DEFINITION OF WIRELESS
Wireless communication is the transfer of information over a distance without the use of electrical conductors or "wires". 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.
It encompasses various types of fixed, mobile, and portable two way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, garage door openers and or garage doors, wireless computer mice and keyboards, satellite television and cordless telephones.
Wireless communication is the transfer of information over a distance without the use of electrical conductors or "wires". 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.
It encompasses various types of fixed, mobile, and portable two way radios, cellular telephones, personal digital assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, garage door openers and or garage doors, wireless computer mice and keyboards, satellite television and cordless telephones.
WHAT IS WIRELESS COMMUNICATION?
Wireless is an old-fashioned term for a radio transceiver (a mixed receiver and transmitter device), referring to its use in wireless telegraphy early on, or for a radio receiver. Now the term is used to describe modern wireless connections such as those in cellular networks and wireless broadband Internet.In modern usage, wireless is a method of communication that uses low-powered radio waves to transmit data between devices. The term refers to communication without cables or cords, chiefly using radio frequency and infrared waves. Common uses include the various communications defined by the IrDA, the wireless networking of computers and cellular mobile phones.High powered transmission sources usually require government licenses to broadcast on a specific wavelength. This broadcast platform which has historically carried voice and music, has grown into a large industry, with many thousands of broadcasts around the world.Low-powered radio waves, such as those used in networking to transmit data between devices, are often unregulated. Wireless is now increasingly being used by unregulated computer users. Optimal bandwidth routing within wireless networks requires the calculation in real-time of the best way to direct traffic.Software and hardware developers are creating smaller computer networks which form ad-hoc wireless network, with protocols such as WiFi and ZigBee. The IEEE 802.11 standard is for wireless, Ethernet-like LANs. The insecurities in this protocol have popularized the concept of war driving.
Wireless is an old-fashioned term for a radio transceiver (a mixed receiver and transmitter device), referring to its use in wireless telegraphy early on, or for a radio receiver. Now the term is used to describe modern wireless connections such as those in cellular networks and wireless broadband Internet.In modern usage, wireless is a method of communication that uses low-powered radio waves to transmit data between devices. The term refers to communication without cables or cords, chiefly using radio frequency and infrared waves. Common uses include the various communications defined by the IrDA, the wireless networking of computers and cellular mobile phones.High powered transmission sources usually require government licenses to broadcast on a specific wavelength. This broadcast platform which has historically carried voice and music, has grown into a large industry, with many thousands of broadcasts around the world.Low-powered radio waves, such as those used in networking to transmit data between devices, are often unregulated. Wireless is now increasingly being used by unregulated computer users. Optimal bandwidth routing within wireless networks requires the calculation in real-time of the best way to direct traffic.Software and hardware developers are creating smaller computer networks which form ad-hoc wireless network, with protocols such as WiFi and ZigBee. The IEEE 802.11 standard is for wireless, Ethernet-like LANs. The insecurities in this protocol have popularized the concept of war driving.
HISTORY OF WIRELESS
The term "Wireless" came into public use to refer to a radio receiver or transceiver (a dual purpose receiver and transmitter device), establishing its usage in the field of wireless telegraphy early on; now the term is used to describe modern wireless connections such as in cellular networks and wireless broadband Internet. It is also used in a general sense to refer to any type of operation that is implemented without the use of wires, such as "wireless remote control", "wireless energy transfer", etc. regardless of the specific technology (e.g., radio, infrared, ultrasonic, etc.) that is used to accomplish the operation.
Early wireless work
David E. Hughes, eight years before Hertz's experiments, induced electromagnetic waves in a signaling system. Hughes transmitted Morse code by an induction apparatus. In 1878, Hughes's induction transmission method utilized a "clockwork transmitter" to transmit signals. In 1885, T. A. Edison uses a vibrator magnet for induction transmission. In 1888, Edison deploys a system of signaling on the Lehigh Valley Railroad. In 1891, Edison attains the wireless patent for this method using inductance (U.S. Patent 465,971 ).
In the history of wireless technology, the demonstration of the theory of electromagnetic waves by Heinrich Rudolf Hertz in 1888 was important. The theory of electromagnetic waves were predicted from the research of James Clerk Maxwell and Michael Faraday. Hertz demonstrated that electromagnetic waves could be transmitted and caused to travel through space at straight lines and that they were able to be received by an experimental apparatus. The experiments were not followed up by Hertz and the practical applications of the wireless communication and remote control technology would be implemented by Nikola Tesla.
APPLICATIONS OF WIRELESS TECHNOLOGY
Security systems
Wireless technology may supplement or replace hard wired implementations in security systems for homes or office buildings.
Television remote control
Modern televisions use wireless (generally infrared) remote control units. Now we also use radio waves.
Cellular telephony (phones and modems)
Perhaps the best known example of wireless technology is the cellular telephone and modems. These instruments use radio waves to enable the operator to make phone calls from many locations world-wide. They can be used anywhere that there is a cellular telephone site to house the equipment that is required to transmit and receive the signal that is used to transfer both voice and data to and from these instruments.
WiFi
Wi-Fi is a wireless technology widely used between personal computers and similar gadget.
Wireless technology may supplement or replace hard wired implementations in security systems for homes or office buildings.
Television remote control
Modern televisions use wireless (generally infrared) remote control units. Now we also use radio waves.
Cellular telephony (phones and modems)
Perhaps the best known example of wireless technology is the cellular telephone and modems. These instruments use radio waves to enable the operator to make phone calls from many locations world-wide. They can be used anywhere that there is a cellular telephone site to house the equipment that is required to transmit and receive the signal that is used to transfer both voice and data to and from these instruments.
WiFi
Wi-Fi is a wireless technology widely used between personal computers and similar gadget.
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