The world's first wireless telephone conversation occurred in 1880, when "Alexander Graham Bell and "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.
Electricity based wireless
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 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 but these systems were never successful economically.
In 1894 "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. 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 were awarded the 1909 "Nobel Prize for Physics for their contribution to this form of wireless telegraphy.
Wireless communications can be via:
"radio communication, "microwave communication, for example long-range line-of-sight via highly directional antennas, or short-range 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 networking to allow laptops, PDAs, printers, and digital cameras to exchange data.
Sonic, especially "ultrasonic short range communication involves the transmission and reception of sound.
"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.
Common examples of wireless equipment include:
- 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 including FRS "Family Radio Service, GMRS (General Mobile Radio Service) and Citizens band ("CB") radios.
- The "Amateur Radio Service (Ham radio).
- Consumer and professional "Marine VHF radios.
- "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 (GPS): allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth.
- 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 or "Bluetooth
- "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.
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 in the USA, or "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 communication spans the spectrum from 9 kHz to 300 GHz.["citation needed]
One of the best-known examples of wireless technology is the "mobile phone, also known as a cellular phone, with more than 4.6 billion mobile cellular subscriptions worldwide as of the end of 2010. 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.
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, and in some circumstances users employ multiple connection types and switch between them using connection manager software or a "mobile VPN to handle the multiple connections as a secure, single "virtual network. Supporting technologies include:
- Wi-Fi is a wireless "local area network that enables portable computing devices to connect easily with other devices, peripheries, and the "Internet. Standardized as "IEEE 802.11 a,b,g,n, "Wi-Fi approaches speeds of some types of wired "Ethernet. Wi-Fi has become the de facto standard for access in private homes, within offices, and at public hotspots. Some businesses charge customers a monthly fee for service, while others have begun offering it for free in an effort to increase the sales of their goods.
- Cellular data service offers coverage within a range of 10-15 miles from the nearest "cell site. Speeds have increased as technologies have evolved, from earlier technologies such as "GSM, "CDMA and "GPRS, to "3G networks such as W-CDMA, "EDGE or "CDMA2000.
- Mobile Satellite Communications may be used where other wireless connections are unavailable, such as in largely rural areas or remote locations. "Satellite communications are especially important for "transportation, "aviation, "maritime and "military use.
- 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
Wireless data communications are used to span a distance beyond the capabilities of typical cabling in "point-to-point communication or "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.
Periphery devices in computing can also be connected wirelessly as part of a Wi-Fi network or directly by optical infer-red, "Bluetooth or "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. 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.
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.
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.
Categories of implementations, devices and standards
- "Radio station in accordance with "ITU "RR (article 1.61)
- "Radiocommunication service in accordance with ITU RR (article 1.19)
- "Radio communication system
- "Land Mobile 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 microphones, "Remote controls, "IrDA, "RFID (Radio Frequency Identification), "TransferJet, "Wireless USB, "DSRC (Dedicated Short Range Communications), "EnOcean, "Near Field Communication
- "Wireless sensor networks: "ZigBee, "EnOcean; "Personal area networks, "Bluetooth, "TransferJet, "Ultra-wideband (UWB from "WiMedia Alliance).
- "Wireless networks: "Wireless LAN (WLAN), ("IEEE 802.11 branded as "Wi-Fi and "HiperLAN), Wireless Metropolitan Area Networks (WMAN) and ("LMDS, "WiMAX, and "HiperMAN)
- "Comparison of wireless data standards
- "Digital radio
- "Hotspot (Wi-Fi)
- "List of emerging technologies
- "Mobile (disambiguation)
- "Personal area network
- "Radio antenna
- "Radio resource management (RRM)
- "Terrestrial television
- "Timeline of radio
- "Tuner (radio)
- "Wireless access point
- "Wireless security
- "Wireless Wide Area Network (True wireless)
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