TY - JOUR
T1 - Fundamental limits on time delay estimation in dispersed spectrum cognitive radio systems
AU - Gezici, Sinan
AU - Celebi, Hasari
AU - Poor, H. Vincent
AU - Arslan, Huseyin
N1 - Funding Information:
H. V. Poor is with the Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA (e-mail: [email protected].) This work was supported in part by the European Commission in the framework of the FP7 Network of Excellence in Wireless COMmunications NEWCOM++ (contract no. 216715), and in part by the U. S. National Science Foundation under Grants ANI-03-38807 and CNS-06-25637. Digital Object Identifier 10.1109/T-WC.2009.080104
Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2009/1
Y1 - 2009/1
N2 - 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.
AB - 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.
KW - Carrier frequency offset (CFO)
KW - Cognitive radio
KW - Cramer-Rao lower bound (CRLB)
KW - Dispersed spectrum utilization
KW - Time delay estimation
UR - http://www.scopus.com/inward/record.url?scp=61349167939&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=61349167939&partnerID=8YFLogxK
U2 - 10.1109/T-WC.2009.080104
DO - 10.1109/T-WC.2009.080104
M3 - Article
AN - SCOPUS:61349167939
SN - 1536-1276
VL - 8
SP - 78
EP - 83
JO - IEEE Transactions on Wireless Communications
JF - IEEE Transactions on Wireless Communications
IS - 1
M1 - 4786484
ER -