Theoretical limits on time delay estimation for ultra-wideband cognitive radios
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2008-09
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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.
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Proceeedings of The 2008 IEEE International Conference on Ultra-Wideband, ICUWB 2008
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IEEE
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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
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Language
English