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What Is The Differentiate Between Cdma And Fdma ?

Answer»

CDMA and FDMA 

CDMA : 

  • Same frequency is used by every user and simultaneous transmission occurs
  • Every narrowband signal is multiplied by wideband spreading signal, usually KNOWN as codeword
  • Every user has a separate pseudo-codeword, i.e., orthogonal to others
  • Only the desired codeword is detected by the receivers and others appear as NOISE
  • It is MANDATORY for the receivers to know about the transmitter’s codeword

FDMA :

  • When the channel is not in use, it sits simply idle.
  • Bandwidth of Channel is relatively narrow (30 KHz), known as narrowband system.
  • Little or no equalization is NEEDED for spreading symbol time.
  • Analog links are suitable for FDMA.
  • Framing or synchronization bits are not needed for CONTINUOUS transmission.
  • Tight filtering is needed to minimize interference.

CDMA and FDMA 

CDMA : 

FDMA :


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