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A dynamic bias pre-amplifier based latch type comparator is designed in a 65nm CMOS process. Its performance is compared with the double-tail latch-type comparator fabricated on the same chip in terms of energy consumption, input referred noise and speed. Measurements demonstrate that the proposed dynamic bias pre-amplifier based comparator consumes 2.8 times less energy per comparator operation with...
In this paper are presented the results obtained after of evaluating three techniques of blind detection of spectrum holes used in Cognitive Radio (CR). The techniques evaluated correspond to the general technique of detection of energy levels, the method LAD BASED and the technique based on forward methods. The operation of these techniques was tested in simulation scenarios of a telecommunications...
This paper investigates the influence of the signal to noise ratio (SNR) and the type of a noise on the performance of two adaptive novelty detection methods. The evaluated methods are Learning Entropy (LE) and Error and Learning Based Novelty Detection (ELBND). The methods are compared in empirical way in classification framework. A classification based only on the error of the adaptive model was...
The standard DC and RF and characteristics were measured for the 28 nm p- and n- type MOSFETs. The charge based compact model EKV3 parameters were extracted and verified against measured data. Noise parameters for both n- and p-MOSFETs were measured and analyzed in terms of gate induced noise correlation with the drain current noise, short channel effects related noise. The PRC noise model as well...
A method for separating and accurately estimating ADC noise, aperture jitter, and clock jitter is presented for ADC testing and characterization. This significantly relaxes clock jitter requirements and removes the need for high precision test instruments, but still allows ADC specifications like SNR, SNDR and ENOB to be accurately estimated.
The inter-carrier interference (ICI) caused by Doppler spread in mobile channels affects the OFDM orthogonality. This paper presents a comparative study of the performance of different low complexity methods to estimate the ICI power present in mobile reception. In addition, a new method based on experimental results is proposed. Several computer simulations based on OFDM systems with Log-likelihood...
This paper presents a brief review of recent dc arc fault modeling and detection methods. The goal is to examine state-of-the-art technologies and to identify future research and development needs of dc arc fault protection in modern dc networks. For dc arc modeling, the focus is given to external characteristic equations which model the arc with electrical parameters. Moreover, models of the random...
This paper discusses the signal to noise ratio (SNR) improvement at the antenna receiver system output using non-Foster matching. High mismatch loss in an antenna reduces the external noise power below the internal noise floor which results in a lower SNR than expected appearing at the input of the receiver. Non-Foster matching can minimize the mismatch loss but also adds its own noise to the receiver...
The paper deals with research of energy characteristics of multilevel modulation techniques for modern broadband radio systems. The problems of modeling and analysis of digital data transmission channel are considered
A quadrupole illumination scheme with specific phase distribution at the excitation elements is proposed in order to improve the noise performance of microwave imaging systems. In comparison with conventional single antenna illumination, the proposed system features simpler calibration while at the same time drastically improving the signal-to-noise ratio. An application with planar scanning is considered...
In the era of technology, signal transmission or signal recording is inseparable with the advent of noise. This study aims to eliminate noise (noise) on the ultrasonic signals to dolphins recording voice, as well as to determine the level of decomposition and the best kind on wavelet threshold with evidentiary value of SNR (Signal to Noise Ratio). Haar wavelet type is used in this study. One of the...
The assumption of additive white Gaussian noise (AWGN) to model measurement is not valid since many applications such as in RF power measurement the noise is colored with 1/f spectrum characteristics. With this characteristics, the assumption of independently identically distribution (IID) used in signal detection and estimation becomes not valid. The autocorrelation function and power spectrum can...
Stochastic techniques have been widely employed to improve the quality of noisy images. This research paper analyzes the dispersion parameter of the Fokker Plank equation (Kolmogorov Forward equation), which forms the bases to build a transition probability matrix. The empirical results depict that besides being dependent on an image this parameter also depends on the type of noise. Processing time...
This paper analyses the effect of noisy near-field amplitude data on the phase retrieval algorithm. Additive white Gaussian noise is applied on the signal. Signal-to-noise ratios between 3 dB and 60 dB are considered. It'll be shown that using the Iterative Fourier Transform the far-field data can be obtained even under low signal-to-noise ratio.
Recording the electrical current of the cortex is called electroencephalography (EEG). EEG signals can be affected by high and low frequency noises which are caused due to muscular activity (EMG), Power line interference, eye blinks and etc. In this paper, we introduce an adaptive wavelet method for elimination of high frequency noises from EEG. The desired noise is extracted from the raw signal by...
Own method of embedding information in still pictures was synthesized. New algorithm used additional blocks of cropping and stability under the previous image processing. This ensured the reliability of the system and increased the probability of correct recognition of embedded data. The complex analysis of the most relevant data hiding methods by multiobjective optimization was done. Also the comparative...
Information fetal development in the womb can be seen through a scanning process with ultrasonography technology. The resulting image of the process of two-dimensional ultrasonography has not been able to provide complete information. This paper describes several necessary processes to make the image of the ultrasonography can be identified precisely and accurately to provide information needed by...
Developing a precise understanding of the dynamic behavior of time series is crucial for the success of forecasting techniques. We introduce a novel communication-theoretic framework for modeling and forecasting time series. In particular, the observed time series is modeled as the output of a noisy communication system with the input as the future values of time series. We use a data-driven probabilistic...
Usually, imaging and measurement using ultrasound employs the application of single pulse signals for probing. Despite low correlation sidelobes and wide bandwidth which contribute to the good temporal resolution such single pulses have low energy. If material attenuation and scattering are high, or application is air-coupled, signal losses are high and signal-to-noise ratio is low. Spread spectrum...
Giant Ukrainian Radio Telescope (GURT) is a low-frequency one with active phased antenna array, which is being built in Ukraine in addition to the existing UTR-2 radio telescope. In this paper we consider the signal-to-noise ratio in active antenna, which is used as an element of GURT radio telescope antenna array. The sensitivity of the element mainly determines the sensitivity of not only the entire...
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