多径超宽带系统修正自相关符号同步方案的实现

Symbol Timing with Modified Autocorrelation Scheme for UWB Systems

采用迭代修正的接收波形作为本地相关器的样本函数,给出了一种并行自相关符号定时同步的实现方法,该方法减少了由波形畸变带来的能量损失,加快了同步定时的收敛速度.信道模型以Intel提出的S—V为基础,探讨了超宽带信号在多径状态下,符号定时同步对误码率等性能的影响.仿真结果表明,与"多径超宽带系统同步时间在毫秒级"的结论不同,该电路可以在微秒级时间内实现准确、快速的同步.

A scheme of symbol timing is proposed, which is based on a modified parallel autocorrelation algorithm. By using the iteratively modified received signals as the local template of the match filter, the power losses caused by waveform distortion decreased. At the same time the acquisition convergence will get fast without complex estimation like RAKE. We analyze the effects of timing estimation error on bit error rate in the multipath environment. The simulations showed that the proposed method can find the symbol timing fast and accurately.