Massive MIMO @ EIT
Today a mobile phone is much less “a phone” than it is a centre for our social networks, a diary, a personal assistant, a camera, and the way we keep updated on the latest news. There are no signs of slowdown in this development and a big challenge is the expected massive increases in wireless data traffic during the years to come. The radio spectrum is already crammed with mobile services, and mobile communication technologies are performing near their theoretical maxima. The spatial dimension, i.e. the location of mobile terminals in space, is still to be efficiently exploited. It is from this perspective we perform research in our project where we investigate mobile systems going massive.
[Popular science description.]
Contacts: Ove Edfors & Fredrik Tufvesson
Massive MIMO related research projects
REINDEER, BEYOND5, ELLIIT Very Large MIMO Arrays, ELLIT-LISA
MAMMOET, ELLIIT, DISTRANT, Efficient Precoding, Scaling MIMO, HiPEC, User terminals for Massive MIMO
E. G. Larsson, O. Edfors, F. Tufvesson, and T. L. Marzetta
Massive MIMO for Next Generation Wireless Systems
IEEE Communications Magazine, Vol. 52, No. 2, pp. 186-195, 2014.
F. Rusek, D. Persson, B. K. Lau, E. G. Larsson, T. L. Marzetta, O. Edfors, F. Tufvesson:
Scaling up MIMO: opportunities and challenges with very large arrays
IEEE Signal Processing Magazine, Vol. 30, No. 1, pp. 40-60, 2013.
From Communications Engineering: Ove Edfors, Fredrik Tufvesson, Ashkan Sheikhi, Guoda Tian, Xuhong Li, Sara Gunnarsson.
From Integrated Electronic Systems: Viktor Öwall, Liang Liu, Sidra Muneer, Mohammad Attari, Sijia Cheng, Steffen Malkowsky.
Alumni: Jesus Rodriguez-Sanches, MinKeun Chung, Harsh Tataria, Hemanth Prabhu, Joao Vieira, Erik Bengtsson, Zachary Miers, Xiang Gao, Ghassan Dahman
Special equipment and resources
In the general area of massive MIMO we have boith testbeds for real-time experiments, as well as channel sounding equipment for propagation measurements. Our sub-6GHz massive MIMO testbed is equipped with 100 centralized antennas. This testbed has aloso been upgraded to operation at 28 GHz, with up to 16 antennas of full digital beamforming. A distributed testbed for large intelligent surfaces below 6GHz is under development, where coherent sub-arrays can be distributed over a geografic area.
For more details of the sub-6GHz version of the LuMaMi testbed, see
S. Malkowsky et al., "The World’s First Real-Time Testbed for Massive MIMO: Design, Implementation, and Validation," in IEEE Access, vol. 5, pp. 9073-9088, 2017, doi: 10.1109/ACCESS.2017.2705561.
The 28 GHz upgrade of this testbed is described in
MinKeun Chung, et al., "LuMaMi28: Real-Time Millimeter-Wave Massive MIMO Systems with Antenna Selection", Manuscript on ArXiv.org