Experimental performance bounds of MIMO-FBMC/OQAM systems

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Caus, Marius; Perez-Neira, Ana I. (Dept. of Signal Theory and Communications - Universitat Politecnica de Catalunya (UPC), Campus Nord, Jordi Girona 1-3, 08034 Barcelona, Spain)
Perez-Neira, Ana I. (Centre Tecnologic de Telecomunicacions de Catalunya (CTTC), Av. Carl Friedrich Gauss 7, B4 08860 Castelldefels, Barcelona, Spain)

This paper addresses the application of filter bank multicarrier (FBMC) systems to multiple-input-multiple-output (MIMO) channels. In particular, it is investigated the FBMC modulation based on OQAM, known as FBMC/OQAM. Existing solutions reveal that FBMC/OQAM remains competitive with the orthogonal frequency division multiplexing (OFDM) technique when the number of streams (S), transmit antennas (NT ) and receive antennas (NR) are related as follows: S = min(NT ,NR). State-of-the-art techniques fail to achieve satisfactory results in FBMC/OQAM systems when S < min(NT ,NR). That is because the strongest spatial subchannels exhibit higher gains in MIMO-OFDM than in existing MIMO-FBMC/OQAM systems. To determine if FBMC/OQAM can be successfully applied when strict inequality holds, this paper provides experimental performance bounds, which can be assumed to approximate the optimal performance. In this sense, numerical results show that FBMC/OQAM is able to slightly outperform OFDM when S < min(NT ,NR) by attenuating the residual interference 20 dB below the equalized noise. This insightful information could be used in the design process of future techniques to approach the experimental performance bounds.