Multi-Pair Amplify-and-Forward Relaying with Very Large Antenna Arrays
2013 (English)In: Proceedings of the IEEE International Conference on Communicatons (ICC), IEEE , 2013, 4635-4640 p.Conference paper (Refereed)
We consider a multi-pair relay channel where multiple sources simultaneously communicate with destinations using a relay. Each source or destination has only a single antenna, while the relay is equipped with a very large antenna array. We investigate the power efﬁciency of this system when maximum ratio combining/maximal ratio transmission (MRC/MRT) or zero-forcing (ZF) processing is used at the relay. Using a very large array, the transmit power of each source or relay (or both) can be made inversely proportional to the number of relay antennas while maintaining a given quality-of-service. At the same time, the achievable sum rate can be increased by a factor of the number of source-destination pairs. We show that when the number of antennas grows to inﬁnity, the asymptotic achievable rates of MRC/MRT and ZF are the same if we scale the power at the sources. Depending on the large scale fading effect, MRC/MRT can outperform ZF or vice versa if we scale the power at the relay.
Place, publisher, year, edition, pages
IEEE , 2013. 4635-4640 p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-89660DOI: 10.1109/ICC.2013.6655302ISI: 000349673804117ISBN: 978-146733122-7OAI: oai:DiVA.org:liu-89660DiVA: diva2:608711
2013 IEEE International Conference on Communications, ICC 2013; Budapest; Hungary