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On the achievable degrees of freedom of partially cooperative X networks with delayed CSIT
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-7926-5081
2012 (English)In: 2012 IEEE Global Communications Conference (GLOBECOM), New York: IEEE , 2012, 2450-2454 p.Conference paper, Published paper (Refereed)
Abstract [en]

We investigate the achievable degrees of freedom (DoF) in K-user X networks (K × K X networks) with delayed channel state information at transmitters (CSIT), where partial cooperation (i.e. message sharing) is potentially allowed among transmitters. We consider two possible cooperation scenarios. In the first scenario one of the transmitters serves as a super node which can obtain the messages of the other transmitters. By proper interference alignment (IA) design, we prove that a DoF 2K over K+1 can be achieved almost surely. In the second scenario, there is no super node but each transmitter shares its message to its left-side neighbor. We show that when K = 3, DoF 7 over 5 is achievable. In both cases, the achieved DoF are shown to be improved compared with non-cooperative X networks. Moreover, we use a simple example to show that sharing a subset of messages may also improve DoF.

Place, publisher, year, edition, pages
New York: IEEE , 2012. 2450-2454 p.
Series
IEEE Global Telecommunications Conference (Globecom), ISSN 1930-529X
Keyword [en]
Delayed CSIT, Interference alignment, Non-cooperative, Partial cooperation, Supernodes
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-105503DOI: 10.1109/GLOCOM.2012.6503484ISI: 000322375102134Scopus ID: 2-s2.0-84877682511ISBN: 978-146730921-9 (print)OAI: oai:DiVA.org:kth-105503DiVA: diva2:571189
Conference
2012 IEEE Global Communications Conference, GLOBECOM 2012; Anaheim, CA; United States; 3 December 2012 through 7 December 2012
Funder
ICT - The Next Generation
Note

QC 20121207

Available from: 2012-12-07 Created: 2012-11-21 Last updated: 2013-11-28Bibliographically approved

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Xiao, MingSkoglund, Mikael

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