Optical wireless technology uses light for mobile communications. The idea is to simultaneously combine the illumination provided by modern high-power light-emitting diodes (LEDs) with high-speed There have been numerous practical demonstrations of this concept, and now well matured be deployed in practice. Independent market analysts forecast a high-volume communication devices connected ubiquitous lighting infrastructure. This paper aims make optical industries aware requirement...

Vehicle-to-vehicle (V2V) communications are one of the most promising 6G scenarios. However, V2V demand high data rates and extremely low-latency requirements that difficult to satisfy nowadays. Recently, vehicular visible light (V-VLC) have been proposed as a technology guarantee such requirements. Multiple-input, multiple-output (MIMO) techniques can potentially achieve rates. when applied V-VLC, they confront challenges latency because need for closed-loop transmission or correlation...

Passive radar has become very popular in recent years because it is usually undetectable, and countermeasures used to prevent its functioning are complex and, general, easily identified. Terrestrial digital video broadcasting (DVB-T) commonly as an opportunistic illumination signal of large range widespread deployment, both which make applicable almost all scenarios. This paper presents the design a compact robust receiver for passive that uses low number antenna while achieving high...

An efficient implementation of several tasks at the receiver becomes crucial in OFDM-based high-speed WLAN systems, such as automatic gain control, time and frequency synchronization, offset tracking. This paper deals with fixed point constraints accuracy requirements for those algorithms. Also, a complete set thresholds practical synchronization sub-blocks is obtained. Moreover, technique to mitigate remaining after coarse acquisition proposed, yielding good trade-off between performance...

In this paper, a novel cooperative transmission and reception scheme in Visible Light Communications (VLC) is proposed evaluated.This new provides improvements reliability large indoor scenarios, such as corridors, laboratories, shops or conference rooms, where the coverage needs to be obtained by using different access points when VLC used.The main idea behind proposal simple receiver terminal will obtain signal from at same time.This outperforms traditional schemes, especially...

Visible light communications (VLC) have received significant attention as a way of moving part the saturated indoor wireless traffic to wide and unregulated visible optical spectrum. Nowadays, VLC are considered suitable technology, for several applications such high-rate data transmission, supporting internet things or positioning. The signal processing originally derived from radio-frequency (RF) systems cooperative precoding schemes can be applied VLC. However, its implementation is not...

Fixed Satellite Services (FSS) used to be alone at the C-Band spectrum in most countries. Since deployment of 5G many countries (i.e., 3.3–3.6 GHz), FSS is not exclusive system anymore. In order minimize detrimental interference for allowable levels, regional exclusion zones maximum radiated power base stations (BS) are proposed and evaluated. this paper, a measurement campaign has been carried out, an analysis studied. A filtering model, namely Filter Remove Broadband Interference...

In this paper, a novel High Power Amplifier (HPA) pre-distorter based on Adaptive Networks - Fuzzy Inference Systems (ANFIS) for Orthogonal Frequency Division Multiplexing (OFDM) signals is proposed and analyzed. Models of Traveling Wave Tube Amplifiers (TWTA) Solid State (SSPA), both memoryless with memory, have been used evaluation the technique. After training, ANFIS linearizes HPA response thus, obtained signal extremely similar to original. An average Error Vector Magnitude (EVM) 10...

In this paper, we investigate a novel channel estimation (CE) method for multiple-input and single-output (MISO) systems in visible light communication (VLC). Direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) is commonly used VLC where half of the available subcarriers are spent to guarantee real-valued output after inverse fast Fourier transform operation. Besides, dedicated typically CE, thus, many resources wasted spectral efficiency degraded. We propose...

Visible light communication (VLC) is a promising ubiquitous design alternative for supporting high data rates. Its application has been primarily oriented to indoor scenarios, but the proliferation of light-emitting diodes in streets warrants its investigation outdoor scenarios as well. This paper studies feasibility VLC conventional scenario, when optical orthogonal frequency division multiplexing techniques are employed. The presence sunlight reduces system's performance, hence...

One of the main drawbacks Orthogonal Frequency Division Multiplexing (OFDM) are large fluctuations its power envelope. In this letter, a novel and efficient scheme based on Multilayer Perceptron (MLP) Neural Networks (NN) is proposed. The NN synthesizes Active Constellation Expansion - (ACE) technique which able to drastically reduce envelope fluctuations. This achieved with much lower complexity, faster convergence, better performance compared previously available methods.

