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采用幂形式衰减模型和建立的抛物线型非线性相位模型分别研究了超宽带脉冲信号在频域中发生的幅度失真和相位失真,分析了超宽带信道的频率色散特性对脉冲信号波形产生的影响。仿真结果表明,传播信道中物体的边缘折射产生的频率依赖特性较强,引起的脉冲幅度失真较大;收发天线较小的非线性相位响应,也会导致较大的波形畸变。因此,在实际的超宽带信道建模时应根据实际环境考虑超宽带信道的频率色散特性。
The exponential decay model and the established parabolic nonlinear phase model are respectively used to study the amplitude distortion and phase distortion of the UWB pulse signal in the frequency domain. The influence of the UWB channel frequency dispersion on the waveform of the UWB pulse signal is analyzed. The simulation results show that the edge-dependent refraction of the object in the propagation channel has a strong frequency dependence and causes a large pulse amplitude distortion. The smaller nonlinear phase response of the transmitting / receiving antenna also leads to larger waveform distortion. Therefore, in the actual modeling of UWB channels, the frequency dispersion characteristics of UWB channels should be considered according to the actual environment.