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Non-coherent slot synchronization techniques for WCDMA systems

机译:WCDMA系统的非相干时隙同步技术

摘要

This Thesis investigates a host of new synchronization techniques for WCDMA. We assume the presence of more than one base station (BS) (multi-target) in the vicinity of the mobile station (MS), and consider the effects of multipath, Raleigh fading, and different carrier frequency offsets. Through the Thesis, we concentrate on the first stage of the three-stage cell search procedure which is slot synchronization. The slot synchronization stage has been always the most challenging stage since it deals with the largest amount of uncertainty in the cell search, and it determines the timing resolution to the other two stages. We also introduce the concept of using parallel code verification circuits to be added to the state of art pipelined techniques to yield better synchronization results. The received WCDMA synchronization codes are combined in different scenarios according to the proposed non-coherent synchronization technique. The results are compared with recent approaches of combining the WCDMA synchronization codes. The comparison reveals some improvements in the mean synchronization time for some of our rules herein. It also shows superiority of the new rules for different carrier frequency offsets especially at low signal to interference ratios.
机译:本文研究了许多用于WCDMA的新同步技术。我们假设移动站(MS)附近存在多个基站(BS)(多目标),并考虑了多径,罗利衰落和不同载波频率偏移的影响。通过论文,我们集中在三阶段小区搜索过程的第一阶段,即时隙同步。时隙同步阶段一直是最具挑战性的阶段,因为它处理小区搜索中的最大不确定性,并且确定其他两个阶段的时序分辨率。我们还介绍了将并行代码验证电路添加到现有流水线技术中以产生更好的同步结果的概念。根据所提出的非相干同步技术,将接收到的WCDMA同步码在不同情况下进行组合。将结果与组合WCDMA同步码的最新方法进行了比较。比较结果显示,本文中某些规则的平均同步时间有所改善。它还显示了针对不同载波频率偏移的新规则的优势,尤其是在低信噪比的情况下。

著录项

  • 作者

    Hassan Ahmed;

  • 作者单位
  • 年度 2008
  • 总页数
  • 原文格式 PDF
  • 正文语种 en
  • 中图分类

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