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On the Capacity of Bidirectional Broadcast Channels under Channel Uncertainty
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-0036-9049
2009 (English)In: 2009 IEEE International Conference on Communications, 2009, 1583-1587 p.Conference paper (Refereed)
Abstract [en]

We consider the broadcast phase of a spectrally efficient two-phase decode-and-forward protocol which is used by a relay node to establish a bidirectional communication between two nodes. In the first phase the two nodes transmit their message to the relay node which decodes the messages. In the succeeding phase the relay node broadcasts a re-encoded composition of them. We consider imperfect channel knowledge and assume that all nodes merely know that the channel used for the transmission belongs to a set of channels. This is called compound bidirectional broadcast channel. We derive a universal strategy which achieves capacity and show that perfect channel state information (CSI) at the receivers does not lead to an increased capacity region. Otherwise, perfect CSI at the transmitter can advantageously be used to enlarge the capacity region. Finally, we give a game-theoretic interpretation as a game against nature.

Place, publisher, year, edition, pages
2009. 1583-1587 p.
, IEEE International Conference on Communications, ISSN 1550-3607
Keyword [en]
Bi-directional communication, Broadcast channels, Capacity regions, Channel uncertainties, Decode-and-forward protocols, Game against nature, Imperfect channel knowledge, Perfect channel state information, Relay node
National Category
URN: urn:nbn:se:kth:diva-52392DOI: 10.1109/ICC.2009.5199250ISI: 000280922200294ScopusID: 2-s2.0-70449516924ISBN: 978-1-4244-3434-3OAI: diva2:466434
IEEE International Conference on Communications (ICC 2009) JUN 14-18, 2009 Dresden, Germany

QC 20120109

Available from: 2011-12-15 Created: 2011-12-15 Last updated: 2014-10-08Bibliographically approved

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Oechtering, Tobias J.
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Communication TheoryACCESS Linnaeus Centre

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