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M. Lerch, M. Rupp:
"Measurement-Based Evaluation of the LTE MIMO Downlink at Different Antenna Configurations";
Poster: 17th International ITG Workshop on Smart Antennas (WSA 2013), Stuttgart, Germany; 03-13-2013 - 03-14-2013; in: "Proc. of 17th International ITG Workshop on Smart Antennas (WSA 2013)", (2013), ISBN: 978-3-8007-3466-5.

Multi-antenna transmission modes are an integral
feature of the 3GPP LTE downlink. While these modes are well
defined in the standard there are no restrictions on the choice of
transmit and receive antennas. In order to investigate the impact
of the basestation antenna configuration on the LTE open loop
downlink, a measurement campaign, comparing horizontally and
vertically spaced antenna configurations for the two and four
antenna case was performed whereas a considerable difference in
performance depending on the antenna configuration is observed.
Besides the evaluation in terms of LTE physical layer throughput
the channel capacity and other measures have been calculated as
upper bounds for the performance of a communication system. A
comparison of the results for one, two and four transmit antennas
shows that less than 50% of the channel capacity are reached
and the higher the number of transmit antennas, the larger the
gap between channel capacity and achievable throughput.

http://publik.tuwien.ac.at/files/PubDat_217376.pdf