CHANNEL CODING

CDMA Glossary

CDMA — Channel Coding

 

 

 

 

 

 

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Information on Channel Coding

Channel coding is the technique of protecting message signals from signal impairments by adding redundancy to the message signal. In a communications system, error control is necessary for messages that require high reliability, or if the transmission medium is prone to error. Messages requiring high reliability include data with no internal redundancy, control signals, and voice or video signals that have undergone efficient source coding.
     Channel coding in CDMA operates by applying a half-rate convolutional code to the input data, and interleaving the output. The interleaving used in CDMA:
    

  • spreads burst errors (due to Raleigh fading) over a longer period, reducing the reduce peak bit error rate, and

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  • allows the channel coding to correct the (now) randomly spaced bit errors.


    • Other topics in our resources on CDMA related to Channel Coding include: 
     
  • convolutional coding
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