  Index modulation (IM) techniques can be applied to the different media in
order to achieve spectral- and energy-efficient communication as well as to the
indices of the subcarriers of a generalized frequency division multiplexing
(GFDM) data block. In this work, a novel transceiver architecture for
multi-user GFDM-IM system is introduced. The performance of the GFDM-IM is
studied by considering the bit error rate (BER) as performance metric. It is
shown that better BER performance than the classical GFDM and the orthogonal
frequency division multiplexing (OFDM) with IM can be achieved by employing IM
to the GFDM.
