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Time Division Multiple Access


Posted by: computer science crazy
Created at: Tuesday 07th of April 2009 01:06:43 PM
Last Edited Or Replied at :Tuesday 07th of April 2009 01:06:43 PM
multiple access cards, multiple access cellular communication , multiple access ca corp, multiple access collision avoidance , multiple access corporation, multiple access channel , multiple access control, carrier sense multiple access collision detection , code division multiple access cdma, multiple access communications , Multiple Access, Access , Multiple, Division , Time, time division multiple access ,
a significant leap over the analog wireless service that was in place at the time, and it's chief benefit for carriers was that it used the available wireless spectrum much more efficiently than analog, allowing more phone calls to go through simultaneously. An additional benefit to carriers was that it virtually eliminated the criminal cell phone cloning that was popular at the time by encrypting the signal it's wireless signal.

The primary benefit for wireless users of the era was dramatically increased call quality over the scratchy, frequently garbled or under water sounds that analo..................[:=> Show Contents <=:]



Orthogonal Frequency Division Multiplplexing


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:17:56 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:17:56 AM
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ial purpose hardware performing the fast Fourier transform (FFT). Recent advances in VLSI technology enable making of high speed chips that can perform large size FFT at affordable price.

In the 1980s, OFDM has been studied for high speed modems, digital mobile communications and high density recording. One of the systems used a pilot tone for stabilizing carrier and clock frequency control and trellis coding was implemented. Various fast modems were developed for telephone networks.
In 1990s, OFDM has been exploited for wideband data communications over mobile radio FM channels, high bit ..................[:=> Show Contents <=:]



Time Division Multiple Access TDMA


Posted by: Computer Science Clay
Created at: Saturday 28th of February 2009 11:32:20 PM
Last Edited Or Replied at :Saturday 28th of February 2009 11:32:20 PM
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gy.TDMA was replaced by GSM to permit the use of advanced, data intensive features such as text messaging and picture messaging, and to allow an even more efficient use of bandwidth...................[:=> Show Contents <=:]



Frequency Division Multiple Access FDMA


Posted by: computer science crazy
Created at: Sunday 15th of February 2009 01:15:02 AM
Last Edited Or Replied at :Sunday 15th of February 2009 01:15:02 AM
FDMA, Access , Multiple, Division , Frequency,
tion its own unique radio channel. Division of a radio frequency into several channels by splitting the frequency band into distinct segments, which are assigned to various callers. This allows a single base station to serve many callers. For example, a typical AMPS network will have 832 channels spaced approximately 30 kilohertz apart. - Frequency Division Multiple Access, digital transmission technology that combines elements of TDMA and spread spectrum.

Frequency Division Multiple Access. A method allowing multiple carriers to share a single satellite transponder or range of frequencies..................[:=> Show Contents <=:]



Code Division Multiple Access CDMA


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:00:16 AM
Last Edited Or Replied at :Tuesday 07th of February 2012 04:35:55 AM
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chip rate) is chosen so that the bandwidth of the filtered signal is several times the bandwidth of the original signal.
A typical system might use multiple PN sequences. In addition, it might use repeated spreading codes of known lengths to ensure orthogonality between signals intended for different users. The channel assignment is essentially determined by the set of codes that are used for that particular link. Thus, the signal transmitted at any time in a logical channel is determined by:

* The frequency of operation for the base station
* The current symbol
* The specific orthogo..................[:=> Show Contents <=:]



Frequency Division Multiple Access FDMA


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:53:54 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:53:54 AM
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der by prior allocation of individual channels. Single Channel Per Carrier (SCPC) is an FDMA scheme in which the input data stream is used to modulate an RF (radio frequency) carrier and assign dedicated carrier frequency to each client.
Frequency Division Multiple Access system for cellular radio.
Frequency Division Multiple Access The analog communications technique that uses a common channel for communication among multiple users allocating unique time slots to different users.
The process of dividing bandwidth into multiple frequencies which can be shared out among base transceiver s..................[:=> Show Contents <=:]



Time Division Multiple Access TDMA


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:37:42 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:37:42 AM
TDMA, Access , Multiple, Division , Time, tdma project report ,
switched to the GSM digital standard.

TDMA was a significant leap over the analog wireless service that was in place at the time, and it's chief benefit for carriers was that it used the available wireless spectrum much more efficiently than analog, allowing more phone calls to go through simultaneously. An additional benefit to carriers was that it virtually eliminated the criminal cell phone cloning that was popular at the time by encrypting the signal it's wireless signal.

The primary benefit for wireless users of the era was dramatically increased call quality over the scratchy, freq..................[:=> Show Contents <=:]



wide band code division multiple access


Posted by: lini555
Created at: Monday 22nd of March 2010 12:00:34 AM
Last Edited Or Replied at :Wednesday 01st of June 2011 12:23:58 AM
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i want exactly on wide band code division multiple a..................[:=> Show Contents <=:]



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