Multiplexing Techniques: A Comprehensive Overview, Lecture notes of Mobile Computing

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2019/2020

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Multiplexing : Introduction
Multiplexing is a technique in which, multiple simultaneous analog or digital signals are
transmitted across a single data link.
The concept behind it is very simple: Proper Resource Sharing and its Utilization.
It can be classified into four types. These are:
Multiplexing : Frequency Division Multiplexing(FDM)
In Frequency Division , the frequency dimension spectrum is split into bands of smaller
frequency.
FDM is used because of the fact that, a number of frequency band can work
simultaneously without any time constraint.
Frequency Division
Advantages of FDM
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Multiplexing : Introduction

 Multiplexing is a technique in which, multiple simultaneous analog or digital signals are

transmitted across a single data link.

 The concept behind it is very simple: Proper Resource Sharing and its Utilization.

 It can be classified into four types. These are:

Multiplexing : Frequency Division Multiplexing(FDM)

 In Frequency Division , the frequency dimension spectrum is split into bands of smaller

frequency.

 FDM is used because of the fact that, a number of frequency band can work

simultaneously without any time constraint. Frequency Division Advantages of FDM

 This concept is applicable on both analog signals as well as digital signals.

 Simultaneous signal transmission feature.

Disadvantages of FDM

 Less Flexibility.

 Bandwidth wastage is high and can be an issue.

For Example : Frequency Division Multiplexing can be used for radio station in a particular region as every radio station will have their own frequency and can work simultaneously without having any constraint of time.

Multiplexing : Time Division Multiplexing(TDM)

 Time Division is used for a particular amount of time in which the whole spectrum is

used.

 Time frames of same intervals are made such that the entire frequency spectrum can be

accessed at that time frame. Time Division Advantages of TDM

 Single user at a time.

 Less complex and more flexible architecture.

Disadvantages of TDM

 Difficult to implement.

For Example : ISDN(Integrated Service for Digital Network) telephonic service.

Advantages of SDM

 High Data transmission rate.

 Optimal Use of Time and Frequency bands.

Disadvantages of SDM

 Inference Problems.

 High inference losses.

For Example : GSM(Global Service For Mobile) Technology.