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      • Department of Electrical and Electronics Engineering
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      Theoretical limits on time delay estimation for ultra-wideband cognitive radios

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      Author
      Gezici, Sinan
      Celebi, H.
      Arslan, H.
      Poor, H. V.
      Date
      2008-09
      Source Title
      Proceeedings of The 2008 IEEE International Conference on Ultra-Wideband, ICUWB 2008
      Publisher
      IEEE
      Pages
      177 - 180
      Language
      English
      Type
      Conference Paper
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      Abstract
      In this paper, theoretical limits on time delay estimation are studied for ultra-wideband (UWB) cognitive radio systems. For a generic UWB spectrum with dispersed bands, the Cramer-Rao lower bound (CRLB) is derived for unknown channel coefficients and carrier-frequency offsets (CFOs). Then, the effects of unknown channel coefficients and CFOs are investigated for linearly and non-linearly modulated training signals by obtaining specific CRLB expressions. It is shown that for linear modulations with a constant envelope, the effects of the unknown parameters can be mitigated. Finally, numerical results, which support the theoretical analysis, are presented. © 2008 IEEE.
      Keywords
      Carrier frequency offset (CFO)
      Cramer-rao lower bound (CRLB)
      Dispersed spectrum utilization
      Time delay estimation
      Ultra-wideband (UWB) cognitive radio
      Civil aviation
      Cognitive systems
      Communication channels (information theory)
      Control theory
      Cramer-Rao bounds
      Electric network analysis
      Frequency allocation
      Frequency bands
      Frequency estimation
      Modulation
      Radio
      Radio systems
      Sensor networks
      Telecommunication systems
      Time delay
      Wireless telecommunication systems
      Permalink
      http://hdl.handle.net/11693/26798
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ICUWB.2008.4653380
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      • Department of Electrical and Electronics Engineering 3524
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