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On the Achievable Degrees of Freedom in a Class of Multi-user Half-duplex Relay Networks
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (Communication Theory)
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. (Communication Theory)ORCID iD: 0000-0002-7926-5081
2013 (English)In: 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE , 2013, 2677-2682 p.Conference paper, Published paper (Refereed)
Abstract [en]

We study the achievable sum degrees of freedom(DoF) in a class of wireless single-antenna multi-hop half-duplexrelay networks. The networks contain Ms information sources, Md information destinations, and arbitrary layers of relays, each with 2K (K ≥ max{Ms,Md}) half-duplex relays, in between. A cluster successive relaying transmission scheme is applied to conduct the communication: We divide the relays in each layer into two equal-size clusters and activate them successively to efficiently use the available channel. It is shown that in a time-varying fading environment this scheme asymptotically achieves the sum DoF min{MsK/(Ms+K) , MdK/(Md+K−1)}, which is irrelevant to the number of hops the source messages have to pass through. This result also implies that, when the number of relays in each layeris infinitely large, the available DoF (i.e. the optimally achievable sum DoF) of the considered networks is min{Ms,Md}. Neither distributed signal processing nor multiple layers of half-duplex relay operation negatively affects the system DoF performance.

Place, publisher, year, edition, pages
IEEE , 2013. 2677-2682 p.
Series
IEEE Wireless Communications and Networking Conference Proceedings, ISSN 1525-3511
Keyword [en]
Interference Alignment, Capacity, Channel, Region
National Category
Engineering and Technology
Research subject
SRA - ICT
Identifiers
URN: urn:nbn:se:kth:diva-117703DOI: 10.1109/WCNC.2013.6554984ISI: 000326048102131Scopus ID: 2-s2.0-84881573306ISBN: 978-1-4673-5938-2 (print)ISBN: 978-1-4673-5937-5 (print)OAI: oai:DiVA.org:kth-117703DiVA: diva2:602650
Conference
2013 IEEE Wireless Communications and Networking Conference, WCNC 2013; Shanghai; China; 7 April 2013 through 10 April 2013
Note

QC 20130903

Available from: 2013-02-02 Created: 2013-02-02 Last updated: 2013-12-10Bibliographically approved

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Skoglund, Mikael

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