Title page for ETD etd-06252003-001303


Type of Document Master's Thesis
Author McKinstry, David R.
Author's Email Address dmckinst@vt.edu
URN etd-06252003-001303
Title Ultra-wideband Small Scale Channel Modeling and its Application to Receiver Design
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Buehrer, Richard Michael Committee Chair
Reed, Jeffrey Hugh Committee Member
Sweeney, Dennis G. Committee Member
Keywords
  • Rake receiver
  • channel model
  • interference rejection
  • ultra-wideband
  • UWB
  • energy detector
Date of Defense 2003-06-17
Availability unrestricted
Abstract
Recently, ultra-wideband (UWB) technology based on the transmission of short duration pulses has gained much interest for its application to wireless communications. This thesis covers a range of topics related to the analysis of indoor UWB channels for communications and to system level design issues for UWB receivers. Measurement based UWB small scale modeling and characterization efforts as well as UWB communications system analysis and simulation are presented.

Relevant background material related to UWB communications and wireless channel modeling is presented. The details of the small scale channel modeling work, including statistical characterization and potential models, are discussed. A detailed analysis of the CLEAN algorithm, which was used to process all the measurement data, is also given, and some limitations of the algorithm are presented.

The significance of the channel impulse response model chosen for the simulation of UWB communications systems is also evaluated. Three traditional models are found to be useful for modeling NLOS UWB channels, but not LOS channels. A new model for LOS UWB channels is presented and shown to represent LOS channels much more accurately than the traditional models.

Receiver architectures for UWB systems are also discussed. The performance of correlation receivers and energy detector receivers are compared as well as Rake diversity forms of each of these types to show tradeoffs in system complexity with performance. Interference to and by UWB signals is considered. A narrowband rejection system for UWB receivers is shown to offer significant system improvement is the presence of strong interferers.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  CLEAN_2_path_frac_BW_2_opp_pol.gif 353.48 Kb 00:01:38 00:00:50 00:00:44 00:00:22 00:00:01
  CLEAN_2_path_frac_BW_2_same_pol.gif 349.78 Kb 00:01:37 00:00:49 00:00:43 00:00:21 00:00:01
  CLEAN_2_path_frac_BW_half_opp_pol.gif 371.00 Kb 00:01:43 00:00:53 00:00:46 00:00:23 00:00:01
  CLEAN_2_path_frac_BW_half_same_pol.gif 371.98 Kb 00:01:43 00:00:53 00:00:46 00:00:23 00:00:01
  CLEAN_2_path_funky_pls_opp_pol.gif 392.81 Kb 00:01:49 00:00:56 00:00:49 00:00:24 00:00:02
  CLEAN_2_path_funky_pls_same_pol.gif 392.65 Kb 00:01:49 00:00:56 00:00:49 00:00:24 00:00:02
  CLEAN_iter.gif 37.28 Kb 00:00:10 00:00:05 00:00:04 00:00:02 < 00:00:01
  McKinstry_Thesis.pdf 1.97 Mb 00:09:08 00:04:42 00:04:06 00:02:03 00:00:10

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