Cognitive radio with spectrum sensing for future networks

Research output: Chapter in Book / Conference PaperChapter

Abstract

Traditionally, the radio frequency spectrum (RFS) is divided into frequency bands and regulated in most countries by their governments. Each country has a spectrum management process for allocating the frequency bands to licensed users based on technical and economic aspects. Although each country is independently allocating its RFS, governments regulate their RFSs in compliance with international and regional standards. In general, RFS bands are statically allocated as licensed or unlicensed. Each licensed band is strictly assigned to a licensed user. On the other hand, an unlicensed RFS band can be accessed and shared freely by anyone within some transmission constraints. Therefore, unlicensed bands are in high demand as many wireless technologies and radio devices are designed to work in these free RFS bands. The industrial, scientific, and medical (ISM) bands are well-known examples of unlicensed RFS bands that include the frequency bands 902-928 MHz, 2400-2483.5 MHz, and 5725-5850 MHz. These bands are widely used, especially by wireless devices and systems based on Wi-Fi and Bluetooth communication technologies, under several specific regulations regarding operational requirements, such as power transmission and antenna gain (Cui and Weiss, 2013). As a result of regulation for the RFS bands, many licensed RFS bands are underutilized, in terms of frequency, time, and location, as found by several surveys on RFS occupancy conducted in different regions around the world (Barnes et al., 2013: Palaios et al., 2013: SiXing et al., 2012). In the near future, current RFS regulations may not be able to handle the rapidly growing usage of wireless communication technologies for various applications with highly expected increases in transmission data rate requirements. Therefore, the wireless research community and RFS regulatory organizations face the challenges of achieving high utilization of the overall RFS and need to overcome capacity scarcity in high-demand frequency bands. To overcome these challenges, there will most likely be innovative wireless technologies and revisions of the RFS regulations (Masonta et al, 2013).
Original languageEnglish
Title of host publicationNetworks of the Future: Architectures, Technologies, and Implementations
EditorsMahmoud Elkhodr, Qusay F. Hassan, Seyed A. Shahrestani
Place of PublicationU.S.
PublisherCRC Press
Pages3-23
Number of pages21
ISBN (Print)9781498783972
Publication statusPublished - 2018

Keywords

  • cognitive radio networks

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