Promising technologies are being investigated to integrate them into the fifth generation (5G) and beyond mobile network systems. The main goal of these is evolve cellular networks that will significantly stress forward limit legacy systems through all dimensions performance metrics. Some most potential key enabler millimeter waves (mmWave), massive multiple-input multiple-output (MIMO) small cells (SC) These sets dramatically increase throughput, enhance spectral energy efficiency, capacity...

Visible light communication (VLC) is a promising technology to achieve high data rates in heterogeneous scenarios. However, VLC strongly depends on the existence of line-of-sight (LoS) link between transmitter and receiver guarantee good rate performance, which often condition that difficult satisfy practice. In this letter, novel cooperative multicarrier transmission scheme proposed, where neighboring attocells smartly cooperate decrease probability blockage LoS link. This approach compared...

Visible light communication (VLC) often suffers from line-of-sight path blockages and high levels of inter-cell interference. Thus, the analysis design cooperation techniques become crucial to address these key impairments. This paper studies performance different resource allocation schemes that are suitable for multi-cell cooperative transmission when tri- tetra-chromatic light-emitting diodes (LEDs) optical orthogonal frequency-division multiple access utilized. Firstly, guidelines...

In this paper, a novel scheme for reducing the envelope fluctuations in multi-carrier signals applying Adaptive Neural Fuzzy Inference Systems (ANFIS) is proposed and analyzed. Once trained with very low fluctuations, such as those obtained by Active Constellation Expansion - Approximate Gradient Project (ACE-AGP) algorithm, ANFIS approximately reaches similar reduction ACE-AGP without complexity large convergence time of conventional ACE-AGP. We show that our approach less complex than...

Mobile communications are today widespread and contribute to the development of our society. Every day new devices include some means wireless transmission, which is becoming ubiquitous with Internet Things. These systems standardized by international organizations such as IEEE, 3GPP, ETSI, among others. Even though knowledge standards key understanding these systems, quite often taught in engineering degrees a traditional way, without much emphasis on standardization. Moreover, strong focus...

In this paper, we propose Li-Tect, an algorithm to detect the shape of object located in indoor environment using low cost optical elements through sensing environment's light. The analyzes, relying on predictability propagation paths, how much light is expected propagate absence obstructions caused by presence object. Then, based received when room, infers addition, considers reflected paths from surfaces order determine object's estimated shape. We study five different scenarios...

In this letter, the multiuser bit and power allocation problem for an orthogonal frequency division multiplexing (OFDM)/offset-quadrature amplitude modulation (OQAM) system is investigated. The signal-to-interference-plus-noise ratio (SINR) required expressions formulation of in OFDM/OQAM are developed. Next, a suboptimal algorithm based on proposed.

Fifth-generation (5G) networks have been deployed alongside fourth-generation in high-traffic areas. The most recent 5G mobile communication access technology includes mmWave and sub-6 GHz C-bands. However, signals possibly interfere with existing radio systems because they are using adjacent co-channel frequencies. Therefore, the minimisation of interference other already for services, such as fixed-satellite service Earth stations (FSS-Ess), is urgently needed. novelty this paper that it...

Visible light communication (VLC) is a technology that complements radio frequency (RF) to fulfill the ever-increasing demand for wireless data traffic. The ubiquity of light-emitting diodes (LEDs), exploited as transmitters, increases VLC market penetration and positions it one most promising technologies alleviate spectrum scarcity RF. However, deployment hindered by blockage causing connectivity outages in presence obstacles. Recently, optical reconfigurable intelligent surfaces (ORISs)...

This study evaluates the maximum theoretical exposure to radiofrequency (RF) electromagnetic fields (EMFs) from a Fifth-generation (5G) New Radio (NR) base station (BS) while using four commonly used mobile applications: YouTube for video streaming, WhatsApp voice calls, Instagram posting pictures and videos, running Video game.Three factors that might affect exposure, i.e., distance of measurement positions BS, time, induced traffic, were examined.Exposure was assessed through both...

Frequently, Wireless Sensor Networks (WSN) are designed focusing on applications and omitting transmission problems in these wireless networks. In this paper, we present a measurement campaign that has been carried out using one of the most commonly used WSN platforms, micaZ from Crossbow(©). Based measurements, some guidelines to deploy robust reliable provided. The results focused security environmental but can also be extrapolated other scenarios. A main conclusion extracted is that,...