Energy efficiency is the most important design goal

for wireless sensor networks (WSNs). In this paper, we propose

an energy-efficient cooperative MIMO scheme, which

combines energy-efficient LEACH (EE-LEACH) protocol and

cooperative MIMO. We name it as EE-LEACH-MIMO

scheme. EE-LEACH is an improved LEACH algorithm, in

which the network is partitioned to sectors with equal angle for

avoiding the distribution non-uniformity of cluster heads. In

EE-LEACH-MIMO scheme, the location and the residual

energy of each node are considered when the cluster heads for

clustering and cooperative nodes for MIMO system are chosen.

For comparisons, LEACH, EE-LEACH, the simple

cooperative scheme with LEACH and MIMO (LEACHMIMO),

and EE-LEACH-MIMO scheme are simulated. The

result shows that EE-LEACH-MIMO scheme can well balance

the network load, save energy and prolong the network

lifetime