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The high frequency voltage oscillation on the DC/DC gate driver of a H-bridge created during the turn-off intervals of the power switches has critical impact on component reliability and control quality. This noise can propagate freely in the low power plane to other functional circuits of the converter due to the performance degradation of EMI filter in high frequency range above 30MHz. In this paper,...
Considering the imminent migration of services to the Ka- and Q-bands, a payload dedicated to propagation measurements in these bands has become available from the Alphasat satellite under the coordination of the European Space Agency. This has strongly motivated the formation of many measurement campaigns across Europe in an effort to enhance the scientific databases with new, more reliable propagation...
Random number generators have become an essential part of our modern life, in ways that average consumers seldom appreciate. Much of modern communication and digital storage relies on cryptography to ensure privacy, security, and authentication. Random number generation is a critical process that underlies all of these methods. The rapidly increasing demand for bandwidth, storage, and computation,...
The impedance modeling of passive device is mandatory for EMI prediction of power converter on printed board circuit (PCB) level. The black-box node-to-node impedance function (NIF) model, which extracts the connecting impedance matrix from measurement, can be used as the most general representation. However, the most recent development of this model is still based on the assumption of ideal shorting...
An overview of ASKAP phased array feed (PAF) development is presented. New analytical and experimental techniques devised for ASKAP are described. Dedicated engineering test facilities are shown to be invaluable for system verification. Experience gained from PAF manufacture is compared with forecasts, and the importance of routine engineering demonstrated.
It is well-known that for analysis and interpretation, ultrasound images are the sources of information with cost effective and disclose the usage of hassle free environment. When an image of information is converted from one form to another using a commonly available process such as digitizing, scanning, transmitting, storing, the performance of the transformed image gets degraded up to some extent...
In pre-processing of spectral data, advancements are yet to be made to discover the most efficient filter and establish parameters which define efficiency. In this paper, a unique method of using the Kalman filter for filtering the spectral data is proposed. Not only is it found that the performance of the Kalman filter is better but also observed that the filter provides better noise suppression...
This letter presents an RF noise model for AlGaN/GaN HEMTs. The model is based on active line approach and concept of two ports linear noise theory. Short channel effects such as channel length modulation and velocity saturation are considered in the model. The noise generated from the pinch off region is taken into account as well. Some of FET noise parameters are calculated and experimentally verified.
This paper addresses several issues which are novel in respect of the rapidly-evolving state of the art of low-terahertz radars: firstly, the sensitivity available from currently-available radars, secondly the likely effects of source noise and thirdly the effects of the fact that even relatively small targets, like people, occupy more than one resolution cell, as a consequence of the high resolutions...
Breast Cancer is one of the major causes of death among women. Early diagnosis can improve the patient's survival rate. Traditional diagnosis method such as biopsy is not much efficient. However due to the large scale of the medical image data, Inspired by the advanced computing technology which is capable of performing image processing using computer aided diagnosis (CAD) systems to assist clinicians...
Relay feedback approach plays prominent role for the identification of various lag-dominated processes in the process industries. A simple method is proposed for the identification of bench-marked practical examples. Relay with hysteresis is used as excitation signals in order to reduce the measurement noise in the identification process. Using the single symmetric relay test the parameters such as...
Bayesian network is a probability, which is based on a probabilistic inference network of graphical and Bayesian formula is the basis of the probability of network. The paper analyzes general Semantic pixel naming and the implementation process and concept of Bayesian per pixel segmentation (BPPS). On this basis, author presents a novel deep learning framework for clustering and information mining...
A generally accepted noise model of a FET without gate leakage current requires the knowledge of the elements of an equivalent circuit and three temperatures: physical temperature Ta and equivalent temperatures, Tg of intrinsic gate resistance and Td of drain conductance. Experimental confirmations have been published for III-V FETs and HEMTs and also for MOSFETs. There is, however, still a disagreement...
This contribution aims at studying the input impedance of household appliances in the frequency range from 9 kHz to 500 kHz (FCC band). The method using the network analyzer is chosen as it provides a very good trade-off between required accuracy and ease of use. Some of the most common household appliances present in customer installations are characterized in terms of impedance in their respective...
The results of noise-resistant speech signal processing, with the use of linear adaptive filters. To enhance the filtration efficiency, the filtration is proposed to use a cascade signal. This approach improves the noise resistance of the signal. A comparative analysis of the performance of the developed algorithm with known methods of filtration. The effectiveness of the proposed filter is demonstrated...
In spite of many exclusive advantages of the switched reluctance motor (SRM), acoustic noise of this motor is high and it is necessary to do more research on the noise reduction which is the main objective of the present paper. The noise reduction procedure proposed here is included three separate parts: (1) stator design parameters optimization, (2) rotor pole design shape optimization and (3) inserting...
Nonlinear dynamics of a microwave optoelectronic oscillator was investigated for the first time with the use of time series analysis. The detailed study of the generated microwave waveforms showed a route from stable monochromatic oscillations to noise through a series of bifurcations. The oscillator demonstrated the periodic and chaotic dynamics in the intermediate regimes of self-generation. Peculiarities...
Localization is a crucial part in robot navigation. The significance of this issue is to the extent that further achievements in terms of robot control is highly dependent on that. There are various methods addressing this subject, among which the extended Kalman filter is proved to be one of the most successful ones. In classic extended Kalman filter, covariance matrixes of process noise Q and measurement...
In marine science, underwater sensor networking (UWSN) is the most important and interesting arena. A novel noise aware Level Based Routing Protocol (LBRP) is proposed in this paper to contribute in this field. The LBRP is essentially a level-based routing protocol. State information is not needed to be stored and only a small portion of the total nodes are engaged in routing. It also promises the...
Do statistical methods developed for NRZ signals work for PAM-4 modulation? Not entirely. We show that some basic principles (e.g., edge-based analysis, conversion of jitter PDF into vertical noise) remain valid, but the solution flow should be modified. Modifications include: the number of PMF accumulators, their initialization and input-output connections, weight factors, transition probabilities,...
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