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Transmit Beamforming Analysis for MIMO Systems in Indoor Residential Environment Based on 3D Ray Tracing

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Abstract

In this paper, an evaluation of transmit beamforming (TxBF) contribution is analyzed in the context of an indoor residential environment. Using an optimized 3D ray tracing tool, the multiple-input multiple-output (MIMO) propagation channel is simulated. The algorithm of singular value decomposition is applied and a new transmission scheme is considered. Comparisons of cases with/without TxBF are realized by analyzing the received power, the signal to noise ratio of each spatial stream and the channel capacity. It is shown that the TxBF capacity gain increases when the MIMO channel correlation at the transmit side reaches high values, especially when only the dominant eigen mode is selected. The main result concerns the antenna spacing: a judicious choice of the transmitting antenna spacing can improve the effective transmission range by more than 45 % in non-line of sight conditions. Several MIMO configurations (number of antennas and spatial streams) are also compared to determine the relevance of a possible activation of TxBF. The interference influence is studied and it is shown that under some conditions, TxBF improves the signal to interference ratio.

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Authors and Affiliations

  1. Orange Labs, Wireless Engineering and Propagation, 1 Rue Louis et Maurice de Broglie, Bâtiment 11, 90000, Belfort, France

    Ali Bouhlel & Valéry Guillet

  2. Institute of Electronics and Telecommunications of Rennes, IETR, UMR CNRS 6164, 20 Avenue des Buttes de Coësmes, CS 70839, 35708, Rennes Cedex 7, France

    Ghaïs El Zein & Gheorghe Zaharia

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  1. Ali Bouhlel
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  2. Valéry Guillet
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  3. Ghaïs El Zein
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  4. Gheorghe Zaharia
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Correspondence to Ghaïs El Zein.

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Bouhlel, A., Guillet, V., El Zein, G. et al. Transmit Beamforming Analysis for MIMO Systems in Indoor Residential Environment Based on 3D Ray Tracing. Wireless Pers Commun 82, 509–531 (2015). https://doi.org/10.1007/s11277-014-2238-5

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