This paper presents the design and implementation of a smart wireless sensor node,which is aimed to reduce the energy consumption of the wireless sensor network. On this basis, we set up the wireless sensor network, and realize the node-level and the network-level energy-efficiency. The node-level energy-efficiency, based on the a-daptive radio frequency power,assumes that the node can reduce the necessary output power automatically and ensure the reliable communication at the same time. The network-level energy-efficiency is realized through comparing the energy consumption of star network with that of tree network and then selecting the more efficient structure. Experimental test has proved that the designed sensor node is applicable to realize the adjustability of transmission power and network configuration.%设计了一种节能无线传感节点.该设计在智能节点的平台上,完成一个小型无线传感网络的搭建,实现“节点级节能”和“网络级节能”,从2个方面同时节约能耗,达到较好的节能目标.节点节能是通过传感节点的射频功率自适应来实现的,节点可以自动选取最小必要发射功率,在保证可靠通信的基础上实现发射功率最小；而网络节能则是通过估计星型网络和分簇网络2种结构下网络通信的耗能,然后选取耗能较小的结构形式来实现的.通过仿真和实验测试,证明这种节点和由这些节点构成的网络能够顺利实现节点发射功率自适应和组网结构自适应,达到了较好的节能效果.
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