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This paper studies the MIMO applicability to FBMC for low coherence bandwidth channels. Under these conditions the channel frequency response cannot be modeled flat at a subcarrier level. This implies that the techniques originally devised for OFDM do not restore the orthogonality between subcarriers when they are directly applied to FBMC. Aiming at circumventing this problem the authors propose the design of two MIMO FBMC schemes, which are based on a new sub-band processing. The figures of merit that govern the design of the first and second scheme are the SLNR and the SINR, respectively. However, they do not restrict the analysis to the design of a new sub-band processing but they also carry out an asymptotic analysis of the complexity as well as tackle the problem of estimating the channel.
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