Дисертації з теми "WI-FI module"

Обсяг звіту становить 68 сторінок, міститься 42 ілюстрації, 6таблиць, 0 додатків. Загалом опрацьовано 34 джерела. Впровадження роботехнічних комплексів в медичну практику і стимуляційних пристроїв визиває необхідність розробки пристроїв отримання керуючих сигналів. Один з таких пристроїв є електроміограф, якій дозволяє ефективно оцінювати та аналізувати рухи кінцівок. Для використання сигналу в якості керування, електроміограф повинен достатньо точно визначити зусилля м’яза і передати його у інформативному вигляді. Дана розробка призначена отримання пристрою здібного зареєструвати, перетворити у більш інформативну форму і передати сигнал іншому приладу. Мета ДР: Розробити і виготовити канал електроміографа з WI-FI модулем. Задачі ДП: – Розробити МТВ згідно чинних стандартів; – Розробити принципові схеми елементів каналу; – Спроектувати, виготовити та випробувати прототип
The volume of the report is 68 pages, contains 42 illustrations, 6 tables, 0 annexes. 34 references were used. The introduction of robotic systems in medical practice and stimulating devices necessitates the development of devices for receiving control signals. One such device is an electromyograph, which allows you to effectively assess and analyze the movements of the limbs. To use the signal as a control, the electromyograph must accurately determine the force of the muscle and transmit it in an informative way. This work is designed to solve this problem. Purpose: Develop and manufacture an electromyograph channel with a WI-FI module. Tasks: – Develop medical and technical requirements according to current standards; – Develop schematic diagrams of channel elements; – Design, fabricate and test a prototype

This work deals with the design and implementation of Wi-Fi LED lighting. It consists of various modules - switches, buttons, single or multicolored light sources - and a central unit that provides mutual communication and automation. The result of the work is the design of a prototype and several modules, which are built on the basis of the microcontroller ESP32. Their utility is implemented in C++. The user interacts through the website. The main result of this thesis is a demonstration of the possibility of using Wi-Fi to control light sources and creating complex lighting using a combination of simple modules and rules.

This master’s thesis deals with communication system design via the NFC and Wi-Fi interface. The thesis has two basic goals. The first goal is to create a device that is capable of storing of data and its subsequent transfer via the NFC interface. The second aim is to utilize this device for measuring various physical variables. The IoT technology is employed to fulfill the aforementioned goal. IoT technology is capable of visualizing data in real time and make them accessible via the Internet. The result of this work is an universal device, that contains the most popular communication interfaces, such as I2C, SPI and that is capable of processing measurement data from digital, analogue, and wireless sensors.

The diploma thesis gives the overall information about the field of wireless networks of standards 802.11 and Quality of Service (QoS). The practical measurements describe the reactions of multimedia dataflows in the networks 802.11a/b/g/n. The individual standards, offered services, access methods and the network architecture are analyzed in the theoretical part. In the following part there is written about QoS and its basic parameters. Moreover, the standard 802.11e and the question of QoS in the wireless networks are explained in a detailed way. The first part of the practical measurement is focused on the networks 802.11b/g/n. All main network statistics are measured when using the wireless stations and routers. The projection and implementation of the wireless network in the Opnet Modeler is included in the next part. The individual simulations WLAN in the Opnet Modeler are comparing the networks 802.11a/b/g. The analysis of the key QoS statistics is undertaken; the measured data are clearly displayed in the charts and schemes. The interpreted results are concluded and justified.

