ADAPTIVE HYBRID SPATIAL MODULATION SCHEME FOR MIMO SYSTEMS

Spatial modulation (SM) is an emerging communication technology applied in MIMO systems, which can further exploit the potential of MIMO systems. A novel hybrid spatial modulation (HSM) policy is developed in this paper to better match switches between different SM schemes for each channel realization according to the value of the minimum Euclidean distance. In addition, by employing antenna selection mechanisms (specifically, EDAS and COAS) in HSM, improved versions named HSM-EDAS, and HSM-COAS are proposed. In order to reduce the high computation complexity occurred in HSM-EDAS, two low-complexity algorithms are further presented. Simulation results verify the theoretical analysis that the presented HSM, HSM-EDAS and HSM-COAS schemes all decrease the pairwise error probability (PEP) and HSM-EDAS outperforms HSM-COAS whereas the latter achieves better tradeoff between performance and capacity with much lower computation complexity.