  A novel architecture for MIMO transmission and reception of filterbank
multicarrier (FBMC) modulated signals under strong frequency selectivity is
presented. The proposed system seeks to approximate an ideal
frequency-selective precoder and linear receiver by Taylor expansion,
exploiting the structure of the analysis and synthesis filterbanks. The
resulting architecture is implemented by linearly combining conventional MIMO
linear transceivers, which are applied to sequential derivatives of the
original filterbank. The classical per-subcarrier precoding/linear receiver
configuration is obtained as a special case of this architecture, when only one
stage is fixed at both transmitter and receiver. An asymptotic expression for
the resulting intersymbol/intercarrier (ISI/ICI) distortion is derived assuming
that the number of subcarriers grows large. This expression can in practice be
used in order to determine the number of parallel stages that need to be
implemented in the proposed architecture. Performance evaluation studies
confirm the substantial advantage of the proposed scheme in practical
frequency-selective MIMO scenarios.
