Write about Channel Access on links. Multiple Access Techniques Frequency Division Multiple Access

Write about Channel Access on links.
Multiple Access Techniques
Frequency Division Multiple Access
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1 Answer

Answer :

∙ In frequency-division multiple access (FDMA), the available bandwidth is divided into frequency  bands.  
∙ Each station is allocated a band to send its data.  
∙ When any one frequency level is kept idle and another is used frequently leads to inefficiency.  Time Division Multiple Access
∙ In time-division multiple access (TDMA), stations share the bandwidth of the channel in time.  ∙ Each station is allocated a time slot during which it can send data.  
∙ The main problem with TDMA lies in achieving synchronization between the different stations.   Code Division Multiple Access
∙ CDMA differs from FDMA because only one channel occupies the entire bandwidth of the link.  ∙ It differs from TDMA because all stations can send data at the same time without timesharing.  ∙ CDMA simply means communication with different codes.  
∙ CDMA is based on coding theory. Each station is assigned a code, which is a sequence of numbers  called chips.  
∙ Chips will be added with the original data and it can be transmitted through same
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