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Maximum likelihood differential sequence estimation of DS-UWB.

机译：DS-UWB的最大似然差分序列估计。

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摘要

Direct Sequence Ultra-wideband (DS-UWB) technology is a high potential candidate for the next generation of wireless short range high speed communications. In the IEEE 802.15.3a DS-UWB proposal, the classical Rake receiver will suffer severe performance degradation due to the abundant intersymbol interference (ISI) in the wireless UWB channels. A novel sequence detection technology referred as maximum likelihood differential sequence estimation (MLDSE) algorithm is proposed to be an alternative to the classical Rake receive for the DS-UWB scheme in the thesis. The MLDSE algorithm performs both functions of the maximum likelihood sequence estimation (MLSE) equalization and multiple symbols differential detection (MSDD) reception by a modified Viterbi algorithm (VA). Therefore the MLDSE receiver has the simplicity of the MSDD reception and the optimal performance of the MLSE equalization in the ISI and AWGN channels. The performance bound of the MLDSE algorithm is derived for the M-DPSK signals in the thesis. The feasibility of the proposal is also considered and analyzed in the thesis. The resource needed by Viterbi algorithm can be reduced greatly by integrating the decoding process of direct sequence encoding into the MLDSE algorithm. An adaptive joint data and channel estimation strategy is proposed to simulate the MLDSE receiver performance in the real UWB channels. The simulations demonstrate the superiority of the MLDSE receiver to the ideal Rake receiver in the UWB channels.
机译：直接序列超宽带（DS-UWB）技术是下一代无线短距离高速通信的高潜力候选者。在IEEE 802.15.3a DS-UWB提议中，由于无线UWB信道中存在大量符号间干扰（ISI），传统的Rake接收机将遭受严重的性能下降。本文提出了一种新的序列检测技术，称为最大似然差分序列估计（MLDSE）算法，作为DS-UWB方案经典Rake接收的一种替代方法。 MLDSE算法通过修改的维特比算法（VA）执行最大似然序列估计（MLSE）均衡和多符号差分检测（MSDD）接收这两个功能。因此，MLDSE接收机在ISI和AWGN信道中具有MSDD接收的简便性和MLSE均衡的最佳性能。本文针对M-DPSK信号推导了MLDSE算法的性能界限。本文还考虑并分析了该方案的可行性。通过将直接序列编码的解码过程集成到MLDSE算法中，可以大大减少Viterbi算法所需的资源。提出了一种自适应联合数据和信道估计策略，以模拟实际UWB信道中的MLDSE接收机性能。仿真证明了MLDSE接收器在UWB信道中优于理想的Rake接收器。

著录项

  • 作者

    Huang, Yinggan.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 144 p.
  • 总页数 144
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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