%0 Journal Article %@ 0090-6778 %A Amadori, PV %A Masouros, C %D 2015 %F discovery:1468649 %J IEEE TRANSACTIONS ON COMMUNICATIONS %K High dimensional MIMO, multiuser MIMO, beam selection, capacity maximization, SINR maximization, beamforming %N 6 %P 2212-2223 %T Low RF-Complexity Millimeter-Wave Beamspace-MIMO Systems by Beam Selection %U https://discovery-pp.ucl.ac.uk/id/eprint/1468649/ %V 63 %X Communications in millimeter-wave (mm-wave) spectrum (30-300 GHz) have experienced a continuous increase in relevance for short-range, high-capacity wireless links, because of the wider bandwidths they are able to provide. In this work, we introduce a new mm-wave frequency transmission scheme that exploits a combination of the concepts of beamspace multi-input multi-output (B-MIMO) communications and beam selection to provide near-optimal performances with a low hardware-complexity transceiver. While large-scale MIMO approaches in mm-wave are affected by high dimensional signal space that increases considerably both complexity and costs of the system, the proposed scheme is able to achieve near-optimal performances with a reduced radio-frequency (RF) complexity thanks to beam selection. We evaluate the advantages of the proposed scheme via capacity computations, comparisons of numbers of RF chains required and by studying the trade-off between spectral and power efficiency. Our analytical and simulation results show that the proposed scheme is capable of offering a significant reduction in RF complexity with a realistic low-cost approach, for a given performance. In particular, we show that the proposed beam selection algorithms achieve higher power efficiencies than a full system where all beams are utilized. %Z This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/