Energy-efficiency of MIMO and cooperative MIMO techniques in sensor networks
Energy efficient data transfer is one of the key factors for energy efficient wireless sensor network (WSN). In this paper, an energy efficient cooperative technique is proposed for a WSN where selected numbers of sensors at the transmitting end are used to form a MIMO structure wirelessly connected with selected number of sensors at the receiving end. The selection of nodes in the transmitting end is based on a selection function which is a combination of channel condition, residual energy, inter sensor distance in a cluster and geographical location whereas the selection in receiving side is performed on the basis of channel condition. Energy models are evaluated for correlated scenario. Experimental results show that the selected MIMO structure outperforms the unselected MIMO in terms of total energy consumption and hence in energy efficiency.