This article explores the short-range dependence （SRD） and the long-range dependence （LRD） of self-similar traffic generated by the fractal-binomial-noise-driven Poisson process （FBNDP） model and lays emphasis on the former. By simulation, the SRD decaying trends with the increase of Hurst value and peak rate are obtained, respectively. After a comprehensive analysis of accuracy of self-similarity intensity, the optimal range of peak rate is determined by taking into account the time cost, the accuracy of self-similarity intensity, and the effect of SRD.
In this letter a fiber Bragg grating (FBG) interrogation system based on thermistance and matching-FBG of temperature sensitivity enhancement is proposed and demonstrated.According to the relationship between the center wavelength of the matching-FBG and the resistance value of the thermistance,the scheme interrogates the wavelength-shift by adjusting the matching-FBG’s temperature and detecting the resistance value of the thermistance.In measure experiments,the results show that the precision of the proposed system is 0.048 nm in a range of 9.4 nm.
Ample medium access control （MAC） protocols for Ad hoc networks have been proposed. However, most oal （PHY） layer and the MAC layers. Therefore, their efficiencf them do not take into account the interactions between the physicy and feasibility are greatly limited. In this article, we present a novel MAC protocol for Ad hoc networks according to the idea of cross-layer design. The proposed protocol combines an MAC protocol termed dual busy tone multiple access （DBTMA） with Orthogonal frequency division multiplexing （OFDM） system in IEEE 802.1 la standard. The analysis showed that the proposed protocol provides higher throughput and is more flexible than previous MAC protocols. In addition, it can provide Quality of Service（QoS） guarantee to the packets with different delay requirements in the presence of hidden terminals.
