无线射频识别(radio frequency identification,RFID)系统中的标签识别速率直接决定了系统性能,设计一个高效的标签防碰撞方法能够有效提升读写器的识别效率,并降低读写器和标签所消耗的能量.在分析已有的两类防碰撞算法性能的基础上,...无线射频识别(radio frequency identification,RFID)系统中的标签识别速率直接决定了系统性能,设计一个高效的标签防碰撞方法能够有效提升读写器的识别效率,并降低读写器和标签所消耗的能量.在分析已有的两类防碰撞算法性能的基础上,提出了一类融合帧时隙ALOHA思想与二进制树思想的新型防碰撞算法.4种新型算法在算法性能上稳步提升,系统能量消耗也呈递减趋势,特别适合手持式电池供能的读写器.仿真结果表明,自适应帧的二进制防碰撞算法(SA-FBS)在减少碰撞时隙上明显优于传统的防碰撞算法.展开更多
In wireless sensor networks（WSNs）,appropriate topology control（TC）could efficiently balance the load among sensor nodes and extend network lifespan.Clustering is an effective topology control technique that could ...In wireless sensor networks（WSNs）,appropriate topology control（TC）could efficiently balance the load among sensor nodes and extend network lifespan.Clustering is an effective topology control technique that could reduce energy consumption and provide scalability to WSNs.However,some clustering algorithms,including the traditional low energy adaptive clustering hierarchy（LEACH）,don＇t consider the residual energy and the communication distance.The energy consumption could dramatically increase in the case of long communication distance and high rate of control message exchange.In this paper we propose an energy-balanced clustering algorithm which considers the communication distance and the residual energy.Moreover the cluster head（CH）reselection is relevant to the current CH residual energy in order to reduce overheads.The simulation results demonstrate that the proposed algorithm prolongs the lifetime of the WSN in comparison to the LEACH and a hybrid clustering approach（HCA）.展开更多
We explore the tracking problem of a maneuvering target. Tracking agents with third-order kinematics can com- municate with each other via wireless network. The communication network topology is arbitrary rather than ...We explore the tracking problem of a maneuvering target. Tracking agents with third-order kinematics can com- municate with each other via wireless network. The communication network topology is arbitrary rather than switches among several fixed topologies. The information sharing and interaction among agents are position, velocity, and accel- eration. Some sufficient conditions of tracking strategy have been proposed. Finally, a numerical example is employed to demonstrate the effectiveness of proposed tracking strategy.展开更多
This paper studies the multi-agent tracking problem of a third-order maneuvering target under uncertain communication environments. Each tracking agent is assumed to be a third-order system and can only use its own an...This paper studies the multi-agent tracking problem of a third-order maneuvering target under uncertain communication environments. Each tracking agent is assumed to be a third-order system and can only use its own and neighbors＇ position, velocity, and acceleration information to design its control input. In this work, the uncertain communication environments are modelled by a finite number of constant Laplacian matrices together with their corresponding scheduling functions. Sufficient conditions for the existence of a tracking strategy have been expressed in terms of the solvability of linear matrix inequalities. Finally, a numerical example is employed to demonstrate the effectiveness of the proposed tracking strategy.展开更多
Consensus problem of second-order leader-following multi-agent systems under arbitrary topology is investigated in this paper.Arbitrary topology means the variable topology shifts continuously rather than switches amo...Consensus problem of second-order leader-following multi-agent systems under arbitrary topology is investigated in this paper.Arbitrary topology means the variable topology shifts continuously rather than switches among several different structures.For ensuring the consensus of leader-following multi-agent systems,some sufficient conditions and controller design principles are deduced both for a double-integrator case and a nonlinear case.Certainly,numerical simulations are carried out to prove the feasibility and effectiveness of theory derivation,which vividly illustrates that the following agents can successfully track the leader agent.展开更多
文摘无线射频识别(radio frequency identification,RFID)系统中的标签识别速率直接决定了系统性能,设计一个高效的标签防碰撞方法能够有效提升读写器的识别效率,并降低读写器和标签所消耗的能量.在分析已有的两类防碰撞算法性能的基础上,提出了一类融合帧时隙ALOHA思想与二进制树思想的新型防碰撞算法.4种新型算法在算法性能上稳步提升,系统能量消耗也呈递减趋势,特别适合手持式电池供能的读写器.仿真结果表明,自适应帧的二进制防碰撞算法(SA-FBS)在减少碰撞时隙上明显优于传统的防碰撞算法.
基金Supported by the National Natural Science Foundation of China(6104086)Scientific Research,Postgraduate Training Joint-Build Project(20120639002)
文摘In wireless sensor networks（WSNs）,appropriate topology control（TC）could efficiently balance the load among sensor nodes and extend network lifespan.Clustering is an effective topology control technique that could reduce energy consumption and provide scalability to WSNs.However,some clustering algorithms,including the traditional low energy adaptive clustering hierarchy（LEACH）,don＇t consider the residual energy and the communication distance.The energy consumption could dramatically increase in the case of long communication distance and high rate of control message exchange.In this paper we propose an energy-balanced clustering algorithm which considers the communication distance and the residual energy.Moreover the cluster head（CH）reselection is relevant to the current CH residual energy in order to reduce overheads.The simulation results demonstrate that the proposed algorithm prolongs the lifetime of the WSN in comparison to the LEACH and a hybrid clustering approach（HCA）.
基金Project supported by the National Natural Science Foundation of China(Grant No.61104086)the Scientific Research and Postgraduate Training Joint-Build Project of China(Grant No.20120639002)
文摘We explore the tracking problem of a maneuvering target. Tracking agents with third-order kinematics can com- municate with each other via wireless network. The communication network topology is arbitrary rather than switches among several fixed topologies. The information sharing and interaction among agents are position, velocity, and accel- eration. Some sufficient conditions of tracking strategy have been proposed. Finally, a numerical example is employed to demonstrate the effectiveness of proposed tracking strategy.
基金supported by the National Natural Science Foundation of China(Grant No.61104086)the Scientific Research,Postgraduate Training Joint-Build Project(Grant No.20120639002)the China Scholarship Council(Grant No.201306030027)
文摘This paper studies the multi-agent tracking problem of a third-order maneuvering target under uncertain communication environments. Each tracking agent is assumed to be a third-order system and can only use its own and neighbors＇ position, velocity, and acceleration information to design its control input. In this work, the uncertain communication environments are modelled by a finite number of constant Laplacian matrices together with their corresponding scheduling functions. Sufficient conditions for the existence of a tracking strategy have been expressed in terms of the solvability of linear matrix inequalities. Finally, a numerical example is employed to demonstrate the effectiveness of the proposed tracking strategy.
基金Supported by Scientific Research and Postgraduate Training Joint-Build Project(20120639002)the National Natural Science Foundation of Youth Science Fund(61104086)
文摘Consensus problem of second-order leader-following multi-agent systems under arbitrary topology is investigated in this paper.Arbitrary topology means the variable topology shifts continuously rather than switches among several different structures.For ensuring the consensus of leader-following multi-agent systems,some sufficient conditions and controller design principles are deduced both for a double-integrator case and a nonlinear case.Certainly,numerical simulations are carried out to prove the feasibility and effectiveness of theory derivation,which vividly illustrates that the following agents can successfully track the leader agent.