L'informatique géo-distribuée (Fog Computing) désigne la migration des ressources de calcul et de stockage du nuage (Cloud) vers les utilisateurs. Cette migration des ressources permet de réduire la latence des terminaux utilisateurs afin de répondre à l'évolution des usages de l'Internet. En parallèle, le nombre de terminaux ne cesse de croître avec le développement de l’Internet des objets. Cette croissance des infrastructures et du nombre d’objets connectés à Internet entraîne une hausse de la consommation électrique globale liée au numérique.Cependant, cette consommation est très distribuée et fait intervenir de multiples acteurs : objets connectés, réseaux locaux, fournisseurs d’accès à Internet, infrastructures de Fog et de Cloud. Il est ainsi difficile d’étudier l’impact de la croissance du nombre d’objets connectés sur la consommation électrique des infrastructures qui constituent l’Internet des objets.L’objectif de cette thèse est de proposer des modèles afin de permettre l’étude à grande échelle de la consommation énergétique des infrastructures Fog de manière efficace et reproductible. Les modèles proposés ont été intégrés à l’outil de simulation SimGrid afin d’être validés et diffusés
Fog Computing designates the migration of the computing and storage resources of the Cloud towards the edge of thenetwork. This resources migration allows to reduce the user’s nodes latency to answer to the evolution of the Internet usages. In parallel, the number of terminal is increasing with the development of the Internet Of Things. This infrastructures growth leads to an increase of the global energy consumption related to network infrastructures. However, this energy consumption is distributed and involved many actors such as: connected objects, local network, Internet Service Providers, Fog and Cloud infrastructures. Thus, it is difficult to study the impact of the connected objects growth on the infrastructures that composed the Internet of Things. The goal of this thesis is to propose models to study the energy consumption of large-scale Fog infrastructures in an efficient and reproducible manner. The proposed models have been integrated in the SimGrid simulation framework in order to be validated and spread

The aim of this work is to study methods of handover used in WiMAX and WLAN networks, next suggest the posibility of simulation methods for WLAN handover in the simulation environment OPNET Modeler. This work is focused primarily on obtaining the information about neighboring AP and subsequent selection of a new AP using such information. The work describes in detail each processes solutions that are used to implement newscanning methods

This thesis describes about theoretical design and practical realization of self-contained module for intensity and absorbed dose measuring of X-Radiation from High Voltage X-RAY industrial sources. In the first part, thesis is focused on ways and solutions of radiation protection and principles of measuring absorbed dose and intensity of radiation and possibilities of sending measured data through sensor networks. In the second part, the complete schematic of measuring module is solved, critical blocks are tested and design of PCB is done. Detection circuit, blocks for optical and acoustic signaling, power management and control of the entire device are designed. Detection circuit uses a GM Tube. Next, main box of whole device is designed and made by 3D printing technology. The next step is putting hardware into operation and writing test firmware included verification of wireless communication through WiFi.

碩士
國立彰化師範大學
電機工程學系
104
With the introduction of IOT and Industrial 4.0, the wireless network products have gain more popularity. Most electronic products will implement wireless modules to communicate and transfer data. Most wireless products use ISM (Industrial, Scientific and Medical) channels, in order to ensure data can be transferred in the compact wireless channels; the auto channel selection method is adopted to reduce the neighboring signal jamming. To make sure the wireless modules are compatible with each channel from the base station and achieve good transferring rate, the data and signal is measured for analysis and ensure the design meets specification. The signal of each channel and the data are measured and can be distrusted to clarify the problem. To deduct the radio noise factors of interference, the test is took in a RF (Radio frequency) shielding room, but it took many labor hours to test and has negative impact to human body. This research develops the automatic tool based on the V-shape model, it will automatically measure the wireless throughput and reduce labor hours then increase equipment utilization rate.

碩士
中華大學
電機工程學系碩士班
99
In this thesis，we discuss how to design and implementation of a Radio Frequency for Wi-Fi 802.11g Booster system，and it is base on RF power amplifier design rule with IEEE 802.11g stardand to design Wi-Fi RF booster module system，In this design the target is focus on antanna port which output power couold reach 24dBm and EVM under 5% performance. In this design ,we also discuss how to select key parts(PA,LNA)，system plan，circuit design，circuit verify，and assembly with golden unit，PCB Layout and placement。In the paper we discuss Wi-Fi transmit and receive structure，and 802.11g evolution and test process.In this design，it is base on 2.4GHz ISM band frequency and 20MHz bandwidth do the test。 In chapter 1 is Motivation，chapter 2 is 801.11g instruction and test，chapter 3 is for RF booster system design and therory discuss of circuit，chapter 4 is assembly with golden unit、Throughput test、and RF module sensitivity test、PCB Layout and PCB Placement。

