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中文摘要：
经过密集多径信道的直接序列超宽带（DS-UWB）信号形式变得非常复杂,这给信号的伪随机（PN）序列周期的盲估计带来了困难。基于信号功率谱二次处理,对信号的功率谱进行估计,然后将估计的功率谱作为输入再求取功率谱,最后得到的二次谱就会在接收的DS-UWB信号的PN序列周期的整数倍处得到一序列的尖峰脉冲,通过估计这些脉冲的间距就可以得到PN序列周期的估计。推导得出的接收的DS-UWB信号的二次谱的表达式表明了该方法的可行性,同时为了增强估计性能,使用了二次谱平均累积方法。仿真实验验证了该方法能够在较低的输入信噪比条件下良好地工作。
英文摘要：
The direct sequence ultra- wideband（ DS- UWB） signal through complicated, which makes the blind estimation of the pseudo- random （PN） the muhipath channel is sequence period for the DS- UWB signal difficult. Based on the reprocessing of the power spectrum of signal,the power spectrum of the received signals is estimated, then the estimated power spectrum is taken as input signals and its power spectrum is computed again. Finally,a sequence of peak pulses with interval will appear,which equates to the pseudo- random sequence period of the DS- UWB signal,and so the estimation of the pseudorandom sequence period can be realized through estimating the intervals. The expression of the reprocessed power spectrum can reveal the feasibility of the method. At the same time, in order to enhance the estimation performance, average accumulant method is used. The simulation results show that the proposed method can work well at lower signal-to- noise ratio （SNR）.
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