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Sheer volumes of data are being generated in extreme-scale distributed scientific applications, and need to be transferred remotely in fast, predictable and reliable way for data storage and analysis purpose. Reserving bandwidth along selected paths in high-performance networks (HPNs) has proved to be an effective way to satisfy the high-demanding performance requirements of such data transfer. However,...
This paper studies the design of standard CMOS two-stage operational amplifiers under power consumption and area constraints. The focus of the work is unity-gain bandwidth optimization, which is achieved by means of a procedure based on numerical analysis that allows determining the optimum sizing of op-amp transistors and the compensation capacitance as well as the best splitting of the allowed bias...
The dead-time and the other inverter nonlinearities known as the inverter non-idealities affect the output voltage and current distortions especially at low output voltages. The inverter non-idealities could be modeled as disturbances acting on the plant's (motor's) input. This paper discusses the effect of current controller design on the rejection of inverter non-idealities induced disturbances...
The future wireless broadband technologies will offer bandwidth intensive services such as rich voice and high definition multimedia. The aggregate bandwidth requirement at base station of a wireless broadband network is the sum of bandwidth requirements from various services viz., VoIP, browsing, e-mail, streaming multimedia, interactive gaming etc. Due to variation in rates of arrival of service...
As Software-Defined Networking (SDN) continues to mature and proliferate, many large computing and storage facilities are now connected by high-speed links to support global scientific collaboration. In such dedicated network environments, bandwidth scheduling plays a critical role in improving the utilization of network resources and meeting diverse user requests. In this paper, we formulate a periodic...
Performance analysis of the combined guard channels and Mobile assisted (M+G) handoff call admission control for two customer types is performed. A wireless cell which serves two types of calls; n-type (narrowband) and w-type (wideband) is considered. The total numbers of channels in the cell are divided into common and reserve channels. Originating calls are only served from the common channels,...
To address the challenge of unprecedented growth in mobile data traffic, ultra-dense network deployment is a cost efficient solution to offload the traffic over some small cells. The overlapped coverage areas of small cells create more than one candidate access points for one mobile station. Signal strength based user association in IEEE 802.11 results in a significantly unbalanced load distribution...
Personal cloud storage systems, like Dropbox, are revolutionizing the way people think about and access their files. As the prevailing model, these systems use unicast to push file changes to each of the "unsynced" devices. And as a result, they transmit multiple times the same information, once per unsynced device. This puts an unnecessary strain on outgoing bandwidth at the datacenters...
In recent times, there has been an increase in the number of mobile devices to access a variety of services on radio access network, and the trend is expected to continue. In addition, ultra-low latency services require much bandwidth and often characterized by having extremely short delay constraints. Hence, satisfying required strong QoS requirement becomes challenging task. Existing scheduling...
Low sensitivity and wide control bandwidth are required in order to achieve fast and precise positioning of mechatronic systems. However, it is difficult for the system with multiple vibration models to enlarge control bandwidth while maintaining closed-loop stability and reasonable stability margins. This is because the explicit index for determining control bandwidth has not been proposed. This...
S-parameter is commonly used for channel modeling and crosstalk modeling between channels in high speed digital design. However, for I/O buffer circuit designer, S-parameter models are not well received owing to all general frequency domain data is difficult to incorporate into a transient circuit simulation. S-parameter is a frequency domain data and is difficult to deal in a transient circuit simulation...
Recent studies have demonstrated that millimeter-wave cellular networks may operate either in the noise-or in the interference-limited regime, depending on several parameters, which include the density of base stations, the density and size of obstacles/blockages, the antenna beamwidth, and the transmission bandwidth. The objective of the present paper is to exploit tools from stochastic geometry...
Orthogonal Frequency Division Multiplexing (OFDM) technique is widely used due to its high spectrum efficiency. It is used as physical layer standard in 802.11a WLAN standard & Digital Video Broadcasting-Terrestrial (DVB-t). The Fourth generation wireless communication standards are based of OFDM. Traditionally, Fast Fourier Transforms (FFT) has been used to produce the orthogonal sub-carriers...
Stencil computation is an important class of algorithms used in a large variety of scientific-simulation applications. The performance of stencil calculations is often bounded by memory bandwidth. High-bandwidth memory (HBM) on devices such as those in the Intel® Xeon Phi™ ™200 processor family (code-named Knights Landing) can thus provide additional performance. In a traditional sequential time-step...
The problem of detecting an unknown signal embedded in white Gaussian noise is addressed. The detector based on Wilcoxon signed-rank test is proposed as the solution for this problem. The detector analyses the spectrum of a received signal. Detection capability of this detector has been evaluated via mathematical modeling. Comparison with other prevalent detectors has been done.
In this study, the ultra-wideband (UWB) technique and its capability to detect the cells and layer of a human organs in medical scanning applications has been considered. Advantages and disadvantages of the technique has been highlighted with respect to the capability and accuracy of a medical scanning system especially those using the pulse reflected-based technique. The study contrasts the difference...
The wide range of modern industrial applications demand on extremely high performance of motion control systems in terms of tracking accuracy and therefore control bandwidth. The paper presents a novel dynamic model feedforward quasi-continuous servo drive control approach with regular current feedback sampling implemented on FPGA. Compared to the conventional DSP-based systems the current and the...
Geographically Weighted Regression (GWR) is a local version of spatial regression that captures spatial dependency in regression analysis. GWR has many application in practice as a visualization and prediction tool for spatial exploration (e.g in climate, economy, medical). However, this locally regression model is slow in process upon the volume of calculations and the spatial getting bigger. Improving...
Opportunistic Network has become an international hotspot in according with the popularity of various mobile intelligent terminals. But the nodes with limited communication capabilities cannot satisfy the growing of large content data transmission. Aim to these issues, we propose a novel communication capacity calculation model of Opportunistic Network based on the classical Random Direction mobile...
Network function virtualization (NFV) has drawn much attention in recent years, where some network functions that used to be deployed on specific hardware have become virtualized instances on general servers to achieve more scalability and flexibility. In a data center, service function chaining (SFC) makes a workflow traverse different network functions in a specific order to provide different levels...
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