基于MATLAB软件的无线信道“指纹”特征建模

The Wireless Channel “Fingerprint” Feature Modeling Based on MATLAB Software

本文针对移动通信中的无线信道特征进行综合分析,通过运用Matlab软件求解出离散线性时变系统以及滤波器的相关参数作为无线信道最主要的特征。同时,提取了多径时延扩展、Doppler扩展以及角度扩展等重要特征指标。因此,本文从离散线性时变系统的信道特征、时间、频率、空间四个维度分别提取了无线信道的信道系数、多径时延扩展(相干带宽)、Doppler扩展(相干时间)以及角度扩展(相干距离)四个特征指标,较为完整地刻画出了无线信道的“指纹”特征并具有实际的物理意义。

According to the wireless channel characteristics of the mobile communication, this paper took it into comprehensive analysis, using the MATLAB software to solve the channel parameters of the discrete linear system and filter parameters as the main feature for wireless channel. Then the multipath time delay spreading, angle spreading and Doppler spreading as the important charac-teristic indexes were extracted. Therefore, this article extracted the channel coefficients of the wireless channel, multipath time delay spreading (coherence bandwidth), Doppler spreading (coherent time) and angle spreading (coherence distance) from four dimensions of channel, time, frequency, and space of discrete linear time variable systems. These four indicators can depict the “fingerprint” feature of the wireless channel completely and show the actual physical significance.