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Wireless
Wireless
communication, or sometimes simply wireless, is the transfer of information or power between two or more points that are not connected by an electrical conductor. The most common wireless technologies use radio waves. With radio waves distances can be short, such as a few meters for Bluetooth
Bluetooth
or as far as millions of kilometers for deep-space radio communications. It encompasses various types of fixed, mobile, and portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of applications of radio wireless technology include GPS units, garage door openers, wireless computer mice, keyboards and headsets, headphones, radio receivers, satellite television, broadcast television and cordless telephones. Somewhat less common methods of achieving wireless communications include the use of other electromagnetic wireless technologies, such as light, magnetic, or electric fields or the use of sound. The term wireless has been used twice in communications history, with slightly different meaning. It was initially used from about 1890 for the first radio transmitting and receiving technology, as in wireless telegraphy, until the new word radio replaced it around 1920. The term was revived in the 1980s and 1990s mainly to distinguish digital devices that communicate without wires, such as the examples listed in the previous paragraph, from those that require wires or cables. This became its primary usage in the 2000s, due to the advent of technologies such as LTE, LTE-Advanced, Wi-Fi
Wi-Fi
and Bluetooth. Wireless
Wireless
operations permit services, such as long-range communications, that are impossible or impractical to implement with the use of wires. The term is commonly used in the telecommunications industry to refer to telecommunications systems (e.g. radio transmitters and receivers, remote controls, etc.) which use some form of energy (e.g. radio waves, acoustic energy,) to transfer information without the use of wires.[1] Information is transferred in this manner over both short and long distances.

Contents

1 History

1.1 Photophone 1.2 Electricity
Electricity
based wireless

1.2.1 Early wireless 1.2.2 Radio
Radio
waves

2 Modes

2.1 Radio 2.2 Free-space optical 2.3 Sonic 2.4 Electromagnetic induction

3 Services 4 Electromagnetic spectrum 5 Applications

5.1 Mobile telephones 5.2 Data communications

5.2.1 Peripheries

5.3 Energy transfer 5.4 Medical technologies

6 Categories of implementations, devices and standards 7 See also 8 References 9 Further reading 10 External links

History[edit] See also: History of telecommunication Photophone[edit] Main article: Photophone

Bell and Tainter's photophone, of 1880.

The world's first wireless telephone conversation occurred in 1880, when Alexander Graham Bell
Alexander Graham Bell
and Charles Sumner Tainter
Charles Sumner Tainter
invented and patented the photophone, a telephone that conducted audio conversations wirelessly over modulated light beams (which are narrow projections of electromagnetic waves). In that distant era, when utilities did not yet exist to provide electricity and lasers had not even been imagined in science fiction, there were no practical applications for their invention, which was highly limited by the availability of both sunlight and good weather. Similar to free-space optical communication, the photophone also required a clear line of sight between its transmitter and its receiver. It would be several decades before the photophone's principles found their first practical applications in military communications and later in fiber-optic communications.[2][3] Electricity
Electricity
based wireless[edit] Early wireless[edit] Main article: Wireless
Wireless
telegraphy A number of wireless electrical signaling schemes including sending electric currents through water and the ground using electrostatic and electromagnetic induction were investigated for telegraphy in the late 19th century before practical radio systems became available. These included a patented induction system by Thomas Edison allowing a telegraph on a running train to connect with telegraph wires running parallel to the tracks, a William Preece
William Preece
induction telegraph system for sending messages across bodies of water, and several operational and proposed telegraphy and voice earth conduction systems. The Edison system was used by stranded trains during the Great Blizzard of 1888 and earth conductive systems found limited use between trenches during World War I
World War I
but these systems were never successful economically. Radio
Radio
waves[edit] Main article: History of radio

Marconi transmitting the first radio signal across the Atlantic.

