Cellular: A type of wireless communication that is most familiar to mobile phones users. It's called 'cellular' because the system uses many base stations to divide a service area into multiple 'cells'. Cellular calls are transferred from base station to base station as a user travels from cell to cell. (Bellis) History
* First concept introduced in 1947
* Incorporated technology from car phones
* Purely theoretical and no technology existed to support * Dr. Martin Cooper, a Researcher for Motorola is credited with inventing the first cellular phone * The First Cell Phone The first cell phone was named the DynaTAC8000X. It was created by Martin Cooper in 1984. It took over a decade to develop and $100 million. There were only about 2,000of these cell phones available to the public. * Weight- 2 pounds could store only 30 phone numbers. Battery needed to be charged for 10 hours. Talk time- 1 hour! The phone cost $3,995!! Uses
* Text messaging
* Entertainment Uses: Games, music (mp3 player), books (e-book), and digital television broadcast * Social Uses: phone call, text message, wireless internet (access to e-mail, social networking websites) * Organization Uses: calendar, finance manager, address book, storage for data * Hospital Uses: Used to view image (x-ray, MRI, etc). Means of communication between nurses and clinicians. * Museum Uses: audio guide is provided through cell phones. * Educational uses: mobile learning provides access to lectures and test preps. * Track the culprits, location of a person
* Cell Phones "revolutionized long distance calling", making it much more inexpensive for long distance communication. * Cell phone logs have also been helpful in court cases where they can be used as evidence. * Smart Phones aren't only used for communication, but for organizing schedules, jotting down notes, playing music, games, checking the weather, and other applications
How do mobile phones work?
Mobile phones and their base stations transmit and receive signals using electromagnetic waves (also referred to as electromagnetic radiation or fields, or radio waves). Electromagnetic radiation is emitted by many natural and man-made sources and plays a very important part in our lives.
All electromagnetic radiation consists of oscillating electric and magnetic fields and the frequency, for ν (nu), which is the number of times per second at which the waves oscillate, determines their properties and the use that can be made of them. Frequencies are measured in hertz or Hz, where 1 Hz is one oscillation per second,1 kHz or kilohertz is a thousand Hz, 1 MHz or megahertz is a million Hz, and 1 GHz or gigahertz is a thousand million Hz or 109 Hz. Frequencies between about 30 kHz and 300 GHz are widely used for telecommunication, including broadcast radio and television, and comprise the radiofrequency (RF) band. Cellular mobile phone services operate within the frequency ranges 872–960 MHz and 1710–1875 MHz. An RF wave used for radio communication is referred to as a carrier wave. The information it carries – speech, computer data, etc – has to be added to the carrier wave in some way, a process known as modulation. The information can be transmitted in either analog/ Digital form.
Mobile Net work
A mobile phone sends and receives information (voice messages, fax, computer data, etc) by Radio communication. Radiofrequency signals are transmitted from the phone to the nearest base station and incoming signals are sent from the base station to the phone at a slightly different frequency. Once the signal reaches a base station it can be transmitted to the main telephone network, either by telephone cables or by higher frequency (such as 13, 23 or 38 GHz) radio links between an antenna (eg dish) at the base station and another at a terminal connected to the main telephone network. These microwave radio links operate at rather low power and with narrow...
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