Wi-fi technology how it works pdf

It has many advantages such as flexible, responsive, customized, fast, costeffective, secure. Like mobile phones, a wifi network makes use of radio waves to transmit information across a network. Requires support for wi fi protected setup with its pushbutton or pinbased setup. The wi fi alliance the standards body that oversees wi fi technology lists these four key benefits of wi fi 6. Wifi wireless technology working principles, types and. Digital technology is used to convert data, such as short messages, email or digital pictures, into small packets of 0s and 1s. And gets better over time with new features and improved performance. Compatible devices can network through a wireless access point to each other as well as to wired devices and the internet. Wireless network is the recent development in the arena of network technologies.

A range extender, wifi booster or wifi extender is a device that repeats the wireless signal from your router to expand its coverage. Lifi comprises of multiple lightbulbs that form a wireless network. Lifi is a wireless technology holds the key to solving challenges faced by 5g. Internet and voip phone access, gaming, and basic connectivity of consumer electronics such as televisions and dvd players, or digital cameras. At most, ethernet devices could have only a few hundred meters of cable between them, making it impractical to connect geographically dispersed locations. While the various wifi variants that have emerged from the original 802. Near field communication, or nfc for short, is an offshoot of radiofrequency identification rfid with the exception that nfc is designed for use by devices within close proximity to each other. Apr 29, 2020 wi fi 6 is the wi fi alliances name for 802. That makes it a lineofsight technology your wireless modem or phone will need to be close to a base station for best transfer speeds. Wi fi direct allows wi fi devices to talk to each other without the need for wireless access points wi fi direct essentially embeds a software access point, or soft ap, into any device that wishes to support direct. This same signal will be transmitted, via an antenna, to a decoder known as the router.

The main requirement for wifi is that theres a device that can transmit the wireless signal, like a router, phone, or computer. Obviously, the wifi alliance wanted something more catchy than a name that most regular users wouldnt ever get a hang of. Not requiring an explicit network of wires and permitting communication while on the move. How a wifi network works a wifi hotspot is created by installing an access point to an internet connection. In terms of the osi reference model, the radio signal operates at the physical layer, and the data format controls several of the higher layers. Wifi and lifi are similar because both technologies are wireless, but also very different, because unlike wifi, which relies on radio waves, lifi uses visible light communication vlc or infrared and nearuv spectrum waves. An oscillator in your router sends out a message coded in an electromagnetic wave. Thus, it works much like your personal computer does to send and receive information. This provides a focus for the work of equipment developers and service providers and is as much a contributor to the growth of wireless networking as the power of the underlying technologies. The radio waves are keys which make the wifi networking possible. They have the ability to convert 1s and 0s into radio waves and then back into 1s and 0s. In other words, because millimeter wave 5g signals have weaker propagation compared to 4g, service providers will have to create a denser infrastructure to ensure consistent service. The radio transmitters and receivers are built into wifi enabled equipment such as routers, laptops, and phones. When wifi enabled device encounters a hotspot the device can then connect to that network wirelessly.

Note that wifi is actually a wireless brand owned by the wifi alliance, which is a nonprofit organization that promotes wifi technology and wifi products. Although bluetooth technology has become synonymous with headphones, its used for all kinds of wireless devices. Think of it as a system of multiple wifi extenders, but one thats much easier to set upand doesnt require multiple network names or any other quirks that some extenders have. It would be suitable for some places where cellular network quality is poor and user still have the option to connect to the network without cellular reception. Wifi wifi is a technology for wlan based on the ieee 802. Your phone, smart watch, tablet, wireless headphones, or other device doesnt need to be plugged into the charger with a wire, but the wireless charger itself still has to be plugged into a wall outlet to function. From the users perspective, wi fi is internet access from a wirelesscapable device like a phone, tablet, or laptop. It is important for users to pick out a wifi software tool that is compatible with their computer and its dynamics. Wifi is the name given by the wifi alliance to the ieee 802. Wi fi network connect computers to each other, to the internet and to the wired. Wifi is a technology that uses radio waves to provide network connectivity. The term wifi emerged in the 1990s from the words wireless plus fi, which was an arbitrary second element. The name wi fi is a play on the shortform for highfidelity or hi fi. An aim of this page and the website is to provide easytounderstand information in one place and to deepen your understanding of the how does wireless technology work in a particular topic, when you need it.

