基于窗函数的Chirp-UWB信号研究

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。

Study on Chirp-UWB Signal Reshaped by Window Function

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 intro...