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Articles by Ang Gao
Total Records ( 4 ) for Ang Gao
  Ang Gao , Wei Wei and Xiangrong Xiao
  Wireless Sensor Networks (WSNs) are often deployed in hostile environments, thus being subjected to great security risks. Secure authentication between the two participating entities is of typical defense against data modified and fabricated by an adversary. In this study, considering environment and dynamic topology having a significant impact on the communication radius of sensor, we proposed a secure Multi-hop authentication scheme: the data message source is verified with keys derived from multiple one-way hash sub-chains related to communication radius of node, while offering greater resilience against node compromised by designing the hash chain length which guarantees that sub-chains are picked with the low probability of overlap between two or more sensors. Compared to existing solution, the proposed method greatly alleviates extra memory space taken and lower energy consumption extends the network lifetime benefiting from the distributed strategy.
  Wei Wei , Ang Gao , Bin Zhou and Yiduo Mei
  A number of recent advances in MAC protocols for wireless sensor networks have been proposed to decrease idle listening. Low-Power-Listening (LPL) protocols transmit data packets for the inter-listening interval, for this reason, allowing sensor nodes to sleep for long periods of time between channel probes. The inter-listening interval as well as the particular type of LPL protocol ought to well match the network conditions. Some LPL protocols break communication between the sender and the receiver after the data packet has been successfully received. In this study, a novel variable rate based time frame scheduling scheme is proposed to further reduce collisions and improve energy saving in wireless sensor networks. During this pre-schedule slot, each node knows exactly the schedule of other neighbor nodes. Multi-rate and power scaling are adopted to achieve further energy saving by employing an acceptable rate rather than the maximum rate. Data rate is dynamically adjusted according to the traffic load of sending nodes in an energy efficient data rate to retrench energy. Compared with Z-MAC, performance in the present study proves to have better ability of local framing pre-schedule and multi-rate achieves better energy efficiency. Our results show that using the improved method of the MAC schedule provides up the enhancement of lifetime for different traffic scenarios.
  Wei Wei , Bin Zhou , Ang Gao and Yiduo Mei
  A number of practical events result in a natural information potential field in the proximity of the phenomenon. A novel method is proposed in this study to approximate the information potentials fields in Wireless Sensor Networks (WSNs). The moving least-square method is introduced to solve related Partial Differential Equations (PDEs). This equation determines a smooth edition of the intrinsic potential field maintained major characters which is propitious to most applications of WSNs. For instance, navigation in parking yards, temperature, motion or pollutants, etc. The association between the nodes and the local information level are also considered in this method. Various information potentials fields can be integrated together naturally attribute to the well property of the PDEs. Efficiency and stability of our scheme are verified by numerical examples. The simulation results make clear that the presented way is advantageous to be used in WSNs.
  Haibo Wu , Musheng Deng , Liaoliang Xiao , Wei Wei and Ang Gao
  Localization is significant for various applications in Wireless Sensor Networks. It is found that the estimated hop-distance will affect localization result. In this study, we propose a Cosine Theorem-based DV-hop localization algorithm (CTDV-hop) to improve localization precision. After estimating the average hop-distance by the traditional DV-hop technique, we select the middle node between every two anchor-pairs in the transmission route one by one. Then the estimated hop-distance is adjusted by the angle between the anchor-pairs to that selected middle node. We hence obtain the improved localization results and can accurately locate even the distribution of nodes is non-uniform. The simulation results illustrate that the CTDV-hop algorithm effectively improves the localization precision without extra energy consumption in networks.
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