Abstract:

In order to guarantee a better operation performance for sensors while controlling the system  energyconsumption, both multi-hop transmission mode and censoring transmission strategy are introduced into the decision fusion of the resource constrained wireless sensor networks. The optimal fusion rule is derived under  the assumption of Rayleigh channel model. However, the optimal fusion rule requires the real-time channel information which is too costly for resourceconstrained sensor networks, so a suboptimal likelihood ratio test  fusion rule based on the knowledge of channel statistics is proposed. In addition, the simplified form of the suboptimal fusion rule is also given under low channel signal to noise ratio (SNR). Theoretical analysis and simulations show that the suboptimal fusion rules need much less computation and information, yet exhibits only slight performance degradation. The introduction of censoring strategy also reduces the energy consumption of system transmission.