Project reference Bg:DRILA 01/10, 17.04.2015/ Fr:Project №34281ZM
in the framework of the program PHC RILA 2015 funded by Fond “Nauchni izsledvania” to the Ministry of education and science, Bulgaria and Partnership Hubert Curien (PHC), Ministry of foreign affairs and international development, France, managed by CAMPUS France
Cognitive Radio (CR) is an emerging concept to increase spectrum usage efficiency by allowing a secondary user (SU) to access some licensed spectrum bands temporarily unoccupied by the primary user (PU). Two basic approaches to spectrum sharing have been considered: spectrum overlay and spectrum underlay. According to the spectrum overlay approach, the secondary users sense and identify unused frequency bands and use them for communication purposes. Thus, the secondary users (SU) are responsible for detecting the unused bands and they should vacate the spectrum as soon as the primary user begins its activities. The underlay approach imposes constraints on the secondary users' transmission power level, so that it operates below the noise floor of primary users. The study will focus on the implementation aspects of the overlay spectrum sharing. To determine the absence or presence of the primary user signals, several spectrum sensing techniques have been developed in literature; but, most of them are not yet implemented on real hardware platforms.
assoc. professor GALIA MARINOVA, Ph.d.
Institution: Department „Technology and management of communication systems“, Faculty of Telecommunications, Technical University-Sofia, 8, bul. „Saint Kliment Ohridski“, Sofia – 1000, Bulgaria
e-mail: gim@tu-sofia.bg
assoc. professor AMOR NAFKHA, Ph.d
Institution: Laboratory Signal, Communication & Embedded Electronics (SCEE) Centrale SUPELEC, 5 Avenue De La Boulaie CS 47601 IETR, Universite de Rennes 1 Campus Beaulieu - bât. 11D 263 ave. du General Leclerc CS 74205, 35042, Rennes, France
e-mail: amor.nafkha@supelec.fr
Galia Marinova
Associate professor, Ph.d.
Bulgaria
Zdravka Tchobanova
Assistant professor, Ph.d. student.
Bulgaria
Ognyan Chikov
Ph.d. student.
Bulgaria
Amor Nafkha
Associate professor, Ph.d.
France
Malek Naoues
Postdoc, Ph.d.
France
1) A. Nafkha, M. Naoues on Mobility France – Bulgaria,
26.07.2015 – 01.08.2015
Sofia, 2015
WORKSHOP ON PROJECT PHC RILA
IN TECHNICAL UNIVERSITY-SOFIA, SOFIA, BULGARIA, FACULTY OF TELECOMMUNICATIONS, DEPARTMENT TECHNOLOGY AND MANAGEMENT OF COMMUNICATION SYSTEMS, Room 1210
30.07.2015, 14.00-17.00
2) Galia Marinova and Zdravka Tchobanova on Mobility in SUPELEC France,
25.10.2015 - 01.11.2015
SECOND MEETING
USRP - based SDR for Cognitive Radio: Platform for Cooperative Spectrum Sensing and Primary User Localization
PHC RILA/ PSULO Project
Centrale Supélec-Campus de Rennes Room 318
27.10.2015 - 28.10.2015
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1. ZdravkaTchobanova, GaliaMarinova, Amor Nafkha, Implementation of a Energy Detection Based Cooperative Spectrum Sensing on USRP Platform for a Cognitive Radio Networks, AICT’2016, The Twelfth Advanced International Conference on Telecommunications, Valencia, Spain, 2016 (submitted)
Abstract — The paper describes a centralized cooperative spectrum sensing system, implemented on USRPs hardware platforms driven by the GNU Radio software. Spectrum sensing is realized by energy detection and a new block of energy detector with uncertainty is developed using GNU Radio out-of-tree implementation. A centralized scheme for cooperative spectrum sensing is applied and a hard global decision is taken in a fusion center which collects the local decisions from secondary users, selects those of them which will be taken for global decision estimation and performs classical decision fusion logic such as AND, OR, Majority rules. Based on measured data, the probabilities of detection for different SNRs are built for each secondary user and for different scenarios of cooperative sensing.
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