  Filter-Bank Multi-Carrier with Offset Quadrature Amplitude Modulation
(FBMC/OQAM) is considered by recent research projects as one of the key
enablers for the future 5G air interface. It exhibits better spectral shape and
improves mobility support compared to Orthogonal Frequency-Division
Multiplexing (OFDM) thanks to the use of a time and frequency localized
prototype filter. The choice of this filter is crucial for FBMC/OQAM, due to
its substantial impact on achieved performance and complexity levels. In the
context of 5G, short frame sizes are foreseen in several communication
scenarios to reduce system latency, and therefore short filters are preferred.
In this context, a novel short filter allowing for near perfect reconstruction
and having the same size as one OFDM symbol is proposed. Using Frequency-Spread
(FS) implementation for the FBMC/OQAM receiver, analytical analysis and
simulation results show that the proposed filter exhibits better robustness to
several types of channel impairments when compared to State-of-The-Art (SoTA)
prototype filters and OFDM modulation. In addition, FS-based hardware
architecture of the filtering stage is proposed, showing lower complexity than
the classical PolyPhase Network (PPN)-based implementation.
