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中文摘要：
给出了直扩超宽带（DS—UWB）信号模型，详细分析了DS—UWB信号的循环平稳性和利用谱冗余估计码片宽度的方法。最后，严格推导出了DS—UWB信号的循环谱密度函数。仿真实验显示：DS—UWB信号具有循环平稳性，由于它的单脉冲时域波形不同，它的循环谱密度函数和传统的脉幅调制PAM信号有很大的不同；在较低信噪比时，码片宽度能够完全准确地估计出来。
英文摘要：
In this paper, the model of DS-UWB signal is given, and the analysis of its cyclostationarity is described in detail, and the method of the chip interval estimation is explained using spectral redundancy. In the end, the spectral density of DS- UWB signal is given in this paper. The simulation results show that the DS-UWB signal exhibits cyelostationarity, and the spectral density of it is not the same as traditional PAM signal in terms of the difference of the waveform in time domain that are used in two modulated signals, and the parameters of chip interval can be truly estimated on rather low signal to noise ratio.
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