Cell-free massive MIMO: Uniformly great service for everyone
2015 (English)In: SPAWC 2015T. he 16th IEEE International Workshop on Signal Processing Advances in Wireless Communications, June 28 – July 1, 2015, Stockholm, Sweden, IEEE , 2015, 201-205 p.Conference paper (Refereed)
We consider the downlink of Cell-Free Massive MIMO systems, where a very large number of distributed access points (APs) simultaneously serve a much smaller number of users. Each AP uses local channel estimates obtained from received uplink pilots and applies conjugate beamforming to transmit data to the users. We derive a closed-form expression for the achievable rate. This expression enables us to design an optimal max-min power control scheme that gives equal quality of service to all users.
We further compare the performance of the Cell-Free MassiveMIMO system to that of a conventional small-cell network and show that the throughput of the Cell-Free system is much more concentrated around its median compared to that of the small cell system. The Cell-Free Massive MIMO system can provide an almost 20-fold increase in 95%-likely per-user throughput, compared with the small-cell system. Furthermore, Cell-Free systems are more robust to shadow fading correlation than small cell systems.
Place, publisher, year, edition, pages
IEEE , 2015. 201-205 p.
, IEEE International Workshop on Signal Processing Advances in Wireless Communications, ISSN 2325-3789
Massive MIMO, distributed massive MIMO, cell free massive MIMO, conjugate beamforming
Communication Systems Telecommunications
IdentifiersURN: urn:nbn:se:liu:diva-129071DOI: 10.1109/SPAWC.2015.7227028ISI: 000380547100041ISBN: 978-1-4799-1931-4OAI: oai:DiVA.org:liu-129071DiVA: diva2:935259
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), June 28 2015-July 1 2015, Stockholm, Sweden