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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
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it's wireless signal.

The primary bene..................[:=> 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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tion and demodulation process. In addition to eliminating the banks of subcarrier oscillators and coherent demodulators required by FDM, a completely digital implementation could be built around special 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 ..................[:=> 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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as 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 become accustomed to. All manufacturers produced TDMA handsets during this period of time, but Nokia's ubiqui..................[:=> 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,
ith 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 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 shar..................[:=> 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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r's signal is pseudo-orthogonal to the signals of the other users.

CDMA Signals
In a CDMA system, each signal consists of a different pseudorandom binary sequence (called the spreading code) that modulates a carrier, spreading the spectrum of the waveform. A large number of CDMA signals share the same frequency spectrum. If CDMA is viewed in either the frequency or time domain, the multiple access signals overlap with each other. However, the use of statistically orthogonal spreading codes separates the various signals in the code space.

CDMA Receivers
A CDMA receiver separates the 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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els 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. The transponder bandwidth is divided into sub-channels, each of which is allocated to a particular earth station (carrier). The earth stations transmit continuously and the transponder conveys several carriers simultaneously at different frequencies.

A method employed to permit several u..................[:=> 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 ,
r water sounds that analog users had become accustomed to. All manufacturers produced TDMA handsets during this period of time, but Nokia's ubiquitous model 5165 is probably the most popular example of..................[:=> 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 cod..................[:=> Show Contents <=:]



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