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Multiplexing techniques

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Abdurrhman Alzahrani

on 11 May 2014

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Transcript of Multiplexing techniques

Code division multiplexing (CDM)
Wave Division Multiplexing
Time Division Multiplexing

In wired communication, space-division multiplexing (SDM) simply implies different point-to-point wires for different channels. Examples include an analogue stereo audio cable, with one pair of wires for the left channel and another for the right channel, and a multipair telephone cable.
Wave or Wavelength Division Multiplexing (WDM) is used with fibre optic cables. WDM is a technology that closely resembles frequency division multiplexing, but is specifically used to combine lots of Optical Carrier signals into a single optical fibre.
Old but now new method
Also known as code division multiple access (CDMA)
An advanced technique that allows multiple devices to transmit on the same frequencies at the same time using different codes

Time-division multiplexing (TDM) is a digital (or in rare cases, analog) technology which uses time, instead of space or frequency, to separate the different data streams .
Time division multiplexing comes in two basic forms:
1. Synchronous time division multiplexing, and
2. Statistical, or asynchronous time division multiplexing
Frequency Division Multiplexing
Frequency-division multiplexing (FDM) is inherently an analog technology. FDM achieves the combining of several signals into one medium by sending signals in several distinct frequency ranges over a single medium.
One of FDM's most common applications is the old traditional radio and television broadcasting from terrestrial, mobile or satellite stations .

In telecommunications and computer networks, multiplexing (sometimes abbreviated to muxing) is a method by which multiple analogue message signals or digital data streams are combined into one signal over a shared medium. The aim is to share an expensive resource. For example, in telecommunications, several telephone calls may be carried using one wire. Multiplexing originated in telegraphy in the 1870s, and is now widely applied in communications
The current techniques that can accomplish this include
1. Space-division multiplexing (SDM)
2.Frequency division multiplexing (FDM)
3.Time division multiplexing (TDM)
synchronous & statistical
4.Wavelength division multiplexing (WDM)
5.Code division multiplexing (CDM)

Multiplexing techniques
#Multiplexor (MUX)
#Demultiplexor (DEMUX)
Sometimes just called a MUX
#Two or more simultaneous transmissions on a single
Transparent to end user.
#Multiplexing costs less.

Multiplexing cont...

Each mobile device is assigned a unique 64-bit code (chip spreading code)
To send a binary 1, mobile device transmits the unique code
To send a binary 0, mobile device transmits the inverse of code

Code Division Multiplexing coun...
Space-division multiplexing
TDM works by the muliplexor giving exactly the same amount of time to each device connected to it.

TDM is a more flexible method of TDM. With Asynchronous TDM the length of time allocated is not fixed for each device but time is given to devices that have data to transmit.

Advantages and disadvantaages of multiplexing techniques
Multiplexing Technique



Frequesncy Division

-Analog signals only

-popular with radio,TV,cable TV
-Limited by frequency ranges

-All the receivers, such as cellular

telephones, don't need to be at

the same location

Synchronous Time

-Digital signals
-Wastes bandwidth

-Rleatively simple

-Commonly used with T-1
Statistical Time

-More efficient use of bandwidth
-More complex than

-Packets can be various sizes
synchronous time division

-Frame can contain control
Dense Wavelength

-Very high capacities over fiber


-Signal can have varying speeds

Code Division

-Large capacities

Space Division

-Not requiring any muxing

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