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Ultra-wide band (UWB) technology considered as a solution in wireless communication to revolutionize high data rate transmissions. A microstrip monopole antenna with modified Y-shape patch is proposed in this paper, which operates at frequency 3.1–10.6 GHz with Reflection coefficient ≤ −10 dB. Proposed antenna has physical dimension of 24 × 25 × 1.6 mm and considered compact for certain wireless communication...
This paper presents an efficient new snapshot mechanism, briefed as Live Save, to make real time backup of the VM state to the local host. The proposed Live Save will iteratively send the state data, store the snapshot file in the local host and send the entire file directly to a remote host when necessary - to save significant bandwidth consumption. We also set up an advanced Improved Live Save which...
A quad-band energy harvester is proposed here. The harvester is formed of rectifiers and matching circuits at different frequency bands: GSM-900 (890-960 MHz), GSM-1800 (1800-1870 MHz), ISM 2.45 GHz (2.45-2.457 GHz) and LTE-band 7 (2.6-2.67 GHz). The harvester is formed of two dual-band matching circuits and two rectifiers instead of the conventional design with four single-band matching circuits...
This paper investigates the network function virtualization (NFV)-enabled multicast problem, and proposes a steiner tree-based algorithm to reduce the cost of virtual network function (VNF) deployment and routing. In the algorithm, to minimize the bandwidth consumption, the Steiner tree is constructed by taking all the destination nodes as the terminals. Then a interconnection node of the tree is...
In this work, an automatic gain control amplifier for high voltage spindle recording is proposed. It is composed of a fix-gain amplifier and a variable gain amplifier (VGA) with threshold detecting logic to control the gain of VGA. The system provides 3 different gain set: 54dB, 60dB and 66dB. The bandwidth of the system covers from 0.5Hz to 1.5 KHz. The power is 7.7uW, and the integral input referred...
In order to suppress the range sidelobes and the grating lobes of the linear stepped frequency waveform, a non-linear stepped frequency (NSF) waveform design method by using range ambiguity function is proposed in this paper. Firstly, the reason of the sidelobes and the grating lobes occurring is analyzed based on range ambiguity function. Secondly, through compare the difference between the modified...
This paper proposes a new frequency selective surface (FSS) using interdigital slot structure. By using the interdigital slot unit cell, the size can be reduced from A/2 of conventional one to A/8. Moreover, the proposed interdigital slot FSS can be applied with a dipole antenna to resonate at 1.8 GHz, resulting in a high gain of 8.43 dB. The radiation pattern is directional and bandwidth is about...
This paper presents an investigation of the effect of the antenna frequency band on the ground penetrating radar (GPR) image resolution. The investigation is achieved through simulations. In the simulations, two Scutcheon antennas are modeled as the receiving and transmitting antennas. A cross-shaped object is buried under the ground constructed with the dielectric material. The Gaussian pulses with...
In this paper, we study the dual-fed dual-polarized crossed bowtie antennas with different structure proposed for the radio telescope system in 300 MHz band. The performance of crossed bowtie antennas designed on the same surface (co-planar) and on different surface (stack-patch) are compared. The simulation of these antenna structures were carried out using CST Microwave Studio to determine the impedance...
This paper proposed a helical antenna in which circular parasitic rings are arranged inside a helical antenna. Compared to the gain boosting technique the traditional helical antenna, the height of the additional antenna does not increase. The gain of the proposed antenna is enhanced by a maximum of 2.5 dB in the working bandwidth by adding circular parasitic rings, while maintaining the Axial Ratio(AR)...
This paper proposes a new design of compact fractal patch microstrip antenna fed by coplanar waveguide to reduce the antenna dimension and to increase its bandwidth for Long Term Evolution application purposes. The results shown return loss of −23.45 dB and VSWR 1.144 can be achieved by controlling the height and the width of the fractal patch dimension. Bandwidth of the proposed antenna is 375 MHz...
Discriminating Distributed Denial of Service (DDoS) from Flash Crowds (FC) is a tough and challenging problem, because there are many similarities between each other existed in network layer. In this paper, according to an extensive analysis of user traffic behavior of DDoS and FC, it can be found that some traffic abnormalities are existed between Bots and legitimate users. So a behavior-based method...
Data dissemination among vehicles is an important problem in a Vehicular Ad Hoc Network (VANET). However, all existing works on data dissemination consider transferring small-sized data, where the entire data can be transferred from a roadside unit (RSU) to a vehicle when the vehicle is passing by it. In this paper, we address the problem of large data transfers among vehicles in a VANET using RSUs...
In this paper, we propose a novel distributed Kalman filter (KF) over sensor networks using partial diffusion strategy, where each sensor only communicates with its neighbours and individual estimation vectors are partially transmitted to obtain local ones through convex combinations under communication bandwidth constraints. Proposed solution can obtain a trade-off between communications burden and...
In this paper, the ultimate limit of the signal to nonlinear noise ratio (SNRNLI) for high bit rate system operating near zero-dispersion wavelength is calculated. Carried out simulations revealed that the shape coefficient (Φ) is a very important factor that must be taken into account in the theoretical model.
This paper evaluates the performance of the first-last-exact fit spectrum allocation policy for elastic optical networks. The first-last-exact fit spectrum allocation policy is intended to increase the number of aligned available slots and avoid small contiguous available slots, and hence suppresses the blocking probability. This policy separates the allocation of disjoint and non-disjoint connections...
The current design drivers for multi-cores, namely performance per watt, scalability and flexibility, make the Networks-on-Chip (NoCs) the de-facto on-chip interconnect. State of the art NoCs can exploit heterogeneous solutions and complex DVFS techniques to fulfill also the variability of the application requirements. Relevant showstoppers to the design of a truly flexible NoC fitting all the possible...
The Mobile Cloud Network is an emerging cost and capacity heterogeneous distributed cloud topological paradigm that aims to remedy the application performance constraints imposed by centralised cloud infrastructures. A centralised cloud infrastructure and the adjoining Telecom network will struggle to accommodate the exploding amount of traffic generated by forthcoming highly interactive applications...
This paper applies ADRC algorithm to the inverted pendulum stabilization problem. Since the extended state observer and control law can be nonlinear or linear, different combinations are designed to balance the pendulum's angle. It also offers a practical solution that the nonlinear parameters are tuned as the linear ones. The output response speed and control variable are compromised to determine...
Network Function Virtualization is a recent and significant development applied in cloud datacenters, which can help service providers manage network services more flexibly and economically than using middle-boxes. User requests may demand different numbers of services in a chain, where the related flows can be directed to different physical machines (PMs) hosting required virtual network functions...
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