Space modulation techniques
Space modulation techniques (SMTs) have recently been emerged as one of the spatial multiplexing MIMO technologies that enhance the spectral efficiency of the conventional MIMO by embedding additional information via the transmit entities of the building blocks of the communication systems 3. In particular, the SMTs alter the on/off status of the transmit antennas in the transmit antenna array to convey an additional information. Therefore, single or multiple transmit antennas is/are selected to transmit the habitual data constellation symbols and the index/indices of this/these transmit antennas is/are considered another source of information. Altering the on/off status of the transmit antennas in the transmit antenna arrays, enables the use of limited number of radio frequency (RF) chains at the transmitter (TX) side, relaxes the sought-after inter-antenna synchronization (IAS) and permits the use of low complexity decoding algorithms at the receiver (RX) side 4.