碩士
國立臺北科技大學
環境工程與管理研究所
106
Wi-Fi is not only one of the major technologies for connecting mobile phones, tablets and computers but also widely used in agriculture, medical care, warehousing, logistics and personal home appliances. With the trend of many industries combining ICT technologies, we can see the ICT impact from personal life to society as a whole. There are many studies, which is about network energy consumption, and conduct related research, but the enabling effects of providing online services to replace traditional product are still rarely discussed. In view of the past, the studies often focused on exposing product environmental impact information. This study takes the effect of Wi-Fi module products providing network services indirectly into the medical industry as an example. Through the system dynamics software STELLA to construct the carbon emission model of traditional medical services and telemedicine services and to simulate the carbon emissions that can be reduced by telemedicine services in place of traditional medical services under different scenarios. Finally, the benefits are allocated to Wi-Fi module products by its economic value. The scenarios are mainly divided into baseline, telemedicine high adoption rate and the low adoption and simulate the demand for medical services and the adoption rate of telemedicine in the outlying islands from 2007 to 2036, and further estimate its carbon emissions. The simulation results show that the traditional medical carbon emission mainly comes from the patient transportation stage, and the telemedicine carbon emission mainly comes from the network transmission stage, and the telemedicine can reduce average 50.8 kg CO2e per person. In the baseline scenario, total carbon reduction in telemedicine reached 16,234 metric tons; in the context of high and low adoption rates of telemedicine, total carbon reductions were 19,161 metric tons and 13,140 metric tons, respectively. The Wi-Fi modules enabling effect by the economic allocation approach is a carbon reduction effect of 202 metric tons. With the situation of different telemedicine adoption rates, its enabling effect can reduce carbon emissions by up to 238 metric tons, with a minimum reduction of 164 metric tons.

Uma das preocupações mais patentes na sociedade de hoje relativamente à área da saúde é o envelhecimento da população. A pressão nas unidades de saúde tem vindo continuamente a acentuar-se na última década e tem como causas não só a elevada incidência de doenças crónicas mas também o contínuo aumento da exigência nos cuidados de saúde. Sob esta pressão surge uma oportunidade de inserção de tecnologias médicas avançadas que irão não só aliviar a pressão nos prestadores de cuidados de saúde mas também melhorar a qualidade destes. O objectivo deste projecto é desenvolver um protótipo de um sistema cuja função é proporcionar uma monitorização remota de sinais vitais tanto em ambiente hospitalar como domiciliário de forma a permitir aos profissionais clínicos o acesso aos dados dos sinais vitais em tempo-real e em qualquer parte. O sistema é constituído por sensores sem fios, que possam facilmente ser usados pelo paciente e que processam e transmitem por Bluetooth os sinais vitais para um Módulo Concentrador localizado nas imediações. Os dados são depois transmitidos remotamente para um Módulo Terminal onde são armazenados de forma a permitir o acesso a profissionais clínicos via um servidor Web ou uma central de enfermagem. As três tecnologias de comunicação remota usadas são Wi-Fi, Ethernet ou GSM/GPRS de forma a levar a cabo a integração do sistema tanto em ambiente hospitalar como domiciliário. No decurso desta tese vão ser analisados os requisitos do projecto e descrita uma solução personalizada de Monitorização Remota de Sinais Vitais que, por sua vez, inclui a integração de um oxímetro Bluetooth e transmissão de dados remota via Ethernet. A descrição do sistema inclui toda a especificação deste e a elaboração do firmware do Módulo Concentrador. Alguns testes realizados na fase final do projecto permitiram obter resultados que indicam que o sistema desenvolvido realiza correctamente as funções exigidas.

