Title :
Time delay estimation in cognitive radio systems
Author :
Kocak, Fatih ; Celebi, Hasari ; Gezici, Sinan ; Qaraqe, Khalid A. ; Arslan, Huseyin ; Poor, H. Vincent
Author_Institution :
Dept. of Electr. & Electron. Eng., Bilkent Univ., Bilkent, Turkey
Abstract :
In cognitive radio systems, secondary users can utilize multiple dispersed bands that are not used by primary users. In this paper, time delay estimation of signals that occupy multiple dispersed bands is studied. First, theoretical limits on time delay estimation are reviewed. Then, two-step time delay estimators that provide trade-offs between computational complexity and performance are investigated. In addition, asymptotic optimality properties of the two-step time delay estimators are discussed. Finally, simulation results are presented to explain the theoretical results.
Keywords :
cognitive radio; communication complexity; delays; maximum likelihood estimation; cognitive radio systems; computational complexity; optimal maximum likelihood time delay estimation; time delay estimation; two-step time delay; Bandwidth; Cognitive radio; Computational complexity; Computational modeling; Delay effects; Delay estimation; Frequency diversity; Frequency estimation; Maximum likelihood estimation; USA Councils; Cognitive radio; Cramer-Rao lower bound; diversity; maximum-likelihood; time delay estimation;
Conference_Titel :
Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP), 2009 3rd IEEE International Workshop on
Conference_Location :
Aruba, Dutch Antilles
Print_ISBN :
978-1-4244-5179-1
Electronic_ISBN :
978-1-4244-5180-7
DOI :
10.1109/CAMSAP.2009.5413247
