I. Introduction
Filter bank multicarrier with offset quadrature amplitude modulation (FBMC/OQAM) [1] –[10] is considered as a promising alternative to the conventional orthogonal frequency division multiplexing (OFDM) technique [11], [12]. However, integration of multiple-input multiple-output (MIMO) techniques with FBMC/OQAM, in general, is more complicated than with OFDM. Thanks to the adding of cyclic prefix (CP), a subchannel (subcarrier band) is exactly flat and independent from other subchannels in OFDM systems. Thus, MIMO precoding and equalization can be taken on each subchannel independently, without leading to any inter-carrier interference (ICI) or inter-symbol interference (ISI). However, without CP, the MIMO precoding and equalization of FBMC systems are more complicated and could lead to considerable ICI/ISI under frequency selective channels, due to the fact that FBMC/OQAM is a non-orthogonal waveform (FBMC/OQAM symbols are orthogonal with each other only in the real domain [1] –[3]).