Theoretical limits on time delay estimation for ultra-wideband cognitive radios
Date
2008-09
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Source Title
Proceeedings of The 2008 IEEE International Conference on Ultra-Wideband, ICUWB 2008
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Publisher
IEEE
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Pages
177 - 180
Language
English
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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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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