The Multicell Multiuser MIMO Uplink with Very Large Antenna Arrays and a Finite-Dimensional Channel
2013 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 61, no 6, 2350-2361 p.Article in journal (Refereed) Published
We consider multicell multiuser MIMO systems with a very large number of antennas at the base station (BS). We assume that the channel is estimated by using uplink training. We further consider a physical channel model where the angular domain is separated into a ﬁnite number of distinct directions. We analyze the so-called pilot contamination effect discovered in previous work, and show that this effect persists under the ﬁnite-dimensional channel model that we consider. In particular, we consider a uniform array at the BS. For this scenario, we show that when the number of BS antennas goes to inﬁnity, the system performance under a ﬁnite-dimensional channel model with P angular bins is the same as the performance under an uncorrelated channel model with P antennas. We further derive a lower bound on the achievable rate of uplink data transmission with a linear detector at theBS. We then specialize this lower bound to the cases of maximum-ratio combining (MRC) and zero-forcing (ZF) receivers, for a ﬁnite and an inﬁnite number of BS antennas. Numerical results corroborate our analysis and show a comparison between the performances of MRC and ZF in terms of sum-rate.
Place, publisher, year, edition, pages
2013. Vol. 61, no 6, 2350-2361 p.
Finite-dimensional channel, multicell mutiuser MIMO, pilot contamination, very large MIMO systems
Communication Systems Signal Processing
IdentifiersURN: urn:nbn:se:liu:diva-85223DOI: 10.1109/TCOMM.2013.032713.120408ISI: 000321219100023OAI: oai:DiVA.org:liu-85223DiVA: diva2:644849