Title page for etd-0723104-182000


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URN etd-0723104-182000
Author Yan-Lun Wang
Author's Email Address No Public.
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Department Electrical Engineering
Year 2003
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Performance Analysis of Improved Selective-Rake on Ultra-Wideband Channels
Date of Defense 2004-07-08
Page Count 115
Keyword
  • Selective-Rake
  • CLEAN Algorithm
  • Impulse Radio
  • Wavelet Transform
  • Ultra-Wideband
  • Abstract The Ultra-Wideband (UWB) communication technology has been extensively attended in recent years. In this thesis, we propose the improved selective-Rake receiver and analyze the performance on UWB channels. The UWB transmission channels are modeled with statistical methods and its fading characteristics are discussed. Different impulse radio properties for the UWB communication system are analyzed. The system performance and design complexity issues of selective-Rake receiver (SRake) are studied. Rake receiver has difficulties achieving desired system performance in the dense multipath environment. The main ideas of SRake receiver are to obtain the SNR level on known multipath channel and to determine the desired number of Rake fingers. Matched filters and maximum likelihood detectors are utilized in the implementation of the SRake to estimate the signal time delay. The CLEAN algorithm is then used in selecting the paths with relatively high energy. Furthermore, we also propose a noise cancellation scheme for performance improvement in the SRake receiver. In the noise cancellation scheme, the multiresolution property of wavelet transform is used for filtering the noise interference caused by the rapid fluctuation factor. In addition, a two-stage search is combined with the original CLEAN algorithm to increase the accuracy of path selection. From our simulation results on the UWB channels, the improved SRake receiver, with noise cancellation and two-stage search, indeed has high SRake output SNR and better path accuracy than the original SRake receiver.
    Advisory Committee
  • Shiunn-Jang Chern - chair
  • Hsin-Hsyong Richard, Yang - co-chair
  • Wen-Jye Huang - co-chair
  • Chin-Der Wann - advisor
  • Files
  • etd-0723104-182000.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2004-07-23

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