Abstract
Network lifetime is a typical topic in wireless sensor network since the power supply of wireless sensors is energy limited and non-rechargeable. In this thesis, we consider a distributed estimation system, if we want to maintain the estimation quality and extend network lifetime, the research literature [10] has shown that the minimum next round outage probability (MNROP) strategy outperforms minimum total transmission power (MTP) strategy, the potential property of MNROP is keeping the network diversity. Therefore, we will discuss and analysis the diversity order of distributed estimation process in an inhomogeneous network system, and propose a improve power allocation strategy based on diversity information. Finally, the simulation result showed that proposed strategy can effectively maintain the contribution of high diversity order sensors, and has excellent performance on network lifetime.