Project Work presented as the partial requirement for obtaining a Master's degree in Data Science and Advanced Analytics
Wireless networks are, currently, one of the main technologies used to connect people. Considering the constant advancements in the field, the telecom operators must guarantee a high-quality service to keep their customer portfolio. To ensure this high-quality service, it is common the establishment of partnerships with specialized technology companies that deliver software services to monitor the networks and identify faults and respective solutions. Although, a common barrier faced for these specialized companies is the lack of data to develop and test their products. This project’s purpose was to better understand Generative Adversarial Networks (GANs), an algorithm considered state-of-theart between the generative models, and test its usage to generate synthetic telecommunication data that can fill this gap. To do that, it was developed, trained and compared two of the most used GAN’s architectures, the Vanilla GAN and the WGAN. Both the models presented good results and was able to simulate datasets very similar to the real ones. The WGAN was chosen as the final model, but just for presenting a slightly and subjective better result on the descriptive analysis. In fact, the two models had very similar outputs and both can be used.

Kriging is proposed as a tool for Wi-Fi signal strength estimation for complex indoor environments. This proposal is based on two studies suggesting that kriging might be suitable for this application. Both of these studies have shortcomings in supporting this proposal, but their results encourage a more in depth investigation into this. Even though kriging is a geostatistical method developed for geographical interpolation, it has been used successfully in a wide range of other applications as well. This further suggests that kriging might be a versatile method to overcome some of the difficul- ties of existing signal strength estimation methods. Two main types of signal strength estimation are deterministic methods and empirical methods. Deterministic methods are generally very complex and requires input parameters that are difficult to obtain. Empirical methods are known to have low accuracy which makes them unreliable for practical use. Three main investigations are presented in order to evaluate the use of kriging for this application. A sampling plan is proposed as part of a generic application protocol for the practical use of kriging for Wi-Fi signal strength. It is concluded that kriging can be conffidently used as an estimation technique for Wi-Fi signal strength in complex indoor environments. Kriging is recommended for practical applications, especially where in- sufficient information is available about a building or where time consuming site surveys are not feasible.
MIng (Computer and Electronic Engineering), North-West University, Potchefstroom Campus, 2015

