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01-06-2017, 09:42 AM

Wireless teleom systems and networks,mullet:Thomson Learning 2006

jaseela123d · 02-06-2017, 09:43 AM

Wireless communication, or simply simply wireless, is the transfer of information or energy between two or more points that are not connected by an electric conductor. The most common wireless technologies use radio waves. With radio waves the distances can be short, such as a few meters for television [clarification needed] or even thousands or even millions of kilometers for deep space radio communications. It covers various types of fixed, mobile and portable applications, including bi-directional radios, cell phones, personal digital assistants (PDAs) and wireless networks. Other examples of radio wireless technology applications include GPS units, garage door openers, wireless mice, keyboards and headphones, headphones, radio receivers, satellite television, television and cordless phones.

Some 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 the history of communications, with a slightly different meaning. It was initially used since 1890 for the first radio transmission and reception technology, as in wireless telegraphy, until the new word radio replaced it around 1920. The term was revived in the 1980s and 1990s primarily to distinguish digital devices that Are communicated wirelessly, such as the examples listed in the previous paragraph, of those requiring cables or cables. This became its main use in the 2000s, due to the arrival of technologies such as LTE, LTE-Advanced, Wi-Fi and Bluetooth.

Wireless operations allow services, such as long-range communications, that are impossible or impossible to implement with the use of cables. The term is commonly used in the telecommunications industry to refer to telecommunication systems (eg radio transmitters and receivers, remote controls, etc.) that use some form of energy (eg, radio waves, acoustic energy) To transfer information without the use of cables. The information is transferred in this way over short and long distances.

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