超宽带信道的频率色散特性对脉冲波形的影响  

Influences of Frequency Dispersive Characteristics for Ultra-wideband Channels on Pulse Waveform

作　　者：王艳芬[1] 杨海波[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《通信技术》2010年第6期90-92,95,共4页Communications Technology

摘　　要：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 distortion of the amplitude and phase of UWB pulse signals are respectively studied by using the damped exponential model and parabolic nonlinear phase models.And the influences of the frequency dispersive characteristics for ultra-wideband channels on the pulse waveform are analyzed.Simulation results indicate that the diffraction by an edge of the object could produce fairly strong frequency-dependence,thus causing fairly large distortion of the pulse amplitude,and the small nonlinear phase response of transmission and receiving antenna could also cause fairly large distortion of the waveform.Therefore,for the actual UWB channel modeling,the frequency dispersion of UWB channel should be considered in accordance with the actual environment.

关 键 词：超宽带 频率依赖 色散信道 波形失真 

分 类 号：TN929.5[电子电信—通信与信息系统]