Optimal transmit strategy for the 2 x 1 MISO bidirectional broadcast channel
2008 (English)In: 2008 IEEE 9TH WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, VOLS 1 AND 2, 2008, 316-320 p.Conference paper (Refereed)
We consider the broadcast phase of a three-node network, where a relay node with multiple antennas establishes a bidirectional communication between the two other nodes each equipped with a single antenna using a spectrally efficient two phase protocol. In the first phase, both nodes transmit a message to the relay node, which decodes the messages. In the second phase the relay broadcasts a re-encoded composition of them. In this work, we show that for two transmit antennas at the relay node transmitting a single beam is always an optimal transmit strategy. We show that if a single beam is optimal the beamforming vector is a linear combination of the two single-user optimal strategies. Further, we analyze the dependency of the capacity region on the correlation between the two channels.
Place, publisher, year, edition, pages
2008. 316-320 p.
Signal Processing Telecommunications
IdentifiersURN: urn:nbn:se:kth:diva-52400DOI: 10.1109/SPAWC.2008.4641621ISI: 000263224100064OAI: oai:DiVA.org:kth-52400DiVA: diva2:466425
9th IEEE Workshop on Signal Processing Advances in Wireless Communications. Recife, BRAZIL. JUL 06-09, 2008
QC 201112162011-12-152011-12-152011-12-16Bibliographically approved