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Encyclopedia > Wireless communication
This article is about wireless communication. For the more general article about wireless technology see wireless.
For the article on wireless networking see Wireless networking.

Wireless communication is the transfer of information over a distance without the use of electrical conductors or "wires".[1] The distances involved may be short (a few meters as in television remote control) or very long (thousands or even millions of kilometers for radio communications). When the context is clear the term is often simply shortened to "wireless". Wireless communications is generally considered to be a branch of telecommunications. To meet Wikipedias quality standards, this article or section may require cleanup. ... Wireless networks are telephone or computer networks that use radio as their carrier or physical layer. ... A wire is a single, usually cylindrical, elongated strand of drawn metal. ... Telecommunication involves the transmission of signals over a distance for the purpose of communication. ...

Contents

Wireless communication

Wireless is a term used to describe telecommunications in which electromagnetic waves (rather than some form of wire) carry the signal over part or the entire communication path. Common examples of wireless equipment in use today include:


· Cellular phones 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; keyboards and printers can also be linked to a computer via wireless.


· Cordless telephone sets: these are limited-range devices, not to be confused with cell phones.


· Satellite television: allows viewers in almost any location to select from hundreds of channels.


Wireless networking is used to meet a variety of needs. Perhaps the most common use is to connect laptop users who travel from location to location. Another common use is for mobile networks that connect via satellite. A wireless transmission method is a logical choice to network a LAN segment that must frequently change locations. The following situations justify the use of wireless technology:


· To span a distance beyond the capabilities of typical cabling.


· To avoid obstacles such as physical structures, EMI, or RFI.


· 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.


· To remotely connect mobile users or networks.


In this lesson we examine the basics of wireless communication starting with the electromagnetic spectrum, identifying the frequencies used in wireless communication. Then we will look at the actual signal and how data is placed on the frequency. At that point, we will look at the various limitations or challenges that may occur in a wireless network. Finally we will look at the various types of antennas that are being used and how proper placement can reduce the adverse affect on the environment.


Wireless communication involves

  • radio frequency communication.
  • microwave communication, for example long-range line-of-sight via highly directional antennas, or short-range communication.
  • infrared (IR) short-range communication, for example from remote controls or via IRDA.

Applications may involve point-to-point communication, point-to-multipoint communication, broadcasting , cellular networks and other wireless networks. Microwaves are electromagnetic waves with wavelengths longer than those of terahertz (THz) frequencies, but relatively short for radio waves. ... Image of two girls in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ... A television remote control A DVD player remote control A remote control is an electronic device used for the remote operation of a machine. ... The initials IRDA can refer to various things: In Information Technology and Communications, IrDA refers to Infrared Data Association, a standard for communication between devices (such as computers, PDAs and mobile phones) over short distances using infrared signals. ... This article or section does not cite its references or sources. ... This article or section does not adequately cite its references or sources. ... Wikibooks has more about this subject: Marketing Note: broadcasting is also a term for hand sowing. ... A cellular network is a radio network made up of a number of radio cells (or just cells) each served by a fixed transmitter, normally known as a cell site or base station. ... While the term wireless network may technically be used to refer to any type of network that is wireless, the term is most commonly use to refer to a telecommunications network whose interconnections between nodes is implemented without the use of wires, such as a computer network (which is a...

Image File history File links Information_icon. ... Shortcut: WP:A WP:A does not stand for Wikipedia:Administrators. ... Shortcut: WP:WIN Wikipedia is an online encyclopedia and, as a means to that end, also an online community. ...

Categories of wireless implementations, devices and standards


The Electromagnetic Spectrum Wikibooks has more about this subject: Marketing Note: broadcasting is also a term for hand sowing. ... Ham radio station with modern solid-state transceiver featuring LCD display and DSP capabilities Ham radio station with vintage vacuum tube gear featuring separate transmitter, receiver and power supply Amateur radio, often called Ham radio, is a hobby and public service enjoyed by about 6 million people throughout the world. ... See http://en. ... This article or section is not written in the formal tone expected of an encyclopedia article. ... 0G refers to pre-cellular mobile telephony technology. ... 1G (or 1-G) is short for first-generation wireless telephone technology, cellphones. ... This article or section does not cite its references or sources. ... It has been suggested that Evolution to 3G be merged into this article or section. ... This article is about the mobile phone standard. ... Invented by Hung C. Lin, the first wireless microphone went into production in 1962, called the transistophone and put out by the German equipment manufacturer beyerdynamic. ... A television remote control A DVD player remote control A remote control is an electronic device used for the remote operation of a machine. ... The Infrared Data Association (IrDA) defines physical specifications communications protocol standards for the short range exchange of data over infrared light, for uses such as personal area networks (PANs). ... An EPC RFID tag used for Wal-Mart Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. ... Wireless USB is a short-range, high-bandwidth wireless extension to USB that combines the speed and ease-of-use of USB 2. ... DSRC or Dedicated Short Range Communications is a short to medium range wireless protocol specifically designed for automotive use. ... A wireless sensor network (WSN) is a wireless network consisting of spatially distributed autonomous devices using sensors to cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion or pollutants, at different locations. ... ZigBee is the name of a specification for a suite of high level communication protocols using small, low-power digital radios based on the IEEE 802. ... Bluetooth logo Bluetooth is an industrial specification for wireless personal area networks (PANs). ... Ultra-wideband (also UWB, and ultra-wide-band, ultra-wide band, etc. ... The WiMedia Alliance is a not-for-profit open industry association that promotes and enables the rapid adoption, regulation, standardization and multi-vendor interoperability of ultra-wideband (UWB) worldwide. ... Wireless networks are telephone or computer networks that use radio as their carrier or physical layer. ... IEEE 802. ... Wi-Fi (or Wi-fi, WiFi, Wifi, wifi), short for Wireless Fidelity, is a set of standards for wireless local area networks (WLAN) currently based on the IEEE 802. ... HIPERLAN (HIgh PErformance Radio LAN) is a Wireless LAN standard. ... Local Multipoint Distribution Service is a broadband wireless access technology, operating between the 26GHz and 29GHz bands. ... It has been suggested that this article or section be merged with IEEE 802. ... HIPERMAN stands for High Performance Radio Metropolitan Area Network and is a standard created by the European Telecommunications Standards Institute (ETSI) Broadband Radio Access Networks (BRAN) group to provide a wireless network communication in the 2 - 11 GHz bands across Europe and other countries which follow the ETSI standard. ...