The ease of connecting to the network has further helped in coming with the devices. Wifi works off of the same principal as other wireless devices it uses radio frequencies to send signals between devices. Lifi can transmit at multiple gigabits, is more reliable, virtually interference free and uniquely more secure than radio technology such as wi fi or cellular. When wi fi enabled device encounters a hotspot the device can then connect to that network wirelessly. Jul 20, 2015 wifi is a technology that uses radio waves to send and receive signals from nearby devices to provide internet access to the devices connected to it. Operating rooms do not allow wi fi over radiation concerns, and there is also that whole lack of dedicated spectrum. To get around this problem, passive wifi uses backscatter to decouple the baseband wifi digital logic from the powerconsuming rf components, as shown in fig. The name wifi is a play on the shortform for highfidelity or hifi. The network structure includes the wireless network interface adapters and base stations that send and receive the radio signals. The technology uses radio signals to transmit information between your wifi enabled devices and the internet, allowing the device to receive information. An introduction to lifi technology history lifi vs wi. A wireless phone is actually a computer connected to a radio. Mar 25, 2015 it is important for users to pick out a wi fi software tool that is compatible with their computer and its dynamics.

So, in pretty high level terms there is a wifi access point. We live in a modern age where staying connected seems like one of the most important aspects of life. It utilizes a type of broadband wireless communication to transmit data signals and voice signals across the world. Wifi working principle, types of technologies and applications. How does wireless internet work wireless technology advisor. Medical devices, laptops, and digital audio players also use wifi.

This provides a focus for the work of equipment developers and service. Li fi is a derivative of optical wireless communications owc technology, which uses light from lightemitting diodes leds as a medium to deliver network, mobile, highspeed communication in a similar manner to wi fi. Jul 15, 2015 wifi works off of the same principal as other wireless devices it uses radio frequencies to send signals between devices. In each episode, well take a look at a different aspect of wifi to build your. What is wifi how it works you must have been to an airport, hotel, coffee shop, library or any event where you have encountered this wireless networking technology.

Sep 05, 2018 li fi and wi fi are both used for wireless communication and transmission of data. Application of li fi technology you might just live longer you might just live longer for a long time, med ical technology has lagged behind the rest of the wireless world. Yet near field communication utilizes electromagnetic radio fields while technologies such as bluetooth and wifi focus on radio transmissions instead. The different versions of wifi are specified by various ieee 802. Wifi has been developed for mobile computing devices, such has laptops, but it is now. Introduction to wireless technology the term wireless communication refers to the transfer of information using electromagnetic em or acoustic waves over the atmosphere rather than using any propagation medium that employs wires.

Doesnt include similar wireless technologies such as bluetooth or zigbee. Wifi offloading is one the main feature of the future networks. Wifi direct is built upon the same wifi technology used by most modern consumer electronic devices to communicate with wireless routers. They dont have cables attached to them for transmitting information and neither will your computer once you start using wifi. Although many have come and gone, bluetooth, a wireless. Wifi works the same way as tvs, cell phones, and radios. Wifi uses multiple parts of the ieee 802 protocol family and is designed to seamlessly interwork with its wired sibling ethernet. But a standard doesnt mean that all 5g will work the same or that we even know. How a wi fi network works a wi fi hotspot is created by installing an access point to an internet connection. Wireless charging helps solve billys problem by keeping him charged up wherever he goes. Wifi is a registered trademark of the wifi alliance.

Wireless technologies have removed the obstacles to work on any remote area carrying personal digital assistant. In our architecture, the passive wifi devices perform. Fortunately, all of this radio technology is hidden in a wifi card and is completely invisible. Lifi is a highspeed wireless communication technology that uses visible light presently using leds to transmit information. Wi fi is a generic term that refers to the ieee 802. There are three big differences between wifi radios and. Wifi works, in essence, exactly the same way a television or cell phone works. How wifi works up to a point, its quite possible to treat your wireless network as a set of black boxes that you can turn on and use without knowing much about the way they work.

To answer the question how does wireless internet work, we first need to look at what the internet is. The wireless network is operating three essential elements that are radio signals, antenna and router. While the various wifi variants that have emerged from the. Current wifi systems support a peak physicallayer data rate of 54 mbps and typically provide indoor coverage over a distance of 100 feet. Before you start proceeding with this tutorial, we are making an assumption that you are. Reference model application transport network data link physical medium data link physical application transport. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Wifi wireless networking sends radio transmissions on specific frequencies where listening devices can receive them. This tutorial gives you a basic understanding on wifi. There is an emphasis on security issues and the available security protocols. Ethernet is a local area technology, with networks traditionally operating within a single building, connecting devices in close proximity. Your computer or phone has an antenna inside it, which is just a stick of metal with lots of electrons to feel the tug.

This consists of a radio transmitter receiver that is connected to an eth. Wireless charging as a concept has been around since inventor and physicist nikola tesla first concluded that you could transfer power between two objects via an electromagnetic. Wi fi technology has its origins in a 1985 ruling by the u. It is a pretty broad question and i am assuming we are talking about wifi the most common wlan technology. Introduction to wireless networks 15 wireless data networks each type of wireless data network operates on a specific set of radio frequencies. Thats the way most people relate to all of the technology that surrounds themyou shouldnt have to worry about the 802. As our world has grown increasingly connected, weve adopted a number of technologies to help us stay in contact with our friends and family. Return from how does wireless technology work to the home page. A connection is established using a wireless adapter to create hotspots areas in the vicinity of a wireless router that are connected to the network and allow users to access internet services. Aps from different vendors may not work well with each other to provide an uninterrupted connection. The radio frequencies are completely different say from walky talkies. When an electrical current is applied to a led light bulb a stream of light photons is emitted from the bulb. Lifi is high speed bidirectional networked and mobile communication of data using light.

