On the Operation of Massive MIMO with and without transmitter CSI
2014 (English)In: Signal Processing Advances in Wireless Communications (SPAWC), 2014 IEEE 15th International Workshop on, IEEE , 2014, 1-5 p.Conference paper (Refereed)
The paper considers the issue of activating inactive terminals by control signaling in the downlink in a massive MIMO system. There are two basic difficulties with this. First, the lack of CSI at the transmitter. Second, the short coherence interval, which limits the number of orthogonal pilots in the case of many antennas. The proposed scheme deals with these issues by repeating the transmission over the antennas. We show that this repetition does not affect the spectral efficiency significantly, while making it possible to estimate the channel in a standard way using MMSE. The paper also sheds some light the uplink-downlink power balance in massive MIMO.
Place, publisher, year, edition, pages
IEEE , 2014. 1-5 p.
, IEEE International Workshop on Signal Processing Advances in Wireless Communications, ISSN 2325-3789
massive MIMO, no CSI, large scale antenna system, spatial repetition, dimension reduction
IdentifiersURN: urn:nbn:se:liu:diva-113564DOI: 10.1109/SPAWC.2014.6941305ISI: 000348859000001ISBN: 978-1-4799-4903-8OAI: oai:DiVA.org:liu-113564DiVA: diva2:783010
IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2014 , 22-25 June, Toronto, Canada