In 1894 Guglielmo Marconi
Guglielmo Marconi
began developing a wireless telegraph system using radio waves, which had been known about since proof of their existence in 1888 by Heinrich Hertz, but discounted as communication format since they seemed, at the time, to be a short range phenomenon.[4] Marconi soon developed a system that was transmitting signals way beyond distances anyone could have predicted (due in part to the signals bouncing off the then unknown ionosphere). Guglielmo Marconi and Karl Ferdinand Braun
Karl Ferdinand Braun
were awarded the 1909 Nobel Prize for Physics for their contribution to this form of wireless telegraphy. Modes[edit] Wireless
Wireless
communications can be via: Radio[edit] Main articles: Radio
Radio
and Microwave
Microwave
transmission Radio
Radio
and microwave communication carry information by modulating properties of electromagnetic waves transmitted through space. Free-space optical[edit] Main article: Free-space optical communication

An 8-beam free space optics laser link, rated for 1 Gbit/s at a distance of approximately 2 km. The receptor is the large disc in the middle, the transmitters the smaller ones. To the top and right corner a monocular for assisting the alignment of the two heads.

Free-space optical communication
Free-space optical communication
(FSO) is an optical communication technology that uses light propagating in free space to transmit wirelessly data for telecommunications or computer networking. "Free space" means the light beams travel through the open air or outer space. This contrasts with other communication technologies that use light beams traveling through transmission lines such as optical fiber or dielectric "light pipes". The technology is useful where physical connections are impractical due to high costs or other considerations. For example, free space optical links are used in cities between office buildings which are not wired for networking, where the cost of running cable through the building and under the street would be prohibitive. Another widely used example is consumer IR devices such as remote controls and IrDA (Infrared Data Association) networking, which is used as an alternative to WiFi
WiFi
networking to allow laptops, PDAs, printers, and digital cameras to exchange data. Sonic[edit] Sonic, especially ultrasonic short range communication involves the transmission and reception of sound. Electromagnetic induction[edit] Electromagnetic induction
Electromagnetic induction
has short range communication and power. This has been used in biomedical situations such as pacemakers, as well as for short-range Rfid tags. Services[edit] Common examples of wireless equipment include:[5][6]

Infrared and ultrasonic remote control devices Professional LMR (Land Mobile Radio) and SMR (Specialized Mobile Radio) typically used by business, industrial and Public Safety entities. Consumer Two-way radio
Two-way radio
including FRS Family Radio
Radio
Service, GMRS (General Mobile Radio
Radio
Service) and Citizens band ("CB") radios. The Amateur Radio
Radio
Service (Ham radio). Consumer and professional Marine VHF radios. Airband
Airband
and radio navigation equipment used by aviators and air traffic control Cellular telephones and pagers: provide connectivity for portable and mobile applications, both personal and business. Global Positioning System
Global Positioning System
(GPS): allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth.[7] Cordless computer peripherals: the cordless mouse is a common example; wireless headphones, keyboards, and printers can also be linked to a computer via wireless using technology such as Wireless USB
Wireless USB
or Bluetooth Cordless telephone
Cordless telephone
sets: these are limited-range devices, not to be confused with cell phones. Satellite television: Is broadcast from satellites in geostationary orbit. Typical services use direct broadcast satellite to provide multiple television channels to viewers.

Electromagnetic spectrum[edit] See also: Spectrum management Light, colors, AM and FM radio, and electronic devices make use of the electromagnetic spectrum. The frequencies of the radio spectrum that are available for use for communication are treated as a public resource and are regulated by national organizations such as the Federal Communications Commission
Federal Communications Commission
in the USA, or Ofcom
Ofcom
in the United Kingdom, or “international as ITU-R”, or European as ETSI. This determines which frequency ranges can be used for what purpose and by whom. In the absence of such control or alternative arrangements such as a privatized electromagnetic spectrum, chaos might result if, for example, airlines did not have specific frequencies to work under and an amateur radio operator were interfering with the pilot's ability to land an aircraft. Wireless
Wireless
communication spans the spectrum from 9 kHz to 300 GHz.[citation needed] Applications[edit] Mobile telephones[edit] One of the best-known examples of wireless technology is the mobile phone, also known as a cellular phone, with more than 6.6 billion mobile cellular subscriptions worldwide as of the end of 2010.[8] These wireless phones use radio waves from signal-transmission towers to enable their users to make phone calls from many locations worldwide. They can be used within range of the mobile telephone site used to house the equipment required to transmit and receive the radio signals from these instruments.[9] Data communications[edit] Wireless
Wireless
data communications allows wireless networking between desktop computers, laptops, tablet computers, cell phones and other related devices. The various available technologies differ in local availability, coverage range and performance,[10][11] and in some circumstances users employ multiple connection types and switch between them[12] using connection manager software[13][14] or a mobile VPN to handle the multiple connections as a secure, single virtual network.[15] Supporting technologies include:

