Energy Efficient Cooperative MIMO in Wireless Sensor Network

An energy efficient cooperative MIMO technique is proposed in the wireless sensor networks where fixed constellation size is considered in transmitting both the local and long haul communication. A selection criteria is used here based on the channel conditions where a selected numbers of sensors in a cluster are used to form a multiple input multiple output (MIMO) structure wirelessly connected with multiple antennas of a data gathering node (DGN). The selected approach is tested on the correlated data scenario. Experimental results show that the selected cooperative MIMO (C-MIMO) structure outperforms the unselected C-MIMO in terms of total energy consumption and they show energy efficient performance over existing one when they are compared with SISO structure. Energy models are evaluated for this scenario while energy consumption and efficiency are compared for different combination of cluster size and selected number of sensors. Comparisons are shown for different fixed number of constellation sizes. The effect of correlation coefficient and inter sensor distance are analyzed.