Multi-pair amplify-and-forward relaying with very large antenna arrays
2013 (English)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
Budapest: IEEE , 2013.
Achievable sum rates, Amplify-and-forward relaying, Maximum ratio combining, Multiple source, Power efficiency, Source-destination pairs, Transmit power, Very large arrays
IdentifiersURN: urn:nbn:se:bth-6738DOI: 10.1109/ICC.2013.6655302Local ID: oai:bth.se:forskinfoF133B7FB8C96FF6FC1257CBA00271A2CISBN: 978-146733122-7OAI: oai:DiVA.org:bth-6738DiVA: diva2:834271
IEEE International Conference on Communications (ICC)