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We report an investigation on the statistics of group delay for few-mode fibres operating in the weak and strong linear coupling regimes as well as in the intermediate coupling regime. A single expression linking the standard deviation of the group delay spread to the fibre linear mode coupling is validated for any coupling regime, considering up to six linearly polarized guided modes. Furthermore,...
The reachable set estimation problem of discrete-time Markovian jump systems with time-varying delay is concerned with in this note. By utilizing Lyapunov theory and reciprocally convex combination approach, a sufficient reachable set estimation condition is proposed in terms of linear matrix inequalities (LMIs). A numerical example is provided to demonstrate the workability of the proposed results.
Clock skew measurement can be realized in one-way communication by continuously collecting timestamps from the same remote device, and then find the slope of best fit to the offset dataset. However, offsets collected in mobile network may form multi-segmented distribution due to the change of base station or network adapter. This type of distribution usually cause the existing methods fail to provide...
This note is concerned with the linear estimation problems for discrete-time systems where the measurements are subject to random time delay and packet drop. Due to the time stamping being assumed to be unavailable in this paper, the estimation problems for such systems are very difficult because the information of the received measurements is not exactly known in most cases. To overcome the difficulty...
This paper is to develop a new distributed estimation technique for linear systems with network induced delays and packet dropouts. A set of random variables are utilized to model the random delay phenomena occurring in the channels from the system to the sensors. And the consensus weights are assumed to be known. A distributed sub-optimal filter is presented by minimizing an upper bound on a quadratic...
Weighted MUSIC algorithm based on delay correlation is proposed because of the problem that MUSIC algorithm has low DOA estimation performance in actual system. The proposed algorithm makes full use of delay correlation information of impinging signals to improve estimation performance. We obtain a new receiving data matrix which has the same array manifold with original data by observing association...
The Time Difference of Arrival (TDOA) of an acoustic source with respect to a given pair of microphones is typically estimated as the maximizer of a Measure of Synchrony (MoS) between the pair of microphone signals, within the interval [−D/v, D/v], where D is the inter-microphone distance and v is the speed of sound. In practical enclosures, phantom sources are created due to reverberation, which...
This paper proposes a novel method for estimation of strength of excitation (SoE) from speech signal. Using lowpass filtering to remove the effect of relatively high frequency vocal tract characteristics, we estimate epoch locations. Using these epoch locations we estimate SoE. The database used for evaluation purpose is CMU-ARCTIC database consisting of electroglottograph (EGG) signals. In addition,...
Channel estimation for an orthogonal frequency-division multiplexing (OFDM) broadband system over a dynamic sparse channel has become a challenging problem. Due to the special feature of dynamic sparse channels: path delays change over time, the channel sparsity changes dynamically. We propose a differential simultaneous orthogonal matching pursuit (DSOMP) algorithm based joint multi-symbol channel...
The method of detection and identification of a low Doppler target under conditions of intensive disturbances having fluctuating character is investigated in this article. The proposed algorithm for calculating the estimations of the target spatial position and the Doppler frequency translation of a signal reflected from the target is an optimum from the standpoint of the maximum of likelihood. The...
Direction of Arrival (DOA) estimation technique has been lately used to determine the location of mobile devices. Using array antennas with the help of signal processing makes it possible to effectively identify the location or direction of the user. Some well-known DOA estimation algorithms have been proposed such as delay and sum method, Capon's minimum variance method, subspace method with MUSIC...
Finding out remained time to voltage instability occurrence is necessary to make a timely decision on corrective actions. This paper presents a novel method for discovering time to long term voltage instability. The method is based on virtually acceleration of OLTCs' operation during time domain simulation in order to realizing detection of long voltage instability and predicting time to the voltage...
We shed new light on the mechanism behind how the dynamic behavior of a packet scheduler at the link layer in mobile networks degrades the accuracy of conventional available bandwidth (i.e., unused capacity of an end-to-end path) estimation methods that use a probing packet train (i.e., a set of multiple probing packets). Most of the conventional methods, which were originally designed for wired networks,...
When the femtocell base station has perfect channel state information, it can adopt beamforming to avoid interference. However, the perfect channel assumption may not be practicable due to the channel-state information delay, channel estimator error, and bandwidth wastage while reporting channel parameters. In this paper, we proposed an angle of arrival (AOA) based beamforming structure for orthogonal...
Massive access of Machine to Machine (M2M) devices may lead to overload at the access of the LTE networks as the current most popular technology for this type of communications. Several approaches have been proposed to relieve the massive access by time barring or time distributing of access requesting. In virtual-frame technique the requests are spread in consecutive frames to increase the successful...
A composite structure for joint amplitude and time delay estimation of a delayed sinusoidal signal is proposed in this paper. The proposed method composed of a digital all-pass lattice structure and a gradient adaptive structure. The lattice structure receives the reference sinusoidal signal and provides the desirable regressor signals for the adaptive structure. Also, this structure is furnished...
Named Data Networking (NDN) is an Information-Centric Networking architecture that has recently attracted significant attention. NDN rethinks the Internet communication paradigm around the name of the data instead of its location. In Content-Oriented architectures, in-network caching enables data retrieval from different network nodes and may result in frequent data sources changes and wide RTT fluctuations...
This paper addresses estimation of decoupling capacitance (decap) at sub-module stage based on their power dissipation and proper allocation of decap at the pre-layout level. Decap being in between power and ground distribution networks acts as local charge storage and effectively reduces rapid transients in the supply drop. Therefore, present trends in VLSI design are inclined towards the placement...
Power has becomes one of the crucial parameter while designing a SOC ICs. Power analysis of a circuit is important for reliability check, better design of power distribution network, packaging decisions and to solve power issues during test. High switching at a time demands high instantaneous current from power supply network. Which gates experience Vdd drop leading to increase in delay of the circuit...
Truck Factor (TF) is a metric proposed by the agile community as a tool to identify concentration of knowledge in software development environments. It states the minimal number of developers that have to be hit by a truck (or quit) before a project is incapacitated. In other words, TF helps to measure how prepared is a project to deal with developer turnover. Despite its clear relevance, few studies...
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