  In this letter, a low-complexity iterative detector with frequency domain
equalization is proposed for generalized spatial modulation (GSM) aided single
carrier (SC) transmissions operating in frequency selective channels. The
detector comprises three main separate tasks namely, multiple-input
multiple-output (MIMO) equalization, active antenna detection and symbol wise
demodulation. This approach makes the detector suitable for a broad range of
MIMO configurations, which includes single-user and multiuser scenarios, as
well as arbitrary signal constellations. Simulation results show that the
receiver can cope with the intersymbol interference induced by severe time
dispersive channels and operate in difficult underdetermined scenarios where
the total number of transmitter antennas is substantially larger than the
number of receiver antennas.
