  Multidimensional generalized quadrature index modulation scheme is proposed
in this paper for conveying extra digital information with the aid of the
space, radio frequency (RF) mirrors, and time indices. Explicitly, this
proposed scheme cleverly combines another proposed time-indexed generalized
quadrature spatial modulation (TI-GQSM) system with media-based modulation
(MBM) transmission principle using RF mirrors, and it is referred to as
TI-GQSM-MBM scheme. This scheme is attractive because of both the high data
rate and the significant performance improvements that can be achieved. The
system performance of the proposed schemes in terms of the bit error rate (BER)
is evaluated and compared to the performance of the conventional schemes.
Simulation results showed that a significant improvement is achieved by the
TI-GQSM-MBM scheme as compared to that of TI-GQSM, time-indexed media-based
modulation (TI-MBM) and the conventional generalized quadrature spatial
modulation (GQSM) schemes for the same rate. It is also demonstrated that the
proposed schemes are robust to channel estimation errors (CEEs) as compared to
multidimensional generalized spatial modulation (GSM) schemes. Therefore, the
proposed schemes can be effectively used as an alternative solution for various
5G and beyond wireless networks.
