A novel spatial modulation technique with interference free simultaneous transmission

A performance-enhanced two-transmit antenna spatial modulation (SM) technique is introduced and analysed. Specifically, this paper modifies the conventional spatial modulation technique by utilising simultaneous transmission from two antennas, couple with the utilisation of short orthogonal codes for antenna identification. A unique symbol to antenna assignment to enable the receiver to distinguish between the different possible constellation points is also presented. To highlight the achieved gains, the paper compares the performances of the proposed technique to those of the conventional SM technique in OFDM systems. The results show that the proposed technique outperforms the conventional one in terms of BER performance. Furthermore we develop analytical analysis for the symbol error ratio (SER) of the proposed technique and show that the analytical and simulation results closely match.