中文摘要：

为了在超宽带通信系统中，简单、快速地实现信号的同步捕获和信道估计，提出一种首先利用相关器粗略估计出有用信号的起始位置，然后采用最大似然估计准则实现同步捕获和信道估计的分步同步捕获方法。该方法既提高了估计精度，又有效降低了接收机的复杂度和处理时间。

英文摘要：

In order to implement timing acquisition and channel estimation simply and rapidly in UWB communications, this paper proposed a two-stage acquisition scheme. The first step was to approximately estimate the starting position of the useful signals by correlator,then employed a maximum likelihood criterion for achieving both timing acquisition and channel estimation. This method improves estimation accuracy, and also reduces complexity of receiver and operating time.