On the Optimal Transmission for the MIMO Bidirectional Broadcast Channel
2009 (English)In: 2009 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-8, 2009, 1742-1746 p.Conference paper (Refereed)
In this work the transmit covariance matrix optimization problem for the MIMO Gaussian bidirectional broadcast channel is studied. A half-duplex relay node establishes bidirectional communication between two nodes using a decode-and-forward protocol. In the initial multiple access phase both nodes transmit their messages to the relay node. In the succeeding phase the relay broadcasts an optimal re-encoded message so that both nodes can decode the other's message using their own message as side information. We show that if the channels are orthogonal then there exist equivalent transmit strategies with different ranks. The study of special cases reveals some of the difficult structure of the optimal solution. In particular a closed form procedure for the case of full rank transmission for invertible channels is derived. Moreover, for parallel channels the optimal solution is completely characterized and discussed.
Place, publisher, year, edition, pages
2009. 1742-1746 p.
, IEEE International Conference on Communications, ISSN 1550-3607
Bi-directional communication, Broadcast channels, Closed form, Decode-and-forward protocols, Gaussians, Half-duplex relay, Multiple access, Optimal solutions, Optimal transmission, Parallel channel, Relay node, Side information, Broadcasting, Covariance matrix, Multiplexing, Optimal systems
IdentifiersURN: urn:nbn:se:kth:diva-29243DOI: 10.1109/ICC.2009.5199259ISI: 000280922200324ScopusID: 2-s2.0-70449512884ISBN: 978-1-4244-3434-3OAI: oai:DiVA.org:kth-29243DiVA: diva2:392693
IEEE International Conference on Communications (ICC 2009), Dresden, GERMANY, JUN 14-18, 2009
QC 201101272011-01-272011-01-272011-01-27Bibliographically approved