Energy efficiency of transmit diversity system in correlated channel

MIMO energy efficiency has attracted a lot of attention recently. In this paper, energy efficiency of two different transmit diversity schemes (transmit antenna selection and transmit beamforming) is analyzed in correlated channel. We derive the relationship between spatial correlation and energy efficiency of two transmit diversity schemes and find that spatial correlation has different effects on them. In order to improve the energy efficiency of the system, we calculate the boundary spatial correlation coefficient based on which transmit diversity schemes can be adopted adaptively. Finally, a simulation is developed to prove our analysis.