Theoretical limits on time delay estimation for ultra-wideband cognitive radios
Author
Gezici, Sinan
Celebi, H.
Arslan, H.
Poor, H. V.
Date
2008-09Source Title
Proceeedings of The 2008 IEEE International Conference on Ultra-Wideband, ICUWB 2008
Publisher
IEEE
Pages
177 - 180
Language
English
Type
Conference PaperItem Usage Stats
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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