Στις σύγχρονες τηλεπικοινωνίες, χρησιμοποιείται μια μεγάλη γκάμα από RF μοντέλα, για τον υπολογισμό την μέσης τιμής ισχύος του σήματος εκπομπής για δεδομένη απόσταση από τον πομπό και για δεδομένη συχνότητα. Στις διεργασίες αυτές , επιδρούν στο δικό τους βαθμό διάφορες παράμετροι τοπολογικού (πληθυσμός , τύπος εμποδίων, πυκνότητα εμποδίων) και γεωγραφικού (μορφολογία εδάφους, υγρασία, διαμόρφωση χώρου) χαρακτήρα, αλλά και χαρακτηριστικά των πομποδεκτών ( συνήθως το ύψος και το κέρδος των κεραιών). Στις περισσότερες περιπτώσεις οι απώλειες όδευσης (Path Loss όπως είναι γνωστές στη διεθνή βιβλιογραφία) , εκφράζονται σε dB , σα συνάρτηση της συχνότητας λειτουργίας του υπό μελέτη συστήματος και της απόστασης ανάμεσα στον πομπό και το δέκτη ( πάντα για δεδομένα χαρακτηριστικά κεραιών και τύπο περιβάλλοντος). Έτσι μια ντετερμινιστική γνώση του μέσου path loss, που σε συνδυασμό με άλλες πιθανές απώλειες μας δίνει το σύνολο των απωλειών είναι εφικτή. O περιορισμός όσον αφορά στη συχνότητα και στις αποστάσεις , έχουν οδηγήσει τη σύγχρονη έρευνα στην επέκταση των υπαρχόντων μοντέλων , τόσο εξωτερικού όσο και εσωτερικού χώρου. Μια βασική παράμετρος της έρευνας στηρίζεται στην παραδοχή πως ο νόμος του αντιστρόφου τετραγώνου , ο οποίος περιγράφεται από την εξίσωση του Friis δε βρίσκει εφαρμογή, παρά μόνο σε περιβάλλοντα όπου επιτυγχάνεται LOS( Line of Sight) όδευση. Η τροποποίηση της παραπάνω εξίσωσης με δυναμικό ως προς το εκάστοτε περιβάλλον τρόπο , επιτρέπει πλέον τον υπολογισμό της μέσης ισχύος του σήματος σε σχετικά ρεαλιστικό βαθμό. Για παράδειγμα έχει προταθεί τροποποίηση με την τρίτη δύναμη της απόστασης για ένα σύνολο εφαρμογών , που αφορούν συστήματα ασυρμάτων τηλεπικοινωνιών εξωτερικού περιβάλλοντος.Ένα εσωτερικό περιβάλλον απαιτεί μια πολύ πιο ντετερμινιστική φόρμουλα υπολογισμού των απωλειών ώστε να μπορέσει ο μελετητής να υπολογίσει με αξιοπιστία την ισχύ του σήματος σε μια δεδομένη θέση. Η ακρίβεια λοιπόν των μοντέλων εξαρτάται άμεσα από την ικανότητά τους να απεικονίσουν και να αποδώσουν με τη σειρά τους , μέσω των υπολογισμών, όλα αυτά τα σύνθετα φαινόμενα με τον καλύτερο δυνατό τρόπο. Η πλειοψηφία των RF μοντέλων που αναπτύσσονται στα πλαίσια ακόλουθων παραγράφων, έχει αναπτυχθεί και αξιολογηθεί για συστήματα κυτταρικής κινητής τηλεφωνίας (GSM, PCS-1800, GPRS, UMTS). Προκειμένου να ξεπεραστούν διάφοροι περιορισμοί των αρχικών μοντέλων ως προς την συχνότητα λειτουργίας του συστήματος και την απόσταση πομπού-δέκτη (ουσιαστικά την εμβέλεια του μοντέλου), ορισμένες προεκτάσεις έχουν παρουσιαστεί σε διάφορες ερευνητικές εργασίες και χρησιμοποιούνται ευρέως . Ορισμένα νέα μοντέλα έχουν επίσης προστεθεί στα ήδη υπάρχοντα για τις συχνότητες συστημάτων κινητής τηλεφωνίας . Για άλλες περιοχές συχνοτήτων με έντονο ενδιαφέρον, πχ στα 5,2 GHz, διάφορες προτάσεις έχουν πραγματοποιηθεί, συχνά υποστηριζόμενες από μετρήσεις. Λαμβάνοντας υπόψη την συχνότητα των 2,4 GHz, δεν μπορούμε παρά να συμπεράνουμε ότι η όσο το δυνατόν πιο ακριβής και επιστημονικά αξιόπιστη μοντελοποίηση του ασύρματου διαύλου, ιδιαίτερα – άλλα όχι αποκλειστικά – για τοπολογίες εσωτερικών χώρων, είναι πολύ σημαντική για τον σχεδιασμό και την εύρυθμη λειτουργία των Wi-Fi συστημάτων και των WLAN δικτύων. Παρόλα αυτά, αν και στην υπάρχουσα βιβλιογραφία και στην διεθνή επιστημονική και ερευνητική κοινότητα υπάρχουν αρκετά σημαντικές εργασίες για την μοντελοποίηση του ασύρματου διαύλου στα 2,4 GHz , εντούτοις απουσίαζε, για πολύ καιρό, μία ολοκληρωμένη συγκριτική αντιπαραβολή και αξιολόγηση των βασικών θεωρητικών μοντέλων για τον υπολογισμό της μέσης απώλειας οδεύσεως στη συγκεκριμένη συχνότητα. Στα πλαίσια της εργασίας αυτής , θα προσπαθήσουμε να αξιοποιήσουμε το σύνολο των μετρήσεων και των δεδομένων που συλλέξαμε , σε ρεαλιστικές συνθήκες και για πραγματικά συστήματα μετάδοσης , τόσο να αξιολογήσουμε τα ήδη υπάρχοντα RF μοντέλα , όσο και να προβούμε στις απαραίτητες προτάσεις και τροποποιήσεις όπου αυτό κριθεί σκόπιμο. Επίσης για τη σκίαση επιχειρούμε εδώ μια προσέγγιση υπολογισμού μέσω της χρήσης των RF μοντέλων και την ενσωμάτωση όλων των χαρακτηριστικών διάδοσης , που αφορούν και στα δύο στοιχεία των μεγάλης κλίμακας διαλείψεων. Οι μετρήσεις μέσης λαμβανόμενης ισχύος πραγματοποιήθηκαν σε πέντε διαφορετικές τοπολογίες. Σε κάθε μία από αυτές τις τοπολογίες ελήφθησαν μετρήσεις της μέσης λαμβανόμενης ισχύος σε διάφορες δειγματοληπτικές αποστάσεις πομπού-δέκτη ούτως ώστε να είναι εφικτή, με έναν υψηλό βαθμό αξιοπιστίας, η αξιολόγηση των βασικών μοντέλων απωλειών οδεύσεως. Ταυτόχρονα, μέσα από αυτή την διαδικασία, αξιολογήθηκε η αξιοπιστία των μοντέλων αναφορικά με τις ιδιαιτερότητες της κάθε τοπολογίας, που αποτυπώνονται ποιοτικά και ποσοτικά στους μηχανισμούς διάδοσης του ραδιοσήματος σε κάθε περίπτωση.
