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NTC 362 Week 4 Learning Team Assignment- Hardware and Software Paper

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Running head: TIME DIVISION MULTIPLE ACCESS,FREQUENCY
1
Time Division Multiple Access, Frequency Division, Multiple Access, and Orthogonal
Frequency Division Multiplexing
NTC362
Daniel Aldama
.

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TIME DIVISION MULTIPLE ACCESS,FREQUENCY
2
Frequency Division Multiple Access
As the name implies, Frequency Division Multiple Access (FDMA), utilizes
Frequency Division Modulation (FDM) to separate the given spectrum into individual
analog bands or channels. A simplified view of how this is done can be seen in figure 1
below. Each of these channels is then able to facilitate communication for a single user.
According to (Goleniewski, 2007) each FDMA cell is able to facilitate about 60 users,
which is very a low number by current standards.
Figure 1. Goleniewski, L. (2007). Example of FDMA channel separation.
FDMA was short lived as a viable option for commercial use on its own; however,
it was an important step in the right direction. I say this because it is now a critical part
of multiple other techniques, where it is used to divide spectrum into channels before
other modulation techniques are applied. Once such technology is the one explained
next.

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TIME DIVISION MULTIPLE ACCESS,FREQUENCY
3
Time Division Multiple Access
Time Division Multiple Access or TDMA is a channel access that is shared out
and is used on medium networks. This is also known as the 2G network that is slowly
being phased out. What TDMA does is it allows multiple users to share the same
channel within a network. This is accomplished by splitting a single channeling into two
or three different time slots to maximize the data flow. The communication then can take
place by allowing the users communication to pass through the channel at different
intervals. When the communication is picked up on the other end the intervals are
reconstructed as if each user was using a single line by themselves. This
communication technology is used in the cell phone industry. “DMA is used by Digital-
American Mobile Phone Service (D-AMPS), Global System for Mobile communications
(GSM), and Personal Digital Cellular (PDC)” (Time division multiple). Since TDMA
cannot be used in the exact same way these companies have to implement it in
different ways. There are many advantages to using this system and here are a few of
them:
o TDMA can easily adaptable
o TDMA provides users with an extended battery life
o TDMA is the most cost effective
Since TDMA is use a split channel it can be easily adapted to not only data
transmissions, but voice communications as well. This is a great feature because
anything that can do two things is going to be an asset. Having that ability to adapt on
the fly without flipping a switch can save time and money for a company. Having the

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