Wi-Fi
Wi-Fi
is a wireless local area network that enables portable computing devices to connect easily with other devices, peripheries, and the Internet.[16] Standardized as IEEE 802.11
IEEE 802.11
a,b,g,n, Wi-Fi
Wi-Fi
approaches speeds of some types of wired Ethernet. Wi-Fi
Wi-Fi
has become the de facto standard for access in private homes, within offices, and at public hotspots.[17] Some businesses charge customers a monthly fee for service, while others have begun offering it free in an effort to increase the sales of their goods.[18]

Cellular data service offers coverage within a range of 10-15 miles from the nearest cell site.[10] Speeds have increased as technologies have evolved, from earlier technologies such as GSM, CDMA and GPRS, to 4G networks such as W-CDMA, EDGE or CDMA2000.[19][20]

Low Power Wide Area Networks (LPWAN) bridge the gap between Wi-Fi
Wi-Fi
and Cellular for low bitrate IoT applications. Mobile Satellite Communications may be used where other wireless connections are unavailable, such as in largely rural areas[21] or remote locations.[10] Satellite communications are especially important for transportation, aviation, maritime and military use.[22]

Wireless
Wireless
Sensor Networks are responsible for sensing noise, interference, and activity in data collection networks. This allows us to detect relevant quantities, monitor and collect data, formulate clear user displays, and to perform decision-making functions[23][24]

Wireless
Wireless
data communications are used to span a distance beyond the capabilities of typical cabling in point-to-point communication and point-to-multipoint communication, to provide a backup communications link in case of normal network failure, to link portable or temporary workstations, to overcome situations where normal cabling is difficult or financially impractical, or to remotely connect mobile users or networks. Peripheries[edit] Periphery devices in computing can also be connected wirelessly as part of a Wi-Fi
Wi-Fi
network or directly by optical infer-red, Bluetooth
Bluetooth
or Wireless
Wireless
USB. Originally these units used bulky, highly local transceivers to mediate between a computer and a keyboard and mouse; however, more recent generations have used small, higher-quality devices. A battery powers computer interface devices such as a keyboard or mouse and send signals to a receiver through a USB port by the way of an optical or radio frequency (RF) receiver. A RF design makes it possible to expand the range of efficient use, usually up to 10 feet but distance, physical obstacles, competing signals, and even human bodies can all degrade the signal quality.[25] Concerns about the security of wireless keyboards arose at the end of 2007, when it was revealed that Microsoft's implementation of encryption in some of its 27 MHz models was highly insecure.[26] Energy transfer[edit] Main article: Wireless
Wireless
energy transfer Wireless energy transfer
Wireless energy transfer
is a process whereby electrical energy is transmitted from a power source to an electrical load (Computer Load) that does not have a built-in power source, without the use of interconnecting wires. There are two different fundamental methods for wireless energy transfer. They can be transferred using either far-field methods that involve beaming power/lasers, radio or microwave transmissions or near-field using induction. Both methods utilize electromagnetism and magnetic fields.[27] Medical technologies[edit] New wireless technologies, such as mobile body area networks (MBAN), have the capability to monitor blood pressure, heart rate, oxygen level and body temperature. The MBAN works by sending low powered wireless signals to receivers that feed into nursing stations or monitoring sites. This technology helps with the intentional and unintentional risk of infection or disconnection that arise from wired connections.[28] Categories of implementations, devices and standards[edit]

