| Analog Service is similar to FM radio in
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| | technology this technology was restricted
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| that modulating radio signals carry
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| | to military use and top secret during
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| information such as voice or data. The
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| | World War 2. In the 1980's the commercial
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| receiver and transmitter must be tuned to
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| | use of this technology was realized after
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| the same frequency within a small band
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| | a 1976 publication of Spread Spectrum
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| width for the receiver to rebuild the
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| | Systems by Robert Dixon was published.
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| signal, amplify it, and send it to the
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| | Previous publications were classified
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| speaker. There are limitations on the
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| | military reports or narrow subtopics on
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| number of channels that can be used
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| | academic papers. By 1993 CDMA was
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| making this technology soon to be
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| | accepted as a standard and went into
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| outlived. Effective February 2008, many
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| | operation in 1996. CDMA also exists at
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| wireless providers will be discontinuing
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| | both the 800 MHz and 1900 MHz band, and
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| support of this service.
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| | is used by the major carriers.
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| Digital Service is a method similar to
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| | GSM (Global System for Mobile
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| computers, in that it uses binary code of
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| | Communications) is based upon an improved
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| Os and 1s. Most new wireless phones and
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| | version of TDMA technology. In 1982, a
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| networks use digital technology. The
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| | conference in Europe created a digital
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| analog signal in Digital is converted
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| | standard to allow users to roam from
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| into binary code and transmitted as a
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| | country to country in Europe. By 1987,
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| series of on and off transmissions. There
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| | the GSM standard was created based upon
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| are three digital wireless technologies,
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| | both analog and TDMA digital
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| CDMA, TDMA and GSM and I will explain
| |
| | technologies. Using wider 200 kHz
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| these three as phones that work with one
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| | channels instead of the 30 kHz channels
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| may not work on another.
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| | TDMA used along with other modifications
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| TDMA (Time Division Multiple Access) was
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| | they were able to speed up the bit rate
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| released in 1994; it uses the frequency
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| | with a more natural sounding
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| bands available to the wireless network
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| | voice-compression algorithm. This also
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| and divided them into time slots with
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| | enabled GSM to provide such other data
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| each phone user having access to one time
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| | services as email, fax, internet
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| slot at regular intervals. In North
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| | browsing, and internet/LAN wireless
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| America TDMA uses both 800 MHz and 1900
| |
| | access. The GSM standard was accepted in
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| MHz bands. Most of the major wireless
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| | the United States in 1995 and is the only
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| carriers use TDMA.
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| | phone that can be used around the world.
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| CDMA (Code Division Multiple Access)
| |
| | This technology will be the bases of
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| technology dates back to the 1940's, when
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| | future growth in the wireless phone
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| it was developed for military use because
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| | industry as it offers the multifunction
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| it was resistant to interference from
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| | capabilities today's users require.
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| enemy signals. Known as spread spectrum
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| |
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