TY - JOUR
T1 - Non-Stationarities in Extra-Large-Scale Massive MIMO
AU - De Carvalho, Elisabeth
AU - Ali, Anum
AU - Amiri, Abolfazl
AU - Angjelichinoski, Marko
AU - W. Heath Jr., Robert
PY - 2020/8
Y1 - 2020/8
N2 - Massive MIMO, a key technology for increasing area spectral efficiency in cellular systems, was developed assuming moderately sized apertures. In this article, we argue that massive MIMO systems behave differently in large-scale regimes due to spatial non-stationarity. In the large-scale regime, with arrays of around 50 wavelengths, the terminals see the whole array but non-stationarities occur because different regions of the array see different propagation paths. At even larger dimensions, which we call the extra-large scale regime, terminals see a portion of the array and inside the first type of non-stationarities might occur. We show that the non-stationarity properties of the massive MIMO channel change several important MIMO design aspects. In simulations, we demonstrate how non-stationarity is a curse when neglected but a blessing when embraced in terms of computational load and multi-user transceiver design.
AB - Massive MIMO, a key technology for increasing area spectral efficiency in cellular systems, was developed assuming moderately sized apertures. In this article, we argue that massive MIMO systems behave differently in large-scale regimes due to spatial non-stationarity. In the large-scale regime, with arrays of around 50 wavelengths, the terminals see the whole array but non-stationarities occur because different regions of the array see different propagation paths. At even larger dimensions, which we call the extra-large scale regime, terminals see a portion of the array and inside the first type of non-stationarities might occur. We show that the non-stationarity properties of the massive MIMO channel change several important MIMO design aspects. In simulations, we demonstrate how non-stationarity is a curse when neglected but a blessing when embraced in terms of computational load and multi-user transceiver design.
U2 - 10.1109/MWC.001.1900157
DO - 10.1109/MWC.001.1900157
M3 - Journal article
SN - 1536-1284
VL - 27
SP - 74
EP - 80
JO - IEEE Wireless Communications
JF - IEEE Wireless Communications
IS - 4
M1 - 19890691
ER -