把RSSI(Received Signal Strength Indication)测距技术引入到无线传感器网络的路由策略中,形成一种新型路由协议.该协议能有效减少节点能耗,从而增加了无线传感器网络的寿命.在NS2平台上,分别对LEACH协议和新型路由协议行了仿真.结果表明:新型路由协议下的网络寿命比LEACH的长;当网络工作在低负载的情况下,该新型协议的单位能耗下数据接收量比LEACH的要大.
In wireless sensor networks,sensor nodes need to send sensing data to the sink node.Due to the limitation on t...
Junjie Yuan,Qiang Ling,Jinfeng Yan,Weihua Zhang and Huihui Gu are with Dept.of Automation,University of Science and Technology of China,Hefei,Anhui 230027,China.
This paper studies the stabilizability of an n-dimensional quantized feedforward nonlinear system. The state of that system is first quantized into a finite number of bits, and then sent through a digital network to the controller. We want to minimize the number of transmitted bits subject to maintaining asymptotic stability. In the prior literature, n bits are used to stabilize the n-dimensional system by assigning one bit to each state variable (dimension). Under the stronger assumption of global Lipschitz continuity, this paper extends that result by stabilizing the system with a single bit. Its key contribution is a dynamic quantization policy which dynamically assigns the single bit to the most "important" state variable. Under this policy, the quantization error exponentially converges to 0 and the stability of the system can, therefore, be guaranteed. Because i is the minimum number of quantization bits (per sampling step), the proposed dynamic quantization policy achieves the minimum stabilizable bit number for that n-dimensional feedforward nonlinear system.