Date Added: Dec 2011
In this paper, the authors present an energy efficient hierarchical cooperative clustering scheme for wireless sensor networks. Communication cost is a crucial factor in depleting the energy of sensor nodes. In the proposed scheme, nodes cooperate to form clusters at each level of network hierarchy ensuring maximal coverage and minimal energy expenditure with relatively uniform distribution of load within the network. Performance is enhanced by cooperative Multiple-Input Multiple-Output (MIMO) communication ensuring energy efficiency for WSN deployments over large geographical areas. They test their scheme using TOSSIM and compare the proposed scheme with Cooperative Multiple-Input Multiple-Output (CMIMO) clustering scheme and traditional multi-hop Single-Input-Single-Output (SISO) routing approach.