  Spatial complementary code keying modulation (SCCKM) is proposed as a novel
block coding modulation scheme. An input binary sequence is modulated based on
the different lengths of complementary code keying (CCK) modulation and then
spread across the transmit antennas (spatial domain) in a multiple input
multiple output (MIMO) system exploiting orthogonal frequency division
multiplexing (OFDM). At the receiver side, zero forcing equalization is applied
to the OFDM modulated data to mitigate the effect of the multipath fast fading
channel and then followed by maximum likelihood (ML) detection to retrieve the
input sequence. The performance of SCCKM in different MIMO systems is compared
to that of spatial modulation (SM) as a baseline scheme. Simulation results
show that for the same spectral efficiency, SCCKM is able to substantially
improve the bit error rate (BER).