Radio
Radio
station in accordance with ITU RR (article 1.61) Radiocommunication service
Radiocommunication service
in accordance with ITU RR (article 1.19) Radio
Radio
communication system Land Mobile Radio
Radio
or Professional Mobile Radio: TETRA, P25, OpenSky, EDACS, DMR, dPMR Cordless telephony:DECT (Digital Enhanced Cordless Telecommunications) Cellular networks: 0G, 1G, 2G, 3G, Beyond 3G (4G), Future wireless List of emerging technologies Short-range point-to-point communication : Wireless
Wireless
microphones, Remote controls, IrDA, RFID ( Radio
Radio
Frequency Identification), TransferJet, Wireless
Wireless
USB, DSRC (Dedicated Short Range Communications), EnOcean, Near Field Communication Wireless
Wireless
sensor networks: ZigBee, EnOcean; Personal area networks, Bluetooth, TransferJet, Ultra-wideband (UWB from WiMedia Alliance). Wireless
Wireless
networks: Wireless LAN
Wireless LAN
(WLAN), ( IEEE 802.11
IEEE 802.11
branded as Wi-Fi and HiperLAN), Wireless
Wireless
Metropolitan Area Networks (WMAN) and (LMDS, WiMAX, and HiperMAN)

See also[edit]

Comparison of wireless data standards Digital radio Hotspot (Wi-Fi) Li-Fi List of emerging technologies MiFi Mobile (other) Personal area network Radio
Radio
antenna Radio
Radio
resource management (RRM) Terrestrial television Timeline of radio Tuner (radio) Wireless
Wireless
access point Wireless
Wireless
security Wireless Wide Area Network (True wireless)

References[edit]

^ "ATIS Telecom Glossary 2007". atis.org. Retrieved 2008-03-16.  ^ "Photo- and Graphophone". http://www.fi.edu.  External link in journal= (help) ^ "Alexander Graham Bell's Photophone
Photophone
– Ahead of its Time". http://inventors.about.com.  External link in journal= (help) ^ Icons of Invention: The Makers of the Modern World from Gutenberg to Gates. ABC-CLIO. 2009. p. 162. ISBN 978-0-313-34743-6.  ^ Tech Target – Definition of Wireless
Wireless
– Posted by Margaret Rouse (April 2 control and traffic control systems ^ " Wireless
Wireless
headphones". Retrieved 25 May 2015.  ^ Tsai, Allen. "AT&T Releases Navigator GPS Service with Speech Recognition". Telecom Industry News. Retrieved 2 April 2008.  ^ Robust demand for mobile phone service will continue; UN agency predicts UN News Centre February 15, 2010, ^ Vilorio, Dennis. "You're a what? Tower Climber" (PDF). Occupational Outlook Quarterly. Archived (PDF) from the original on February 3, 2013. Retrieved December 6, 2013.  ^ a b c "High Speed Internet
Internet
on the Road". Archived from the original on September 3, 2011. Retrieved September 6, 2011.  ^ Mitchell, Bradley. Wireless
Wireless
Internet
Internet
Service: An Introduction ^ Franconi, N. G.; Bunger, A; Sejdic, E; Mickle, M. H. (2014). " Wireless
Wireless
Communication in Oil and Gas Wells". Energy Technology. 2: 996–1005. doi:10.1002/ente.201402067.  ^ What is Connection Manager? Microsoft Technet, March 28, 2003 ^ Unwired Revolution ^ http://www.gd-itronix.com/index.cfm?page=Products:MobilityXE ^ About.com ^ "Wi-Fi" ^ O'Brien, J. & Marakas, G.M.(2008) Management Information Systems (pp. 239). New York, NY: McGraw-Hill Irwin ^ Lachu Aravamudhan, Stefano Faccin, Risto Mononen, Basavaraj Patil, Yousuf Saifullah, Sarvesh Sharma, Srinivas Sreemanthula. "Getting to Know Wireless
Wireless
Networks and Technology", InformIT ^ "What really is a Third Generation (3G) Mobile Technology", ITU ^ Geier, Jim. Wireless
Wireless
Network Industry Report 2007, Wireless-Nets, Ltd., 2008 ^ Ilcev, Stojce Dimov, Global Mobile Satellite Communications for Maritime, Land and Aeronautical Applications, Springer, 2006 ^ F.L. Lewis. " Wireless
Wireless
Sensor Networks." Smart Environments: Technologies, Protocols, and Applications, ed. D.J. Cook and S.K. Das, John Wiley, New York, 2004. Automation and robotics research institute. 26 Oct. 2013 ^ Franconi, Nicholas G.; Bunger, Andrew P.; Sejdić, Ervin; Mickle, Marlin H. (2014-12-01). " Wireless
Wireless
Communication in Oil and Gas Wells". Energy Technology. 2 (12): 996–1005. doi:10.1002/ente.201402067. ISSN 2194-4296.  ^ Paventi, Jared. "How does a Wireless
Wireless
Keyboard Work." Ehow. Web. 26 Oct. 2013. ^ Moser, Max; Schrödel, Philipp (2007-12-05). "27Mhz Wireless Keyboard Analysis Report aka "We know what you typed last summer"" (PDF). Retrieved 6 February 2012.  ^ Jones, George. "Future Proof. How Wireless
Wireless
Energy Transfer Will Kill the Power Cable." MaximumPC. 14 Sept. 2010. Web. 26 Oct. 2013. ^ Linebaugh, Kate. "Medical Devices in Hospitals go wireless." Online.wsj. The Wall Street Journal. 23 May 2010. Web. 27 Oct. 2013.