We are all affected by the Electromagnetic Spectrum in our daily lives. Light, colors, AM and FM radio, broadcast TV, microwaves, portable phones, cell phones, satellite TV and, yes, even your wireless laptop, all work on the Electromagnetic Spectrum.


In the US the frequencies that are available for use for communication are treated as a public resource and are regulated by the Federal Communications Commission (FCC). This is a very important role because it determines which frequency ranges can be used for what purpose and by whom. This may sound very controlled, but just imagine the chaos if, for example, airlines didn't have specific frequencies to work under and some ham radio buff was interfering with the pilots ability to land an airplane.


Wireless communication spans the spectrum from 9 KHz to 300 GHz. It must be remembered that the airwaves are a spectrum. This means frequencies close to each other can interfere with each other if not regulated properly. Medical equipment and cell phones are not a very good mix and that is why cell phone use is banned in hospitals and doctors offices.


See also

This article needs to be cleaned up to conform to a higher standard of quality. ... Radio resource management (RRM) is the system level control of radio transmission characteristics in wireless communication systems, for example cellular networks, wireless networks and broadcasting systems. ... True wireless refers to WWAN connectivity. ... Hotspots are locations where you can have access from mobile computers (such as a laptop or a PDA) without connection cables to networked services such as the internet. ... It has been suggested that Power beaming be merged into this article or section. ... Wireless networks are very common, both for organizations and individuals. ... A personal area network (PAN) is a computer network used for communication among computer devices (including telephones and personal digital assistants) close to one person. ...

References

  1. ^ The SINTEF Group, The Foundation for Scientific and Industrial Research at the Norwegian Institute of Technology

External links

  • Wireless Communication with an Example
Wikibooks
Wikibooks has a book on the topic of
Nets, Webs and the Information Infrastructure

Image File history File links Wikibooks-logo-en. ... Wikibooks logo Wikibooks, previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks, is a wiki for the creation of books. ...

Patents

  • U.S. Patent 1642420 , S. Loewe, "Wireless Receiving Apparatus"
  • U.S. Patent 1754875 , E. E. Clement, "Radiophone desk set"

General

  • WLAN Central Wireless and WiFi news resource
  • Wireless Daily Latest Wireless News and Blog

  Results from FactBites:
 
WIRELESS COMMUNICATIONS: A MODERN NECESSITY (2699 words)
Consequently, wireless providers may be regulated according to 23 Code of Federal Regulations 1.23 (b) and (c) under the air space provisions, unless state statute defines wireless communications as a public utility.
The wireless communications needs of the public are served; the fielding of some intelligent transportation systems is facilitated; and future highway improvements are funded by the additional income received by the state highway agency.
However, available wireless communications systems that currently serve urban areas may not be fully suitable for application to rural areas due to limitations in coverage, transmission rate, and so forth.
An Investigation of the Safety Implications of Wireless Communications in Vehicles DOT TOC (7721 words)
In addition, the safety benefits of having a communications capability available within a vehicle are well documented and supported by both law enforcement and consumer safety groups, which frequently promote the use of these devices to ensure the security of the driver as well as to report congestion, crashes, and drunk drivers.
The objective of this effort is thus to assess the current state of knowledge regarding the safety implications of using wireless communication while driving a motor vehicle and to explore the broader safety issues associated with such use.
While voice communication has been the primary focus of the cellular industry, recent technological and societal trendsandemdash;in mobile communications and computer hardware and software (e.g., size, flexibility, connectivity), and the desire to "work on-the-road" have resulted in a move towards integration of technologies.
  More results at FactBites »

 
 

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