Correct Answer - Option 4 : Provide better signal-to-noise ratio
TDM (Time Division Multiplexing):
It is a multiplexing technique that allows the transmission of multiple signals over a common channel but in different time slots.
Each signal will get transmitted very quickly over the channel but at a time only one signal will be transmitted.
FDM (Frequency Division Multiplexing):
It is also a multiplexing technique like TDM, in which multiple transmitted signals use a common channel but the total available bandwidth is utilized among the various signals.
This implies that over a complete channel a particular frequency slot is allotted to only one signal.
In FDM, a different frequency band is used to modulate different data signals. This means that different carrier frequency modulates the various signals that are to be transmitted over the channel.
Key differences between FDM and TDM:
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FDM
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TDM
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It is used in Analog signal transmission
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It is used in Digital signal transmission
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In FDM the signals are allotted different frequency slots, this leads to the possibility of crosstalk while signal transmission.
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In TDM multiple signals are transmitted in different time domains, thus the chances of crosstalk between the signals are negligible
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Signal-Noise ratio is higher
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Provide better Signal-Noise ratio
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Synchronization is not needed
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Synchronization is necessary
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Circuit orientation is quite complex
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Circuit orientation is comparatively simple.
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Costlier
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Comparatively less
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FDM offers low efficiency because the technique is more prone to cause interference while transmission.
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TDM is highly efficient because the chances of interference are less in its case.
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No propagation delay
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Propagation delays are present
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