Further reading[edit]

Pahlavan, Kaveh; Levesque, Allen H (1995). Wireless
Wireless
Information Networks. John Wiley & Sons. ISBN 0-471-10607-0.  Geier, Jim (2001). Wireless
Wireless
LANs. Sams. ISBN 0-672-32058-4.  Goldsmith, Andrea (2005). Wireless
Wireless
Communications. Cambridge University Press. ISBN 0-521-83716-2.  Molisch, Andreas (2005). Wireless
Wireless
Communications. Wiley-IEEE Press. ISBN 0-470-84888-X.  Pahlavan, Kaveh; Krishnamurthy, Prashant (2002). Principles of Wireless
Wireless
Networks – a Unified Approach. Prentice Hall. ISBN 0-13-093003-2.  Rappaport, Theodore (2002). Wireless
Wireless
Communications: Principles and Practice. Prentice Hall. ISBN 0-13-042232-0.  Rhoton, John (2001). The Wireless
Wireless
Internet
Internet
Explained. Digital Press. ISBN 1-55558-257-5.  Tse, David; Viswanath, Pramod (2005). Fundamentals of Wireless Communication. Cambridge University Press. ISBN 0-521-84527-0.  Larsson, Erik; Stoica, Petre (2003). Space-Time Block Coding For Wireless
Wireless
Communications. Cambridge University Press. 

External links[edit]

Look up wireless in Wiktionary, the free dictionary.

Nets, Webs and the Information Infrastructure at Wikibooks

Wireless
Wireless
at Curlie (based on DMOZ) Bibliography - History of wireless and radio broadcasting

v t e

Telecommunications

History

Beacon Broadcasting Cable protection system Cable TV Communications satellite Computer network Drums Electrical telegraph Fax Heliographs Hydraulic telegraph Internet Mass media Mobile phone Optical telecommunication Optical telegraphy Pager Photophone Prepay mobile phone Radio Radiotelephone Satellite communications Semaphore Smartphone Smoke signals Telecommunications
Telecommunications
history Telautograph Telegraphy Teleprinter
Teleprinter
(teletype) Telephone The Telephone Cases Television Timeline of communication technology Undersea telegraph line Videoconferencing Videophone Videotelephony Whistled language

Pioneers

Edwin Howard Armstrong John Logie Baird Paul Baran Alexander Graham Bell Tim Berners-Lee Jagadish Chandra Bose Vint Cerf Claude Chappe Donald Davies Lee de Forest Philo Farnsworth Reginald Fessenden Elisha Gray Erna Schneider Hoover Charles K. Kao Hedy Lamarr Innocenzo Manzetti Guglielmo Marconi Antonio Meucci Radia Perlman Alexander Stepanovich Popov Johann Philipp Reis Nikola Tesla Camille Tissot Alfred Vail Charles Wheatstone Vladimir K. Zworykin

Transmission media

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Optical fiber

Free-space optical communication Molecular communication Radio
Radio
waves Transmission line

Network topology and switching

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Multiplexing

Space-division Frequency-division Time-division Polarization-division Orbital angular-momentum Code-division

Networks

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