一种可变搜索步长的UWB同步捕获算法

A Timing Acquisition Algorithm with flexible search step sizes for UWB Signals

本文在相关接收机结构的基础上,引入噪声模板,提出了一种可变搜索步长的同步捕获算法,并对该算法的估计性能及其对系统误码率影响作了仿真分析。该算法可以在数据辅助下利用训练序列的符号特性使用很短的训练序列完成捕获,同时可以通过改变搜索步长来实现不同精度的同步要求。仿真结果表明该算法能够有效地捕获密集多径信道下极窄脉冲的能量,并且降低了运算复杂度和同步捕获时间,应用十分灵活。

Based on the framework of correlator, by introducing the concept of Timing with Dirty Templates, this paper presents a timing acquisition algorithm with flexible search step sizes for TH-UWB signals and simulates the estimation and BER performance of this algorithm. In this scheme, acquisition can be achieved using the symbol characteristic of fewer training sequence under the data-aided （DA） model. At the same time, it can satisfy different precision demand by altering the search step size. Simulation results indicate that the algorithm is able to increase the energy captured in the dense multipath channel and reduce considerably implementation complexity and acquisition time, which can be applied flexibly.