Wireless charging is, to put it simply, charging an electronic device without the use of a connecting wire. By using this technology we can exchange the information between two or more devices. How wireless networks works radio waves are used in a wireless network just as they are used in televisions, mobile phones, and radios. Low cost and simplicity are some of the reasons why wifi is so. Almost every person uses wifi at some point in their day. Introduction to wireless networks when you invent a new network. Computer engineers are working around the clock just to come up with. Adding wifi to a computer one of the best things about wifi is how simple it is.

These packets are also transmitted securely over wireless systems. Wifi is primarily a local area networking lan technology designed to provide inbuilding. Wifi transmissions on sensors and mobile devices still consume hundreds of milliwatts of power 33. It functions as a bridge, capturing the wifi from your router and rebroadcasting it to areas where the wifi is weak or nonexistent, improving the performance of your home wifi. Apbased topology infrastructure mode peertopeer topology adhoc mode. If youve been in an airport, coffee shop, library or hotel recently, chances are youve been right in the middle of a wireless network. Once decoded, the data will be sent to the internet. The prime benefits of 5g devices will be significantly faster speeds in data access, downloading and streaming content. Stream video, get work done, or swipe right in any room not just next to your router. Jul 03, 2018 wifi pronounced whyfy is a term that was coined by a branding company in 1999 as a name which would be easily recalled, due to its similarity to the then wellknown term hifi. Antennas are key components of these radio communication systems. Over the past decade, wifiwireless networking has become very popular.

It allows two devices to communicate with each other, provided that at least one of them is compliant with the standard to establish a peertopeer connection. In fact, one of the only things many do know is that sometimes it doesnt. Wireless charging technology has been around for more than 100 years, but its inclusion in devices such as apples new iphone line has given it new life. Wi fi wireless fidelity is a generic term that refers to the ieee 802. Wi fi, for example, uses radio waves transmitted over modems whereas on the other hand li fi uses visible light from led bulbs for transmission and receiving of data.

The best is yet to come 20 years since the first wifi standard, the technology is poised for a surge of innovation. Wi fi is the name given by the wi fi alliance to the ieee 802. Basically, wifi uses radio waves to transmit the information to and from the internet or your computer network. Most modern devices support wi fi so that the devices can access a network to gain internet access and share network resources. Wifi is a perfect example of one of these emerging technologies, which has enabled. Such networks are made up of cells that provide coverage across the network. They work in perfect unison to deliver hyperfast, superstable wifi to every square foot. In a typical home, a router transmits an internet connection coming from outside the network, like an isp, and delivers that service to nearby devices that can reach the wireless signal. Wifi is a high speed internet connection and network connection without use of any cables or wires. As the wireless industry converts to packetbased networks, utilizing the same technology as the internet, wireless data services continue to expand. Wifi is primarily a local area networking lan technology designed to provide inbuilding broadband coverage. With wireless charging, billy can keep using his phone and be happy. The wireless power market is expected to grow to one billion charging units by 2020, according to ihs, a market research firm in london.

Computer networks have played a major role in expanding the. The term lifi, which is short for light fidelity, was coined by one of the pioneers in the technology, professor harald haas during a tedx talk in the year 2011. Wifi is a technology that allows tablets, video game consoles, printers, and smartphones to communicate with the internet. Communication in a wireless network is very similar to two way radio communication. Wi fi, networking technology that uses radio waves to allow highspeed data transfer over short distances. Audience this tutorial has been prepared for readers to help them understand the concepts related to wifi. Wifi, in fact, is one of the easiest technologies that you will ever use. How does wireless internet work at home or in the office how does information travel between your computer and the internet how does wireless internet work in a city how does wireless internet work in a remote area what is the internet. Federal communications commission that released the bands of the radio spectrum at 900 megahertz mhz, 2. It allows the user to connect using wifi network and the cellular network can be allocated to other users. It is a completely different technology that uses a.

Wi fi is a technology that allows computers to connect to each other, or other networks of computers such as the internet, without using wires. The computer should include a wireless adapter that will translate data sent into a radio signal. It was named after its predecessor, and the currently prevailing technology, wifi, which stands for wireless fidelity. For example, most wi fi networks operate in a special band of radio frequencies around 2. Introduction wireless technology is an alternative to wired technology, which is commonly used, for connecting devices in wireless mode. Wifi is a technology that allows computers to connect to each other, or other networks of computers such as the internet, without using wires. M ost computer users know little about how wifi works. Many people also use wireless networking, also called wifi or 802.