Distributed power allocation for cooperative access in cognitive radios to guarantee QoS for cell edge primary users
2013 (English)In: Proceedings of 2013 6th Joint IFIP Wireless and Mobile Networking Conference, WMNC 2013, New York: IEEE , 2013, 6549027- p.Conference paper (Refereed)
Cognitive radio (CR) systems have been proposed for efficient usage of spare spectrum licensed to primary systems. This leads to the issue of providing as much spectrum to CR users as possible while not degrading the quality of service (QoS) of primary users of the spectrum. This paper proposes a novel cooperation scheme between primary and CR users to guarantee QoS of primary users up to the cell edge while making the licensed spectrum available for opportunistic access by the CR users. We suggest that the primary users at the cell edge, who have poor QoS, should allow secondary users to access their spectrum, while at the same time, the secondary users would help to enhance the primary users QoS using superposition coding on the primary users transmissions. Thus the proposed method can provide a so called 'win-win strategy' by benefiting both primary and CR users. The proposed cooperative access scheme in cognitive radios solves efficiently the sum-rate maximization problem on cognitive Gaussian Multiple Access Channels (GMACs) for power allocation of primary systems that cooperates with CR systems in a distributed fashion. We solved the problem using iterative Jacobian method in a distributed manner. Numerical results show that the QoS of primary users at the cell edge is improved by the proposed cooperative access scheme.
Place, publisher, year, edition, pages
New York: IEEE , 2013. 6549027- p.
Distributed Power-Allocation, Gaussian multiple-access channels, Numerical results, Opportunistic access, Power allocations, Sum-rate maximizations, Super-position coding, Win-win strategies
IdentifiersURN: urn:nbn:se:kth:diva-133865DOI: 10.1109/WMNC.2013.6549027ISI: 000325088400075ScopusID: 2-s2.0-84881411880ISBN: 978-146735616-9OAI: oai:DiVA.org:kth-133865DiVA: diva2:663558
2013 6th Joint IFIP Wireless and Mobile Networking Conference, WMNC 2013; Dubai; United Arab Emirates; 23 April 2013 through 25 April 2013
QC 201311122013-11-122013-11-112014-01-16Bibliographically approved