In mobile-to-mobile (M2M) communication systems, both the transmitter and receiver are moving with a certain velocity, which is usually assumed to be constant over time. However, in realistic propagation scenarios, velocity of mobile stations (MSs) subject changes resulting non-stationary fading process. this paper, we develop narrow-band M2M multipath channel model, where experience their velocities trajectories. For derive expressions for local autocorrelation function (ACF), Wigner-Ville...

Underground mining is an industry that preserves the miners' safety and efficiency in their work using wireless communication systems as a tool. In addition to links characterized by radio frequency signals, optical visible light spectrum are under intense research for underground applications due high transmission rates immunity electromagnetic interference. However, design of robust visible-light (VLC) system challenging task harsh propagation conditions encountered tunnels. To assist...

Abstract Let φ: ℝ × M → be a continuous flow on compact C ∞ two-manifold . It is proved that there exists 1 ψ which topologically equivalent to φ, and the following conditions are equivalent: (a) any minimal set of φ trivial; (b) 2 flow; (c) flow. Also structure an existence theorem for flows with non-trivial recurrence.

In this paper, we present a novel geometry-based statistical model for small-scale non-wide-sense stationary uncorrelated scattering (non-WSSUS) mobile-to-mobile (M2M) Rayleigh fading channels. The proposed builds on the principles of plane wave propagation to capture temporal evolution delay and Doppler shift received multipath signal. This is different from existing non-WSSUS channel models, which are based spherical approach, that in spite being more realistic mathematically intricate. By...

Multiple input-multiple output (MIMO) is a key enabling technology for the next generation of wireless communication systems. However, one main challenges in implementation MIMO system complexity detectors when number antennas increases. This aspect will be crucial future massive A flexible design can offer convenient tradeoff between detection and bit error rate (BER). Deep learning (DL) has emerged as an efficient method solving optimization problems different areas. In systems, neural...

Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="script upper X Superscript r Baseline left-parenthesis M overTilde right-parenthesis comma greater-than-or-equal-to 1"> <mml:semantics> <mml:mrow> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mi class="MJX-tex-caligraphic" mathvariant="script">X</mml:mi> </mml:mrow> <mml:mi>r</mml:mi> </mml:msup> <mml:mo stretchy="false">(</mml:mo> <mml:mover> <mml:mi>M</mml:mi>...

Falling events are a global health concern with short- and long-term physical psychological implications, especially for the elderly population. This work aims to monitor human activity in an indoor environment recognize falling without requiring users carry device or sensor on their bodies. A sensing platform based transmission of continuous wave (CW) radio-frequency (RF) probe signal was developed using general-purpose equipment. The CW is similar pilot subcarriers transmitted by...

A new method to assess the quality of additive manufacturing (AM) metal powders using triboelectric charging concept is demonstrated CpTi, Ti6Al4V, AlSi10Mg, IN 738, and SS 316L powders. For each powder tested, surface chemical composition was first analyzed X-ray photoelectron spectroscopy (XPS) determine passivation layer. Some modifications current GranuCharge™ setup, developed by GranuTools™, were then performed incorporating a flow rate measuring tool how tribocharging affected as...

This paper presents a modified version of the method equal areas (MEA) for designing simulation models frequency non-selective mobile fading channels under non- isotropic scattering conditions. The proposed method, called MEA (MMEA), is well suited channel simulators based on finite sum complex sinusoids. combination MMEA with principle set partitioning also here as an efficient way to improve performance simulator and reduce computational costs. Such results in new parameter computation...

In this letter, we introduce the Riemann sum method (RSM) as an effective tool for design of sum-of-cisoids (SOC) simulators narrowband mobile Rayleigh fading channels under non-isotropic scattering conditions. We compare performance RSM with that generalized equal areas (GMEA) and L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> -norm (LPNM), which were until now only methods available SOC channels. The obtained results indicate is...

The fifth-generation (5G) of mobile communications networks is emerging as a revolutionary technology that will accelerate the development smart cities and realization information society. This paper aims to provide an introduction 5G for non-specialists, survey this new those already familiar with communications, covering conceptualization core technologies underpinning networks. also discusses status commercial roll-out until 2020 from worldwide perspective gives future view beyond 5G.

Abstract Let M be a compact manifold that contains two-dimensional punctured torus. Given p ∈ and an integer r ≥ 2, there exists X ∞ ( ) having non-trivial recurrent trajectories such that, for some neighbourhood of | −{ }) in }), no Y has closed orbits.

Analytical expressions of the statistical distribution underground mining visible light communication (UM-VLC) square-channel gain are derived considering scattering, shadowing, and a random position orientation receiver. These employed to compute system’s bit error probability (BEP) shot thermal noises, on–off keying modulation, as well perfect imperfect channel state information (CSI) at receiver side. The results obtained for BEP validated by computer simulations various UM-VLC scenarios....

Machine learning (ML) algorithms have been widely used to improve the performance of telecommunications systems, including reconfigurable intelligent surface (RIS)-assisted wireless communication systems. The RIS can be considered a key part backbone sixth-generation (6G) mainly due its electromagnetic properties for controlling propagation signals in channel. ML-optimized systems an effective alternative mitigate degradation suffered by signal channel, providing significant advantages...

In the last few years, field of Web services (WS) security has evolved rapidly producing an impressive number WS-based standards. This fact caused that organizations are still reticent about adopting technologies based on this paradigm due to learning curve necessary integrate into their practical deployments. paper, we present PWSSec (process for security) as a process enables integration set specific stages traditional phases systems development providing them with security. is composed...

This paper is concerned with the consistency of non-stationary multipath fading channels. We introduce conditions under which a channel model consistent w.r.t. average Doppler shift and spread. The are applied to two classes models. first class, termed Class A, characterized by models based on an integral relationship between path phases associated time-variant frequencies. second class models, called B emerges from standard sum-of-cisoids (SOC) replacing time-independent frequencies...