Multiplexing in Mobile Computing

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 : Mobile Computing

 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.

Multiplexing : Code Division Multiplexing(CDM)

  • In Code Division Multiplexing, every channel is allotted with a unique code so that each of these channels can use the same spectrum simultaneously at same time.

Code Division

Advantages of CDM

  • Highly Efficient.
  • Less Inference.

Disadvantages of CDM

  • Less data transmission rates.
  • Complex in nature.

For Example : Cell Phone Spectrum Technology(2G, 3G etc.).

Multiplexing : Space Division Multiplexing(SDM)

  • Space Division can be called as the combination of concepts of Frequency Division Multiplexing and Time Division Multiplexing.
  • In SDM, the goal is to pass messages or data parallelly with the use of specific frequency at certain interval of time.
  • It means, a particular channel for some amount of time will be used against a certain frequency band.

 Advantages of SDM

  • High Data transmission rate.
  • Optimal Use of Time and Frequency bands.

Disadvantages of SDM

  • Inference Problems.
  • High inference losses.

Related Posts

Comments are closed.

© 2024 Basic Computer Science - Theme by WPEnjoy · Powered by WordPress