Chapter 13 - MIMO-FBMC Transceivers
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AbstractThe chapter shows that the FBMC/OQAM extension to MIMO architectures is not trivial since different multiantenna links are subject to independent fading conditions. As a consequence, the superposition of signals at the receiver does not preserve the characteristics of the modulation so that the intrinsic interference is not in quadrature with the desired data. Hence, the perfect reconstruction property cannot be exploited unless the channel is compensated. To get rid of the interference, it is desirable to have an equivalent response, which encompasses the precoder, the channel and the equalizer, with a diagonal structure. If the channel frequency response is sufficiently smooth in the pass band region of one subcarrier, OFDM-based solutions can be successfully applied. However, when the channel frequency selectivity is severe, new MIMO techniques have to be devised. With the aim of providing a concise overview and a valuable insight into the signal processing developments that allow the combination of FBMC/OQAM with MIMO, this chapter describes and assesses the state-of-the-art MIMO precoding and decoding designs for FBMC/OQAM systems in mild- and strong-frequency selectivity scenarios.

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