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本文提出了一种新的基于能量窗的直扩超宽带系统码片同步方法,通过设计具有重复特性的码来提高能量窗的信噪比,从而可以较为准确地获得码片同步,并将窗口中的信息作为接收端本地信号与接收信号进行匹配接收,这样可以在未知接收信号相位的情况下有效地接收多径能量,提高接收信噪比。在完成码片同步之后再进一步进行PN码的相位同步,这里以线性搜索为例分析得到超宽带信号总的平均同步时间,并与现有的超宽带同步方案进行了比较,新方案将信号捕获分成两部分完成,大大降低了超宽带信号捕获时间。
In this paper, we propose a new method of chip synchronization based on energy window in DSSS UWB system. By designing codes with repetitive characteristics to improve the signal-to-noise ratio of the energy window, the chip synchronization can be obtained more accurately and the window In the receiving end of the local signal and the received signal to receive matching, so that the phase of the unknown received signal effectively receive multi-path energy to improve the received signal-to-noise ratio. After completing the chip synchronization, the PN code is further synchronized with the phase of the PN code. Here, an example of the linear search is used to analyze the total average synchronization time of the UWB signal, and compared with the existing UWB synchronization scheme. The new scheme compares the signal acquisition Divided into two parts, greatly reducing the ultra-wideband signal capture time.