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In this paper, we introduce the multi-drone platform which is realized by swarm algorithm. One of the most challenging problems when maneuvering multiple drones is guaranteeing collision avoidance. Since our swarm algorithm is based on the artificial potential function(APF), collision avoidance between quadrotors is guaranteed. First, the constructive way to generate swarm controller will be given...
We study the secrecy capacity of the multiple- input single-output (MISO) Gaussian wiretap visible light communication (VLC) channel. We study a typical VLC scenario with one transmitter, one legitimate receiver, and one eavesdropper. Specifically, we compute the achievable secrecy rate for various input signaling distributions, including the truncated generalized normal (TGN) and uniform distributions...
We focus on the road-to-vehicle visible light communication (VLC) that system is composed of a LED matrix as a transmitter and a high-speed camera as a receiver. In this VLC system, intensity of each LED cannot be determined from received image directly in case that the receiver is distant from the transmitter. In previous research, a method to estimate intensity of the LED from received image is...
We introduce new insights into the network centrality based not only on the network topology but also on the network dynamics. The focus of this paper is on the class of uncertain linear consensus networks in continuous time, where the network uncertainty is modeled by structured additive Gaussian white noise input on the update dynamics of each agent. The performance of the network is measured by...
This study investigates a model based on thermodynamic concept to improve the performance of the power block of the concentrated solar power (CSP) systems. The analytical solution of this model established by Aspen HYSYS, Engineering Equation Solver (EES) software programs and Matlab software programming system (Code and Simulink package) to study its performance. The model consists of normal combined...
The shade effect of a rooftop photovoltaic (PV) collector on a roof is usually ignored in building energy simulation in Transient System Simulation (TRNSYS) software. This disregard is due to either the unavailability of a suitable shading component in the simulation software or to an assumption that the shade on opaque surfaces, such as roofs, has small impact on the indoor temperature and the subsequent...
In this work, we deal with the problem of the Azimuth-Elevation (AE) blind tracking for the heliostats in solar central tower. The variation of the AE heliostat angular positions is supposed to happen in well-defined steps of time. It is the time necessary for updating the heliostat position where the mirror is kept properly aligned to the receiver situated on the top of the tower. We noted it here...
This paper study the principle of lightning location systems of how the multi-station techniques can be used to locate the sources of VHF radio emissions from lightning phenomenon. The lightning sensor used to measure electromagnetic field comprise of the magnetic direction finding (MDF) systems, time of arrival (TOA) systems and interferometry systems. These detection systems can point the place...
In this work, we consider a duty-cycled wireless sensor network with the assumption that the on/off schedules are uncoordinated. In such networks, as all nodes may not be awake during the transmission of time synchronization messages, nodes will require to re-transmit the synchronization messages. Ideally a node should re-transmit for the maximum sleep duration to ensure that all nodes are synchronized...
Compute-and-Forward relaying schemes exploit the additive nature of the wireless channel for decoding linear equations/combinations of transmitted messages. However, decoding equations that maximize the computation rate at each relay is in general not optimal from the network perspective. In fact, the (destination) receiver may fail to recover the individual messages even when the relays have successfully...
In the TDOA location of multi-Radar System, steepest descent method which is the commonly method has small amount of calculation while it's jagged, slow convergence, and the step size is difficult to choose. Although the genetic algorithm could accurately solve the global optimal solution, but the speed of convergence could slow down with the iterative process. The article proposed the TDOA location...
Selection of appropriate detection threshold (λ) is a very critical task in energy detection scheme based cognitive radio (CR) system. λ is mainly selected by using two principles called as constant detection rate (CDR) in which λ is calculated by taking fixed value of probability of detection (Pd) and constant false alarm rate (CFAR) in which λ is calculated by taking fixed value of probability of...
Suppose that one receives the superposition of r signals and each of them passes through an unknown channel, can we correctly recover the signals and their corresponding channels simultaneously from only one received signal? This problem, which intertwines blind deconvolution with blind demixing, appears in many fields of science and engineering such as wireless communication, imaging sciences, audio...
Orthogonal Frequency Division Multiplexing (OFDM) technique is widely used due to its high spectrum efficiency. It is used as physical layer standard in 802.11a WLAN standard & Digital Video Broadcasting-Terrestrial (DVB-t). The Fourth generation wireless communication standards are based of OFDM. Traditionally, Fast Fourier Transforms (FFT) has been used to produce the orthogonal sub-carriers...
This paper presents a full approach to outcomes due to the measurement of distance between two points in space, taking as reference XBee signal's (radio waves) attenuation as they travel from point A to B. XBee modules are able to communicate with each other, creating networks which consist of a coordinator, routers and end devices; allowing information flow across the network members. As bits voyage,...
In this paper, we tackle the direct and inverse problems for the Remote-Field Eddy-Current (RFEC) technology. The direct problem is the sensor model, where given the geometry the measurements are obtained. Conversely, the inverse problem is where the geometry needs to be estimated given the field measurements. These problems are particularly important in the field of Non-Destructive Testing (NDT)...
Received Signal Strength (RSS) localization has the attraction of requiring only simple receiver hardware. The basic idea is to find the position estimate that is most consistent with the received signal power measurements observed at multiple known locations in the area of interest. A fundamental assumption is that the signal power measurement is proportional to the product of the reference emitter...
Bluetooth Low Energy (BLE) enabled iBeacon is a low-power device and is suitable for many proximity and location-based applications. Micro-localization refers to the phenomena of tracking a target with high accuracy, which is an integral part of location-aware applications, both indoor and outdoor. Although many approaches towards localization have already been proposed in many research works, Received...
For the spectrum efficiency improvement of 5G mobile communication, a new waveform based on multi-carrier are important. In this paper, we like to suggest a W-OFDM(weighted orthogonal frequency division multiplex) system design and compare the nonlinear system performance with the already existing OFDM, UFMC(universal filtered multicarrier), FBMC(filter bank multicarrier) systems. At first, we describe...
In source localization system, micro and nano satellites are often used as distributed network to complete the task. This paper proposed a rotating triangular tethered satellite formation which has fewer station maintenance costs and superior reliability to maintain the geometry. Likewise, it can achieve high-resolution localization accuracy with short baseline resulted from rotating itself. In this...
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