In modern wireless communications, a wide range of RF models are used to provide the median (average) value of the signal strength at a given distance from the transmitter and for a given frequency spectrum. In this procedure, certain geographical (ground, humidity, terrain irregularities), topological (heavy or scattered population, type of obstacles, density of the buildings) characteristics of the area, as well as certain specifications of the transmitter and receiver antennas (most notably antenna height and antenna gain) have to be taken into consideration. In most cases, the mean value of the path loss is expressed in dB in dependence with the frequency of the operating system and the distance between the transmitter and the receiver (for given antenna characteristics and a certain type of environment where the system operates). Thus, a deterministic knowledge of the average path loss (which along with the average rain loss and diffraction loss provides the overall propagation loss in dB) is available. However, distance and frequency limitations have led research to a further study and expanding of the existing empirical and semi-empirical models , for both outdoor and indoor scenarios. A fundamental parameter-based study of the path loss models is based on the concept that the second power law that is predicted by the Friis equation does not apply in real-life scenarios except for standard LOS paths. The modified power law research allows engineers and scholars to calculate the mean received power of a signal transmitted over a wireless link in a more realistic approach. It has been suggested that the third-power law is more suitable for a plethora of applications based on wireless communications for an outdoor environment.The indoor propagation channel, in particular, demands a lot more than a deterministic formula of calculating the average signal strength as a function of distance and frequency. The increased impact of multipath and other propagation phenomena such as reflection and scattering, as well as the existence of many objects whose proportions are comparatively close to the wavelength of the operating wireless systems, render the propagation of a signal and its arrival at a receiver (mobile or fixed) a rather complex procedure. The precision of the path loss models depends heavily on their ability to demonstrate and reflect, in the calculations, these complex phenomena to the best possible way .The majority of these models have been developed and validated for mobile telephony systems in both outdoor and indoor schemes (GSM, PCS-1800, GPRS, UMTS). Certain extensions of many of these models were conducted in order to expand the frequency and distance limitation of the original formulas. New empirical models have also been suggested for these certain frequencies .Taking into account the very sensitive and subject to many different factors nature of the indoor propagation channel, it is easily concluded that both researchers in academia and engineers in industry need to have reliable models that will predict precisely the average path loss over the indoor 2.4 GHz channel which is of utter importance as the de facto frequency of Wi-Fi and WLAN systems. A gap in aforementioned research, however, is that it either concentrates on multipath parameters or does not feature a full comparative validation of most well-known indoor path loss models.The purpose of this work is to present, all the data collected through experiments in realistic conditions and real telecom systems, in order to validate and modify (where necessary) the existing RF models. Furthermore an empirical formula to measure attenuation due to shadowing is derived through these RF models.Measurements took part in five different topologies. In each of them the mean received power was recorded, for various distances between the transmitter and the receiver, in order for our endeavor to validate the RF models in question to be reliable. Through this procedure, RF models where examined towards each topology’s distinctive characteristics that reflect in quality and quantity all the attenuation mechanisms that affect the propagated signal.