High rate transmit diversity assisted space shift keying modulation over MIMO channels

Space shift keying (SSK) modulation is a newly emerging transmission technology for multiple-input multiple-output (MIMO) wireless systems. In this paper, we propose a novel high rate transmit diversity assisted space shift keying (HT-SSK) modulation scheme to achieve the transmit diversity gain over SSK system with high spectrum efficiency. We first apply antenna shift method at each time slot to achieve transmit diversity with L time slots. Then, we use the different transmit signal combinations of L time slots to convey the additional n≤ d log₂^cLinformation bits, where c is the number of transmit symbols in total. Thus, the proposed HT-SSK modulation scheme achieves higher spectrum efficiency than conventional transmit diversity assisted space shift keying modulation scheme, while achieves the same transmit diversity gain with small performance loss. Simulation results show that the proposed HT-SSK scheme provides significant performance gain than SSK modulation scheme with the same spectrum efficiency. It also outperforms the conventional spatial modulation (SM) scheme.