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Author Tawk, Y. ♦ Costantine, J. ♦ Christodoulou, C.G.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1990
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Tutorials ♦ Wideband ♦ Broadband antennas ♦ Radio frequency ♦ Narrowband ♦ Antenna measurements ♦ Sensors ♦ wideband antennas ♦ Cognitive radio ♦ filters ♦ interweave ♦ reconfigurable antennas ♦ software-defined radio ♦ underlay
Abstract This paper discusses the fundamental principles of a cognitive-radio RF system. The key points required to achieve a true cognitive-radio device are outlined. The operation of a cognitive-radio system is mainly divided into two tasks. In the first task, a cognitive-radio device searches and identifies any part of the spectrum that is not occupied. The second task consists of achieving an optimal mode of communication by allocating the appropriate channels to be used. In this paper, the RF requirements required to operate a cognitive-radio device are detailed. Such a device can adopt one of two scenarios of a cognitive-radio system: the “interweave” or “underlay” mode of operation. For both scenarios, a cognitive cycle is followed. This cycle consists of the following four steps: (1) observe, (2) decide, (3) act, and (4) learn. A cognitive-radio engine is responsible for managing and integrating these four functions together into a single cognitive-radio device. In this tutorial, the realization of the four functions of a cognitive-radio cycle are detailed for both types of cognitive radio, and various RF front-end examples are presented and discussed.
Description Author affiliation :: Electr. Eng. Dept., California State Univ., Fullerton, CA, USA
Author affiliation :: Configurable Space Microsyst. Innovations & Applic. Center (COSMIAC), Univ. of New Mexico, Albuquerque, NM, USA
ISSN 10459243
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2014-01-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 56
Issue Number 1
Size (in Bytes) 3.49 MB
Page Count 13
Starting Page 231
Ending Page 243


Source: IEEE Xplore Digital Library