naa a22 4500 510793665 CHVBK 20180411083328.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11277-012-0759-3 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0759-3 Fast Primary User Detection during Ongoing Opportunistic Transmission in OFDM-based Cognitive Radio [Elektronische Daten] [Jaehoon Ko, Hyeonmok Ko, Cheeha Kim] Cognitive radio requires that a secondary user (SU) stops its transmission as soon as possible upon the arrival of a primary user (PU). In this paper, we propose a novel approach to quickly detect PUs while an SU transmission is in progress. The proposed method requires an SU transmitter to use OFDM to insert periodic zero-energy intervals in a selected subcarrier and to detect energy during each interval for PU detection. The length and periodicity of these intervals determine the performance of PU detection. We also discuss how to determine the energy detection threshold. Springer Science+Business Media, LLC., 2012 Cognitive radio nationallicence Spectrum vacation nationallicence Ko Jaehoon Department of Computer Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, 790-784, Pohang, Gyungbuk, Republic of Korea aut Ko Hyeonmok Department of Computer Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, 790-784, Pohang, Gyungbuk, Republic of Korea aut Kim Cheeha Department of Computer Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, 790-784, Pohang, Gyungbuk, Republic of Korea aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/4(2013-06-01), 1463-1471 0929-6212 70:4<1463 2013 70 11277 https://doi.org/10.1007/s11277-012-0759-3 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0759-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ko Jaehoon Department of Computer Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, 790-784, Pohang, Gyungbuk, Republic of Korea aut NATIONALLICENCE 700 1- Ko Hyeonmok Department of Computer Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, 790-784, Pohang, Gyungbuk, Republic of Korea aut NATIONALLICENCE 700 1- Kim Cheeha Department of Computer Science and Engineering, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, 790-784, Pohang, Gyungbuk, Republic of Korea aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/4(2013-06-01), 1463-1471 0929-6212 70:4<1463 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer