Wireless Sensor Networks

621 WordsFeb 26, 20182 Pages
Wireless sensor networks typically consist of a large number of sensor nodes with limited onboard battery resources which are difficult to recharge or replace. Thus the reduction of energy consumption for end-to-end data rate and maximization of network lifetime have become chief research concern. In recent years, many techniques have been proposed for improving the energy efficiency in wireless sensor networks. Among these techniques, V-MIMO technique has been considered as one of the effective ways to save energy. In WSN a node has two communication related energy consuming roles, one role is to serve as a packet generating source node (SN), and the other role is to relay packets for the other nodes, which are both energy consuming operations. This is why the energy minimization is required to extend the lifetime of the WSN. WSN nodes are commonly designed to communicate using single-input-single-output (SISO) technology using a single transceiver antenna. Multiple-input-multiple-output (MIMO) with space-time block codes is a communication method that uses multiple antenna to enable lower power long-distance wireless communication over multipath fading channel. It may impossible to apply MIMO technology to small WSN devices since small sensor nodes may only be able to have a single antenna. Therefore, through collaboration of several single-antenna-equipped devices, a cooperative MIMO technique called virtual MIMO (V-MIMO) has been proposed in [4]. The single-hop energy
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