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Code Division Multiplexing

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• Code Division Multiplexing
  • We saw in the previous example that:

    Multiple transmissions (= collision) can be decoded correctly using Direct Sequence Spread Spectrum technique BTW, this does not come for free The bandwidth used to transmit 1 bit in DSSS is N times higher (N = the chip length)

    Therefore:

    Direct Sequence Spread Spectrum (DSSS) can allow multiple sender/receiver to share the broadcast transmission medium

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  • Code Division multiplexing (CDM):

    Code Division Multiplexing (CDM) = sharing a broadcast transmission medium using PN code transmission

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  • Recall we have learn 2 medium sharing techniques previously:

    Time Division Multiplexing (TDM) Frequency Division Multiplexing (FDM)

    CDM is the third way to share a transmission medium