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Cognitive Radio (CR) Technology has emerged for the future of wireless communications, its key parameters of interest are frequency, power and modulation techniques. The Spectrum Sensing is an important task to determine the availability of the vacant channels. In Multicarrier Communication using Digital Signal Processing Techniques, Filter Bank Multi Carrier (FBMC) has an edge over other technologies...
The aim of this work is to design the cell string layout in stationary concentrating photovoltaic (PV) or hybrid systems (PVT) in order to minimize the effects of both the longitudinal and transversal shading inherent to concentrating collectors. In this paper it is determined the best configuration of a PV string of cells, composed by several modules, by using a simple mathematical model based on...
In this paper, the clipping noise estimation problem based on compressed sensing (CS) is investigated when the subcarriers used for creating measurement vector are on the edge of the frequency band. Although selection of such subcarriers would not degrade data rate and is suitable for systems requiring high rates, it still weakens the performance of CS recovery algorithms especially in the presence...
Noise like yet deterministic behavior of chaotic systems has led the researchers to show a great interest in developing secure communication schemes based on chaotic systems. In the field of secure communication, hyperchotic systems are preferred to traditional chaotic systems because they have more complicated dynamical behavior. More recently, the focus has been on developing hyperchaotic systems...
Lane-level localization is the basis for successful deployment of Intelligent Transportation Systems. Global Navigation Satellite System can provide lane-level position in open (non-obstructed) environments. A new area of research aims for a collaborative approach to localization where one vehicle can leverage the localization information from other vehicles. A Dedicated Short Range Communication...
Timing-based indoor positioning requires synchronization of the anchors that are distributed in space. Many synchronization techniques have been proposed, but implementing them in practice is extremely challenging, especially for networks with a large number of anchors. In this paper, a new synchronization-free localization model for timing-based indoor positioning is proposed. This scheme employs...
The integrity of messages in vehicular ad-hoc networks has been extensively studied by the research community, resulting in the IEEE~1609.2 standard, which provides typical integrity guarantees. However, the correctness of message contents is still one of the main challenges of applying dependable and secure vehicular ad-hoc networks. One important use case is the validity of position information...
Wireless power transfer has been recognized as a promising technology for electric vehicles charging. However, the parking misalignments between the transmitter coil on the ground and the receiver coil inside the car may cause variations in the mutual inductance for the charging system, which will reduce its transfer power and efficiency. In order to improve the transfer efficiency and optimize the...
This work describes the characterization of a three coil system presenting strongly coupled magnetic resonance (SCMR) at low frequency. A theoretical model for the power transmission efficiency between coils is studied, in order to predict the system behaviour, for different positions of the auxiliary coil placed in the middle of the transmission. The best approach for determining each parameter that...
In this paper, the nonlinear perfect electric conductor (PEC) inverse scattering problem was addressed with a linear model. First, finite difference frequency domain (FDFD) was used to discretize the problem. Then, the contrast and the total field were included into the contrast source to formulate a linear model. Due to the fact that the induced current only exists on the surface of the PEC scatterers,...
In this paper, a single object tracking method based on fusion of detection information collected from a distributed heterogeneous sensor network is proposed. The considered sensor network is composed of one active type source and multiple receivers. It is assumed that the heterogeneous network is capable of acquiring both passive and active information simultaneously. By means of fusion of the acquired...
In this paper, the task of using the limited wireless resources to meet diverse applications of different qualities of service requirements is performed by presenting a method of improving the resource utilization based on the theory of discrete-time band-limited signal extrapolation. The feasibility of the proposed method is theoretically explained and effectively demonstrated by means of simulation...
The problem of Gaussian beam propagation is of significant interest for many physical disciplines, including optics, geophysics, and acoustics. Individual Gaussian beams are asymptotic solutions of Helmholtz's equation. Since they are insensitive to ray transition region, several techniques based on Gaussian beam are used to evaluate high frequency EM wave equation, which overcome partially or fully...
In recent years, waveform inversion is one of the hot methods because it can provide sub-wavelength images. In the inversion of field data, waveform inversion requires a good estimation of the source wavelet to reach the global convergence. Traditional method is that the source wavelet is added into the inversion as a new unknown parameter and updated with iterations. When the results of inversion...
In this paper we present the early development of a SAR simulator for ground-based fixed-receiver bistatic geometry. Firstly, we describe the assumptions the simulator is based on, then a short presentation of the mathematical model that lays behind the simulator is given. Furthermore, we give some details about its implementation and finally, we present some results.
In the application of GNSS-R technology, the reflection signal source is needed to test the receiver in order to reduce costs. The signal model is the core of GNSS-R signal source. In this paper, GPS reflection signal from sea surface is taken as the research object. Firstly, the appropriate signal phases are selected according to the correlation power distribution of the reflection signal in the...
This paper describes methods for velocity determination in high dynamic flight using a stand-alone single-frequency GPS receiver. The work is of interest, and the proposed scheme is valuable for practice. Simulations are developed with a GPS signal simulator and a GPS receiver,where the aircraft velocity is up to 7000 m/s, and the acceleration is up to 7 g (9.8m/s2). The performance of the receiver...
This paper presents the theoretical approach in developing the estimator equations for estimating distance and unknown channel parameters of indoor environment based on the received signal strength (RSS) method in Wireless Sensor Networks. The estimator equations are derived by manipulating the lognormal propagation model via maximum likelihood estimation method. In this paper, the path loss exponent...
Condition monitoring and condition-based maintenance can reduce maintenance costs and improve operation safety of vehicles across the full spectrum of transportation domain, including automotive, rail, air and marine applications. In this paper, a set-membership condition monitoring framework is proposed to detect aging and health degradation for dual fuel engines based on simultaneous input and parameter...
Previous channel measurement campaigns in millimetre wave bands were mostly focussing on time invariant channels of static environments. Highly directive antennas were swept in azimuth and elevation angle to extract the angular profile of the double-directional radio channel. This angular profile is also visual in the Doppler domain. Therefore, contrary to common Doppler modelling, close scattering...
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