Koçak, FatihÇelebi, H.Gezici, SinanQaraqe, K. A.Arslan, H.Poor, H. V.2016-02-082016-02-082009-12http://hdl.handle.net/11693/28636Date of Conference: 13-16 Dec. 2009Conference name: 3rd IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, CAMSAP 2009In 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. © 2009 IEEE.EnglishCognitive radioCramer-Rao lower boundDiversityMaximum-likelihoodTime delay estimationAsymptotic optimalityCognitive radioCramer Rao lower boundON timeSimulation resultStep timeTheoretical limitsTheoretical resultTime delay estimationCognitive systemsComputational complexityCramer-Rao boundsEstimationMaximum likelihood estimationRadioRadio systemsSensorsTechnical presentationsTime delayConference Paper10.1109/CAMSAP.2009.5413247