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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 ,
nt 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 analog users had ..................[:=> 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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. It has found immense applications in communication systems. This report is intended to provide a tutorial level introduction to OFDM Modulation, its advantages and demerits, and some applications of OFDM.

History Of OFDM
The concept of using parallel data transmission by means of frequency division multiplexing (FDM) was published in mid 60s. Some early development can be traced back in the 50s. A U.S. patent was filled and issued in January, 1970. The idea was to use parallel data streams and FDM with overlapping sub channels to avoid the use of high speed equalization and to combat imp..................[:=> 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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ven 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,
nnels. A full duplex conversation requires a transmit & receive channel pair. For example, if a FDMA system had 200 channels, the system could handle 100 simultaneously full duplex conversations. (100 channels for transmitting and 100 channels for receiving) Example: FDMA channel With FDMA users share the transponder 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 f..................[:=> 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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tio of the desired signal. This ratio is also known as the processing gain. The signal-to-noise ratio is determined by the ratio of the desired signal power to the sum of all of the other signal powers. It is enhanced by the processing gain or the ratio of spread bandwidth to baseband data rate.

CDMA Channel Assignments
A CDMA digital cellular waveform design uses a pseudorandom noise (PN) sequence to spread the spectrum. The sample rate of the spreading sequence (called the chip rate) is chosen so that the bandwidth of the filtered signal is several times the bandwidth of the original sig..................[:=> 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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ed out among base transceiver stations (BTS)within the network...................[:=> 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 ,
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 analog users had become accustomed to. All manufacturers produced TDMA handsets during this period of time, but Nokia's ubiquitous mod..................[:=> 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..................[:=> Show Contents <=:]



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