Large-Scale Multipair Two-Way Relay Networks with Distributed AF Beamforming
2013 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 17, no 12, 1-4 p.Article in journal (Refereed) Published
We consider a multipair two-way relay network where multiplecommunication pairs simultaneously exchange information with the helpof multiple relay nodes. All nodes are equipped with a single antennaand channel state information is available only at the relay nodes. Each relay uses very simplesignal processing in a distributed manner, called distributed amplify-and-forward (AF) relaying. A closed-form expression for the achievable rate is derived. We show that the distributed AF scheme outperforms conventional orthogonal relaying. When the number of relay nodes is large, the distributed AF relaying scheme can achieve the capacity scaling given by the cut-set upper bound. Furthermore, when the number of relay nodes grows large, the transmit powers of each terminal and of the relay can be made inversely proportional to the number of relay nodes while maintaining a given quality-of-service. If the transmit power of each terminal is kept fixed, the transmit power of each relay node can be scaled down inversely proportional to the square of the number of relays.
Place, publisher, year, edition, pages
IEEE Press, 2013. Vol. 17, no 12, 1-4 p.
Communication Systems Signal Processing Telecommunications
IdentifiersURN: urn:nbn:se:liu:diva-98122DOI: 10.1109/LCOMM.2013.102213.131813ISI: 000329528200021OAI: oai:DiVA.org:liu-98122DiVA: diva2:652204