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Data backup in data center networks (DCNs) is critical to minimize the data loss under disaster. This paper considers the cost-efficient data backup for DCNs against a disaster with ε early warning time. Given geo-distributed DCNs and such a ε-time early warning disaster, we investigate the issue of how to back up the data in DCN nodes under risk to other safe DCN nodes within the ε early warning...
We demonstrate high-speed data transfer GridFTP using a multipath control mechanism with SDN (Software-Defined Networking). GridFTP is a typical tool that has been developed and widely used for bulk data transfer over a wide area network in the field. GridFTP supports a parallel high-speed data transfer scheme using multiple TCP streams. However, one of the shortest paths is used solely for data transfer...
LNA designed for 1 to 2.8 GHz frequency band using pHEMT ATF34143, is studied with respect to some remedies and worked on few factors which enhanced bandwidth of LNA with respect to improvement in Return loss as well as gain linearity. Earlier published work for designing LNA has been given some modification by disturbing Source reactance to meet optimum noise impedance closer to S11. As replacement...
The TCP/IP model is a widely used protocol at present time due to unparalleled popularity of the Internet. Although it is efficient and reliable it does not include the user into its architecture and thus leaves the user without any control over the underlying layers. While the default layering mechanism is set up in such a way that it would give efficient service to most of its clients, it does not...
Methods and software are developed for research the effects of phase dispersion, depending of the ionospher, based on LabVIEW. It is found that the leading edge increased with increasing of the third order parameter of impulse response, which leads to the case without the frequency dispersion, while trailing edge moving away from the peak, which leads to the case of linear frequency dispersion. Ionospheric...
This paper will present a methodology to optimize the design of a mismatch filter using the least squares solution. This approach utilizes two parameters referred to as the designed mainlobe width and the diagonal loading value. The metrics under consideration for this filter design are mainlobe width, peak sidelobe level (PSL), mean sidelobe level (MSL), and mismatch loss. Using this technique significant...
This paper presents and evaluates, by simulation, the feasibility of a new type of spectrum controlled waveforms for use in a cognitive radar operating in a spectrally dense environment. The addressed scenario is constituted of a wideband radar with cognitive functionalities and a number of narrow band communication services working in frequency hopping mode. The paper proposes the use of a special...
L-3 Electron Devices Division (EDD) has developed a compact CW E-band microwave power module (MPM) to cover the 81 to 86 GHz band for communications applications. The power amplifier in the MPM is a periodic permanent magnet focused serpentine waveguide TWT, capable of over 200 W and 50% efficiency. In combination with a predistortion linearizer from LTI, the MPM will provide over 50 W linear power,...
Due to insufficient network infrastructure, tactical networks suffer the imbalance between network resource supply and transmission demands generated by deployed sensing devices. On top of that, those sensing devices are in multiple modalities with the need of fusing diverse inputs into unified formats to provide answers to query tasks. We addressed issues under network resource constraints on exploiting...
The traditional approach of clearing and reallocating wireless spectrum is becoming increasingly difficult. This has led to much interest in new approaches for sharing spectrum among different users, including the three-tiered model currently being developed for the 3.5 GHz band. In this model, commercial service providers (SPs) are allowed to access government spectrum in one of two tiers: a Priority...
Combining Network Functions Virtualization (NFV) with Software-Defined Networking (SDN) is an emerging solution to provide fine-grained control over scalable and elastic packet processing functions. Due to changes in network policy, traffic characteristics, or physical topology in Software-Defined NFV (SDNFV) systems, the controller needs to carry out network updates frequently, i.e., change the data...
We see a trend to design services as a suite of small service components instead of the typical monolithic nature of classic web services, which led to an increasing amount of long-tail services on the Internet. Deploying instances everywhere to achieve a fast response time results in high costs, especially when these services are used infrequently and remain idle most of the time. One way to avoid...
Large enterprises require reliable and scalable network connectivity which relies heavily on correct network design for LAN and ample bandwidth on WAN. The latter is mostly affected by external market-defined prices, which, absent careful optimization and estimation, can result in unnecessary business expenses. This paper presents a framework for network capacity forecast of a large enterprise to...
Data aggregation for VANETs is considered a vital building block for many applications due to its bandwidth saving potential. In this paper, we propose a novel context aware data aggregation technique for VANETs. The data aggregation is done by the cluster head based on the context i.e. vehicle speed and density to reduces the required bandwidth for periodic data dissemination. The proposed technique...
In recent years, the number of requests to transfer large files via large high-speed computer networks has been increasing rapidly. Typically, these requests are handled in the “best effort” manner and resulting in unpredictable completion times. In this paper, we consider a model where a transfer request either must be completed by a user-specified deadline or must be rejected if its deadline cannot...
Due to the predictable nature of network transfers in media production industry, advance bandwidth reservation results in higher bandwidth utilization and improved network performance. However, in unreliable networks, this may fail. As a first provisional stage, deploying protection mechanisms ensures that the schedule remains valid when the system is in operation. Constant monitoring and modification...
Today is world of electronics gadget's which generates voluminous data that includes the various forms of multimedia data. In these data collections images need more space to store the content and need more bandwidth to transmit through network. By using Image compression the size of the image can be reduced which helps in less utilization of memory and transmitted across network with less bandwidth...
Long Term Evolution (LTE) is a technology, based on Third Generation partnership project (3GPP) which provides high data rates in the order of several hundreds of Mbps for data transmission. In order to achieve high data rates with good amount of spectral efficiency, it is required to allocate resources optimally. Physical Downlink Control Channel (PDCCH) is used to provide control information to...
With the rapid development of cloud computing, data center's resource management has become a critical component in its business model. CPU, memory and network in a data center have many effective partitioning methods among the virtual machines that could offer high-efficiency, enhanced fairness and performance guarantee. However, in existing software based virtualization architecture (e.g., Xen),...
The aim of this research is to enhance the performance of a traditional Open Shortest Path First (OSPF) routing protocol network by adding some features of the Software Defined Networking (SDN) in a modified approach to improve some network's performance metrics like link congestion and bandwidth utilization. The improvement of those metrics leads to an improvement in the total throughput of the network...
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