基于窗函数的Chirp-UWB信号研究  

Study on Chirp-UWB Signal Reshaped by Window Function

作　　者：石燚[1] 陈光[1] 吴士云[1] 

机构地区：[1]东华大学信息科学与技术学院,上海201620

出　　处：《通信技术》2010年第6期43-46,共4页Communications Technology

摘　　要：与目前普遍研究的超宽带通信系统中所使用的高斯脉冲波形不同,线性Chirp信号具有良好的自相关性和高处理增益,能够更好地抵抗窄带干扰和多普勒频移。由于目前研究的线性Chirp信号普遍采用的方波包络,经过匹配滤波之后输出的sinc波形中,部分能量泄露到旁瓣中去,从而影响判决的精确度。选取了四种窗函数,经过窗函数处理之后的线性调频信号能有效地降低旁瓣的幅度,从而提高信号传输的能量利用率。通过仿真发现这种经过加窗处理之后的线性Chirp信号和方波包络的线性Chirp信号相比,在高斯噪声信道下具有更好的抗噪声性能。Distinct from the orthodox Gaussian pulse prevalently used in ultra-wideband system,the linear chirp signal is of good autocorrelation and high processing gain,and fairly resistant to narrow-band interference and doppler effect.For the rectangular-wave envelope is usually adopted in the traditional linear chirp signal,a part of energy in the time domain signal output from the receiver match filter,has leaked into the side-lobe,thus affecting the accuracy of sampling judge.The four window functions are introduced to resist the amplitude level of side-lobe,and thus to raise the utilization ratio of transmission energy.The simulation result indicates that the reshaped linear Chirp signal has better performance as compared with linear Chirp signal of the rectangular-wave envelope.

关 键 词：超宽带 线性调频 窗函数 旁瓣抑制 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]