Abstract:

Aiming at parallel estimation structure for wireless sensor network, the distributed estimation problems in wireless sensor network were discussed and an energy efficient distributed estimation algorithm was presented in this paper as well as the corresponding power allocation problems are described. The system used the pattern of multiple transmission and single receiver for the same observation target. Convergence center gived the estimation of observation objects according to the messages sent by all sensor nodes in the observation areas. The algorithm was based on LMMSE standards. Considering two factors of total energy restriction and the state information of each branch channel and to satisfy the performance requirements of the premise, part of the node was chosed as the active node to transmit data and participate in the corresponding power distribution. Then the not selected node power supply was closed to save energy effectively and prolong the lifetime of wireless sensor network. The experimental results show that the system performance of the distributed estimation algorithm for power allocation and the estimated value of the mean square error performance are superior to the algorithm for the equal power allocation.

Key words: wireless sensor networks; energy efficiency; distributed estimation; power allocation; equal power allocation