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Uptime is very important with any computer system, because a solution which is not available cannot be relied upon to provide accurate information in a timely and routine manner — usually resulting in the loss of time, revenue, or data. Highly-available systems and websites rely on eliminating single points of failure, and on reacting quickly to any network, hardware or software issues which may occur...
The impact of cloud computing and sharing physical resources simultaneously between several virtual instances can be crucial for the designing real-time and time-critical applications. This especially applicable to cases when the target is to deliver reliable network services. In this paper, we primarily aim at investigating the timing behavior in the cloud environments where the resources are shared...
In this paper we make an overview of carrier aggregation and MIMO technologies used in LTA-Advanced to improve system performances. Then we analyze the transmission of video streams over LTE-Advanced network in downlink and uplink direction. In order to maximize resource utilization, we propose a method for calculating the maximum number of video calls that can be transmitted within a single cell...
An architecture for hardware realization of a system for sparse signal reconstruction is presented in the paper. The threshold based reconstruction method is considered. Noise, appearing in the signal as consequence of the missing signal samples, is used to derive the threshold. The threshold is then used in order to separate signal and non-signal components, and it is dependent on the number of missing...
The multiview video-plus-depth format provides a promising solution for the transmission of three-dimensional video. This format can be transmitted using the multiview high efficiency video coding (MV-HEVC) standard, where the texture and the depth videos are encoded and transmitted separately. The depth maps have large homogeneous areas making their downsampling before transmission and their upsampling...
In this paper, advanced link-budget calculations for microwave receivers are introduced. Microwave receivers typically consist of narrowband circuits in the high frequency part and broadband circuits in the baseband part. In general narrowband circuits and broadband circuits are characterized in different ways. Narrowband circuits are described by impedance matching, power gain and noise figure while...
The University of Applied Sciences Technikum Wien offers various courses dedicated to electronic engineering and embedded systems hardware & software design. These courses are embedded in various degree programs such as full-time, part-time, and distance learning. The attendees of these courses train their skills and expertise on the basis of labor exercises, assignments, and tasks. Especially...
In this Paper, a Particle Swarm Optimization based solution is proposed to solve the problem of model order reduction for high order transfer functions. The main advantages of our approach are that it is generic, with relatively small time and reasonable accuracy. Moreover, it preserves both time and frequency responses of the original transfer function.
In this study a numerical cryptanalysis of a random number generator (RNG) which is built on a continuous-time chaotic oscillator is introduced. In order to scrutinize the security weaknesses of the RNG, a master-slave synchronization approach is presented as the basis of an attack scheme. By proposing this attack scheme, it is aimed to verify whether there exist any possibility to divulge the hidden...
In this paper, a maximum power point tracking (MPPT) architecture for micro-scale photovoltaic (PV) energy harvesting systems is presented. A switching DC-DC boost converter is used to provide the required voltage for the circuits of the ultra-low-power application. The MPPT tracks different illumination intensities through changing the input impedance of the boost converter. The proposed technique...
The linearization approach that exploits the modified baseband signal is applied in this paper to linearize a two-way broadband Doherty power amplifier. The required linearization signal formed as a product of the second-order nonlinearity of a nonlinear system is adequately processed in amplitude and phase in the digital domain. Then, the fundamental carrier second harmonic is modulated by the tuned...
Action recognition from video streams is among the active research topics in computer vision. The challenge is on the identification of the actions robustly regardless of the variations imposed by appearances of actions performed by different people. The challenge increases when the data is gathered from an outdoor environment, i.e. background and illumination variations. This paper proposes a Hidden...
Signal adaptive multiple-clock-cycle, but also completely pipelined hardware implementation of the optimal (Wiener) time-frequency filter is proposed in this paper. The verification of the proposed design is provided, as well as the most implementation details and the extensive comparative analysis. All significant characteristics of the corresponding recently proposed signal adaptive filtering solution...
This paper presents a novel circuit implementation for overcurrent protection of low-dropout voltage regulators, that is able to limit the maximum current the regulator can source into the load to a value set by the user and to keep the current limit value fairly independent of process variation and output voltage, as well as maintaining its temperature drift over the wide temperature range of −50°C...
Parallel Sequence Spread Spectrum (PSSS) is a physical layer (PHY) baseband technology that is well suited for mixed-signal transceiver implementation for high data rate wireless communication systems. Mixed signal baseband realization allows for easier implementation of the channel equalization function and eliminates the need for high speed data converters. System design and architecture of a mixed...
This paper studies the Hall mobility of Hall structures integrated in two CMOS technological processes, regular bulk and Silicon on Insulator respectively. The main character of this study is the Basic Hall cell, for which accurate dimensions (length and width of the active region, electrical contacts size and area of the p-substrate) are given. To this purpose, three-dimensional physical models are...
Network on Chip (NoC) has emerged as an interconnection solution for the modern digital systems, especially for System on Chip (SoC), due to the large number of IPs in the system that need to communicate. Various systems and routers have been introduced; hence the need to make a reusable verification environment to test both single routers and networks. In this paper, we propose a reusable verification...
Accurate and robust state estimation is a fundamental problem in signal processing. Particle filter is an effective tool to solve the filtering problem in nonlinear stochastic dynamic systems. However, when the system is mean-field dependent and the data is high-dimensional in spatial and temporal domain, the estimator may become inaccurate or even diverge. In this paper, we propose a Correlative...
This paper proposes an efficient algorithm for noise level estimation in still images. The images are assumed to be corrupted by additive white Gaussian noise. The proposed method relies on block-based image segmentation and Gaussian filtering to estimate the standard deviation of Gaussian noise. The proposed method employs adaptive image segmentation, where the size of segmentation blocks is derived...
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