For the timing acquisition in ultra-wideband systems, APA-UWB-AS ( Almost perfect sequence based PAM-TH-UWB timing acquisition) algorithm is proposed in the paper.Using the characteristics of the APS (Almost perfect sequence), the training sequence is designed in APS-UWB-AS scheme, with Least Square Estimation ( LSE) , the timing acquisition is done.The algorithm can realize timing acquisition at re-ceiver using simple correlation operations over the samples at the symbol rate, which reduces considerably im-plementation complexity and acquisition time.The acquisition performance in the multipath channel are also pro-vided in term s of simulation, When the training sequence cycle is 24,the scheme achieves a high synchroniza-tion performance and the bit-error-rate( BER) ,which is close to that of the case with perfect.%针对超宽带信号UWB（ ultra－wideband）的同步问题，提出基于近完美序列APS（ Almost per-fect sequence）的脉冲幅度调制PAM的同步捕获算法APA－UWB－AS。 APA－UWB－AS算法利用APS的特性，设计一种训练序列，并结合最小二乘算法LS获取PAM－UWB的同步。在实施过程中，APA－UWB－AS算法只需以比特速率采样，再进行简单的相关运算，从而简单了系统，降低系统的运算量。针对密集多径信道建立仿真模型，仿真结果表明提出的APA－UWB－AS算法能够快速的获取同步，当训练序列周期为24时，具有良好的同步估计的均方误差MSE和系统误码率，并逼近理想同步的环境下的误码率。
展开▼
