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Opportunistic spectrum sharing scheme for secondary WiFi-like devices in TV white spaces

Authors:
Bisera Jankuloska
Vladimir Atanasovski
Liljana Gavrilovska

Keywords: Opportunistic spectrum access, TV white spaces, Spectrum sharing, Interference protection zone, Flexible channel widths, Central frequencies adjusment

Abstract:
Secondary spectrum access is a promising approach to improve spectrum utilization by enabling new wireless systems to opportunistically use and efficiently share the licensed bands. This paper targets a WiFi-like reuse of available spectrum in the TV bands and proposes a novel cooperative centralized spectrum sharing scheme that enables protection for the primary users and provides efficient usage of the available spectrum for multiple coexisting secondary users. The proposed scheme relies on a Non-Linear Integer Programming (NLIP) optimization method to maximize the average SIR per secondary user. Furthermore, the sharing scheme introduces interference protection zones for primary users' protection from excessive interference. The simulation results show performance enhancements in terms of average throughput increase for the secondary users. Finally, the paper investigates the relations between secondary channels widths and the number of secondary users under strict interference constraints for primary users' protection. In this respect, the smaller step sizes for the channel widths lead to higher SIR increase regardless of the number of users.

Pages: 283 to 289

Copyright: Copyright (c) IARIA, 2011

Publication date: November 20, 2011

Published in: conference

ISSN: 2308-4278

ISBN: 978-1-61208-171-7

Location: Lisbon, Portugal

Dates: from November 20, 2011 to November 25, 2011