PPM-UWB信号的GLRT同步捕获算法研究

提出了一种适合于PPM-UWB信号的基于广义似然比检测（GLRT）的同步捕获算法，首先采用了一种新颖的本地模板信号与接收信号进行滑动相关，得到符号速率的采样信号，然后通过精心设计训练序列的图案，利用GLRT实现信号时延估计．由于该算法采用了符号速率（几百兆赫兹）的采样信号，与传统的需要极高采样率（几吉赫兹）的同步算法相比，它极大地降低了系统的复杂度和运算量，同时也提高了捕获速度．通过在密集多径信道模型下，对PPM-UWB信号的同步捕获进行计算机仿真，仿真表明该算法能够快速有效地实现同步捕获．

A GLRT timing acquisition algorithm for PPM-UWB signals

A timing acquisition algorithm for PPM-UWB signals in data-aided mode based on the generalized likelihood ratio test(GLRT) is proposed in this paper. First,based on a novel correlation template,symbol-to-symbol sliding correlation was applied to generate samples at the symbol rate.Then,with a judiciously designed pattern of training sequences,time delay estimation was achieved by using the generalized likelihood ratio test(GLRT).Compared with a timing algorithm using an extra-high sampling rate(several GHz),the proposed algorithm reduces the complexity and computational efforts of the system considerably because the new algorithm takes samples at the symbol rate(several hundreds MHz).Simulations with dense multipath channels confirmed that the algorithm can achieve fast timing acquisition in a practical UWB environment.