性高斯白噪声的情况下,进行输入信号的数字调制及解调模拟,研究信噪比(SNR)与误比特率(BER)之间的关系.仿真结果表明:所建模型降低了实测数据量,并且能够对快时变信道进行准确估计.

In high-speed mobile environment, wireless communication channel will change rapidly, if the communication system can＇t adapt to this change, it＇s performance will be severely affected. The speed and quality of information transmission will greatly reduce. Therefore, it will have an positive effect on-improving channel capacity, increasing the information transmission rate and reducing the error rate that analyzing the shortage of the existing communication model and establishing a new mathematical model. This paper study fast time-varying channel of wireless communication, use the basis expansion model （CE- BEM, DPS-BEM） to simulate channel parameters and Jakes Rayleigh fading channel model to simulate channel fading. Finally, in the case of considering the additive white gaussian noise ,this paper simulate the digital modulation and demodulation of input signal, study the relationship between the signal-to-noise ratio （SNR） and the bit error rate （BER）. The simulation results show that the model reduces the amount of measured data and it can be to accurately estimate the fast time varying channel.