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L. Nagel, S. Pratschner, S. Schwarz, M. Rupp:
"Efficient Multi-User MIMO Transmissions in the LTE-A Uplink";
Talk: International Workshop on Link- and System Level Simulations, Wien; 07-01-2016; in: "International Workshop on Link- and System Level Simulations (IWSLS)", IEEE Xplore, ISBN 978-1-5090-4949-3 (2016), ISBN: 978-1-5090-4949-3.

Single-User Multiple-Input Multiple-Output
(MIMO) transmissions are possible since Rel. 10 of 3GPP
LTE-A. The Closed Loop Spatial Multiplexing (CLSM)
transmission mode enables up to a four fold increase in spectral
efficiency compared to Rel. 8, yet it requires complex User
Equipment (UE) hardware supporting more than one transmit
antenna. The closed loop spatial multiplexing transmission mode
enables up to a four fold increase in spectral efficiency compared
to Rel. 8, yet it requires complex UE hardware supporting more
than one transmit antenna. As it is likely that the Base Station
(BS) has more receive antennas than the UE transmit antennas,
employing Multi-User (MU) MIMO transmissions in the uplink
can lead to significant improvement in cell throughput. We
formulate MU MIMO transmissions with linear receivers as a
compact matrix system model. Based on our model we present
a post-equalization SINR equation, allowing the calculation of
a quantized feedback parameter, the Channel Quality Indicator
(CQI) value. Within this framework we reveal possible MU gains
through known scheduling algorithms although the frequency
selective channel is approximated by its arithmetic mean.

LTE-A, uplink, MU MIMO, MIMO MAC, scheduling

http://dx.doi.org/10.1109/IWSLS.2016.7801581

http://publik.tuwien.ac.at/files/publik_253479.pdf