Air-writing systems have recently been proposed as tools for human-machine interaction where instructions can be represented using letters or digits written in the air. Different technologies used to realize air-writing systems. In this article, we propose an system acoustic waves. The consists of two components: a motion-tracking component and text recognition component. For motion tracking, utilize direction-of-arrival (DOA) information. An ultrasonic receiver array tracks wearable...

The propagation of ultrawideband (UWB) signals in indoor environments is an important issue with significant impacts on the future direction and scope UWB technology. governed, among other things, by properties materials medium. information electromagnetic construction frequency range would provide valuable insights into appreciation capabilities limitations Although certain over relatively narrow bandwidths GHz ranges are available, characterisation most typical for communication purposes...

In computational material design, ionic radius is one of the most important physical parameters used to predict properties. Motivated by progress in materials science and informatics, we extend renowned Shannon's table from 475 ions 987 ions. Accordingly, a rigorous Machine Learning (ML) approach employed radii using all possible combinations Oxidation States (OS) Coordination Numbers (CN) available crystallographic repositories. An ionic-radius regression model for database developed as...

Unmanned air vehicle (UAV) as an aerial base station (ABS) has attracted the attention of cellular service providers to enable emergency communications. However, unplanned multiple ABS deployment poses severe interference challenges that degrade user's performance. To maximize system sum capacity, we propose use <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</i> -means and xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -learning assisted...

Visible light communications (VLC) based indoor positioning is a promising approach to serve an increasing need for location-aware services. Received signal strength (RSS) fingerprints visible (VLP) was shown achieve highly accurate, yet simple, VLP systems. It needs, however, large training datasets; whose collection labor intensive. In this work, artificial dataset generation methodology on modified pathloss model proposed, where the exponent assumed be variable. Four interpolation...

A widely used method for noncontact electromagnetic characterization of materials is based on the measurement an insertion transfer function. This function, defined as ratio two phasor signals measured in presence and absence material under test, related to dielectric constant through a complex transcendental equation. Solving this equation requires numerical two-dimensional root search technique, which often time consuming due slow convergence existence spurious solutions. In paper, new...

The propagation of ultra wideband (UWB) signals in indoor environments is an important issue with significant impacts on the future direction and scope UWB technology its applications. objective this work to obtain a better assessment potentials communications by characterizing communication channels. Channel characterization refers extracting channel parameters from measured data. An measurement campaign undertaken. Time-domain measurements using pulses less than 100 ps width are carried...

Driven by technological breakthroughs, indoor tracking and localization have gained importance in various applications including the Internet of Things (IoT), robotics, unmanned aerial vehicles (UAVs). To tackle some challenges associated with tracking, this study explores potential benefits incorporating SO(3) manifold structure rotation matrix. The goal is to enhance 3D performance extended Kalman filter (EKF) unscented (UKF) a moving target within an environment. Our results demonstrate...

One of the most challenging problems in condensed matter physics is to predict crystal structure just from chemical formula material. In this work, we present a robust machine learning (ML) predictor for point group ternary materials (A[Formula: see text]B[Formula: text]C[Formula: text]) - as first step with very small set ionic and positional fundamental features. From ML perspective, problem strenuous due multi-labelity, multi-class, data imbalance. The resulted prediction reliable high...

In through-the-wall radar imaging, multipath propagation can create ghost targets which adversely affect the image reconstruction process. The fact that positions changes with locations is referred to as aspect dependence has been reported among features distinguishing from true target. This paper proposes suppression method exploit feature under compressive sensing framework. existing signal model modified so location of reflecting geometry no longer a constraint. Also matrix greatly...

Non-orthogonal unmanned aerial vehicle (UAV)-aided secure downlink transmissions are investigated. A single-antenna UAV serves multiple ground users in the face of colluding eavesdroppers (EVs) and only imperfect location information EVs is available. Specially, a power splitting based non-orthogonal transmission scheme considered, where transmit divided into two parts for transmitting confidential artificial noise. Explicitly, we maximize minimum average secrecy rate among all by optimizing...

Sensor array configurations such as coprime and nested arrays have attracted many researchers because they increase the degree of freedom (DOF). For example, in direction arrival estimation, number sources that can be estimated is greater than total sensors. This study proposes a multi-level prime (MLPA) configuration for sparse sampling further DOF. The proposed uses multiple uniform linear subarrays where sensors pairwise integers. inter-element spacing between formulated scaled...

Seismic surveys are conducted by oil exploration companies to keep up with the global demand for and gas. Although seismic cables offer fast reliable data transfer, they account a majority of equipment weight, logistics, labor costs. A novel wireless geophone network architecture, compliant IEEE 802.11af standard, is described. Operation in television white spaces can achieve long transmission ranges, allowing scalable coverage large survey areas. Two methods collection proposed:...

UWB Channels can be measured by sounding the channel with pulses, and thereby obtain impulse response. Multipath components have different waveforms depending on type of transmitter receiver antennas used angles transmission reception. A modified deconvolution technique is introduced to extract The application techniques results in resolving multipath from that pulse. Resolving more should improve design rake receiver. Accurate characterization for response a communication system facilitates...

The information on electromagnetic properties of building materials in the ultra wideband (UWB) frequency range provides valuable insights assessing capabilities and limitations UWB technology. This research examines propagation through typical construction their characterization. Ten commonly used are chosen for this investigation. Results insertion loss dielectric constant each material over a 0.5 to 15 GHz presented.

The propagation of ultra-wideband (UWB) signals in indoor environments is an important issue with significant impacts on the future direction and scope UWB technology its applications. objective this article to present assessment potentials communications by characterizing channels. channel characterization refers extracting parameters from measured data. An measurement campaign undertaken. Time-domain measurements using pulses FWHM equal 85 ps are carried out. Typical scenarios, including...