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S. Schwarz, M. Rupp:
"Evaluation of Distributed Multi-User MIMO-OFDM with Limited Feedback";
IEEE Transactions on Wireless Communications, 13 (2014), 11; 6081 - 6094.

In this article, we investigate the performance of cellular
networks employing remote radio units to enable distributed
multi-user MIMO transmission using block-diagonalization precoding.
We consider the downlink of an OFDM based LTE compliant
multi-carrier system in which the users provide channel
state information (CSI) to the base station via limited capacity
feedback links. With limited feedback, residual interference between
the spatially multiplexed users cannot be avoided, causing
an interference-limitation of the achievable downlink throughput.
Efficient CSI quantization is therefore central in such systems to
achieve a performance gain over single-user MIMO. Building on
Grassmannian CSI quantization concepts, we propose an effective
CSI feedback clustering approach in this work to exploit the
correlation of the wireless channel in the frequency domain. We
furthermore derive the corresponding channel quality feedback
and propose a practical greedy multi-user scheduler.

limited feedback, multi-user MIMO, blockdiagonalization, OFDM, distributed antenna systems

http://dx.doi.org/10.1109/TWC.2014.2346191

Project Head Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"

Project Head Markus Rupp:
Mobile Access Research 2015