NDLI: Hybrid overlay/underlay MC-CDMA for cognitive radio networks with MMSE channel equalization

Content Provider	IEEE Xplore Digital Library
Author	Jasbi, F. So, D.K.C. Alsusa, E.
Copyright Year	2013
Description	Author affiliation: Sch. of Electr. & Electron. Eng., Univ. of Manchester, Manchester, UK (Jasbi, F.; So, D.K.C.; Alsusa, E.)
Abstract	Cognitive Radio (CR) aims to access the spectrum opportunistically mainly by two access strategies, overlay and underlay. Overlay can utilize the spectrum whenever the primary system is off. On the other hand, underlay can utilize the spectrum at any time with considering the interference limit of the primary system. However, by using hybrid methods and performing proper equalization technique, spectrum can be utilized more efficiently. In this paper, we propose a hybrid MC-CDMA system which utilizes the whole spectrum for underlay transmission rather than solely the occupied parts. Due to the interference rejection capability, MC-CDMA can minimize the interference from the Primary User (PU) and exploit more diversity. Furthermore, overlay utilizes the spectrum holes while maintaining orthogonality to the underlay by Orthogonal Variable Spreading Factor (OVSF) codes. Chip and symbol- level MMSE-based modified equalizers are proposed for the system and the underlay performance of the system is evaluated. Simulation results show that BER performance improves significantly with the modified MMSE equalizers and for all PU occupancy levels.
Sponsorship	IEEE Commun. Soc.
Starting Page	1056
Ending Page	1061
File Size	443347
Page Count	6
File Format	PDF
ISBN	9781479913534
DOI	10.1109/GLOCOM.2013.6831214
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-12-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Multicarrier code division multiple access Receivers Vectors Bandwidth Cognitive radio Equalizers Orthogonal Variable Spreading Factor Codes Cognitive Radio Orthogonal Frequency Division Multiplexing Multi-Carrier Code Division Multiple Access
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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