The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
To characterize statistical moments of cell delays and slopes, the standard method is Monte Carlo (MC) method. However, this method suffers from very high computational cost. In this paper, we propose a technique to quickly and accurately estimate Standard Deviation (SD) of standard cell delays and slopes. The proposed technique is based on the identification, performed with a reduced set of MC simulations,...
The conduction delay in neural systems has been proven to play an important role in processing neural information. In hardware spiking neural networks (SNN), emulating conduction delays consists of intercepting and buffering spikes for a certain amount of time during their transfer. The complexity of the conduction delay implementation increases with high spiking rates; it implies (1) storing a large...
We present a digital phase interpolator (PI) design for 65nm CMOS that avoids conventional analog structures, accurately achieves 2-bits phase resolution across a range of rise time and input delays from trise: 48ps → 200ps using a ratio trise/tdelay of at least 1 or greater. Increased accuracy is available for certain rise times using ratios increasing between 1 and 10 as verified by simulations...
In this paper, a ternary stimulus is proposed for testing SD Analog-to-Digital Converters (ADCs). The ternary stimulus is composed of three logic levels {-1,0,1} and is obtained by adding a binary stream with a delayed version of itself. Only four switches are added to the input stage of the modulator of the ADC for facilitating the injection of the ternary stimulus. Compared...
Conventional adaptive notch filter based on an infinite impulse response (IIR) filter is well known. However, the IIR adaptive notch filter has a problem of stability due to an IIR filter and bias error due to disturbance. The adaptive notch filter using Fourier sine series (ANFF) is therefore proposed as a stable adaptive notch filter with bias free adaptive algorithm. However, there are problems...
Today's competitive business climate and the complexity of IT environments dictate efficient and cost effective service delivery and support of IT services. This is largely achieved through automating of routine maintenance procedures including problem detection, determination and resolution. System monitoring provides effective and reliable means for problem detection. Coupled with automated ticket...
In this paper, we present a Mixed Integer Programming formulation for the sample day selection problem. This formulation incorporates the IMC delay minutes for the purpose of modeling the effect of weather conditions in its objective function along with other performance metrics. The objective of the MIP formulation is to minimize the sum of differences between the sample averages and the full population...
Measuring and predicting users quality of experience (QoE) in dynamic network conditions is a challenging task. This paper presents results related to a decision-theoretic methodology incorporating Bayesian networks (BNs) and utility theory for quality of experience (QoE) measurement and prediction in mobile computing scenarios. In particular, we show how both generative and discriminative BNs can...
Pulsed-RF (aka. Ultrawideband, or UWB) signaling strategies inherently produce separation of multipath reflections from the earliest Line-of-Sight (LOS) signal. Direct waveform scanning in each UWB transceiver allows coarse estimation of distance through relative signal strength measure of the earliest, most direct path pulse. Even with multipath separation this technique suffers from errors due to...
This paper presents a Built-In Self-Test (BIST) scheme to measure high speed double data rate (DDR) memory output timing using low cost testers. This technique uses an on-chip pattern generator to generate a time delay between data and data-strobe or clock. The time delay is controlled precisely using a phase interpolator based cycle-by-cycle control method. A novel method for testing the resolution...
Performing activity recognition using the information provided by the different sensors embedded in a smartphone face limitations due to the capabilities of those devices when the computations are carried out in the terminal. In this work a fuzzy inference module is implemented in order to decide which classifier is the most appropriate to be used at a specific moment regarding the application requirements...
Failure in the network devices can be identified by detecting changes in the behaviour of the network. Such a network can be part of the communication infrastructure, which will play a significant role in the emergency managements. Network power consumption behaviour, namely its power profile, is a relatively robust profile such that from changes in that profile failure of the links or/and the nodes...
Quality-of-information (QoI) in sensor networks measures attributes such as accuracy, timeliness, completeness and usefulness of data ultimately delivered to users. It is a challenge to provide the required QoI in mobile sensor networks given the large scale and complexity of the networks with heterogeneous mobile and sensing devices. In this paper, we provide a comprehensive study on major QoI metrics...
Delay mismatch between the input and output signals of power amplifiers (PAs) may lead to an erroneous assumption of memory effects. In adaptive digital predistortion (DPD) system, the delay mismatch affects the accuracy of coefficients estimation and degrades performance of the DPD system. In this paper, we reveal the impact of fractional delay mismatch, and analyze the relationship between delay...
In this paper, we propose an algorithm for timing synchronization that attains fundamental bounds derived by Weiss and Weinstein. These bounds state that, in addition to improving with time-bandwidth product and signal-to-noise ratio (SNR), timing accuracy also improves as the carrier frequency gets larger, if the SNR is above a threshold. Our algorithm essentially follows the logic of the Weiss-Weinstein...
This paper studies the correlogram spectrum estimation method for the case that only a subset of the Nyquist samples is available. The method is able to estimate the spectrum from undersampled data. The bias and variance of the estimator are derived. We also show that there is a tradeoff between the accuracy of the estimation and the frequency resolution. The asymptotic behavior of the estimator is...
Long-haul sensor networks are deployed in a wide range of applications from national security to environmental monitoring. We consider target tracking over a long-haul sensor network, wherein state and covariance estimates are sent from sensors to a fusion center that generates a fused state. Fusion serves as a viable means to improve the estimation performance to meet the system requirement on accuracy...
Intrusion Detection Systems (IDS) have become ubiquitous in the defense against virus outbreaks, malicious exploits of OS vulnerabilities, and botnet proliferation. As attackers frequently rely on host scanning for reconnaissance leading to penetration, IDS is often tasked with detecting scans and preventing them. However, it is currently unknown how likely an IDS is to detect a given Internet-wide...
Recently, several researches consider how to improve estimation accuracy in a time difference of arrival (TDOA) localization system using UWB in a non-line-of-sight (NLOS) environment for medical network. This method consists of step-by-step compensation on the basis of two approaches considering a reference position that is estimated from data affected by NLOS delay. The first consideration consists...
Discrete Gate Sizing is a commonly used technique for power and/or timing optimization. The accuracy of delay and power models play an important role during the optimization process, since circuit delay and power must be estimated in each gate change step to check its feasibility. Although accurate delay and power models are desirable to achieve good optimization results, they are non-convex and that...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.