Fundamental limits on time delay estimation in dispersed spectrum cognitive radio systems

Authors:
Sinan Gezici;Hasari Celebi;H. Vincent Poor;Huseyin Arslan
Affiliations:
Department of Electrical and Electronics Engineering, Bilkent University, Bilkent, Ankara, Turkey;Department of Electrical Engineering, University of South Florida, Tampa, FL;Department of Electrical Engineering, Princeton University, Princeton, NJ;Department of Electrical Engineering, University of South Florida, Tampa, FL
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

In this paper, fundamental limits on time delay estimation are studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. First, a generic Cramer-Rao lower bound (CRLB) expression is obtained in the case of unknown channel coefficients and carrier-frequency offsets (CFOs) for cognitive radio systems with dispersed spectrum utilization. Then, various modulation schemes are considered, and the effects of unknown channel coefficients and CFOs on the accuracy of time delay estimation are quantified. Finally, numerical studies are performed in order to verify the theoretical analysis.