Theoretical limits on time delay estimation for ultra-wideband cognitive radios
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Date
2008Journal Title
Proceeedings of The 2008 IEEE International Conference on Ultra-Wideband, ICUWB 2008
Volume
2
Pages
177 - 180
Language
English
Type
Conference Paper
Metadata
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http://hdl.handle.net/11693/26798Abstract
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.
Published as
http://dx.doi.org/10.1109/ICUWB.2008.4653380Collections
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