DQPSK transmitter : complex multiplication

Discussion in 'VHDL' started by Patrick, Nov 26, 2004.

  1. Patrick

    Patrick Guest

    Hello everybody,

    Does anyone knows how to produce the DQPSK mapping at the
    transmitter...

    I use for DBPSK : DBPSK_Out = data XOR DBPSK_out_previous

    And at the receiver I used the following complex multiplication :
    Dot = I(k).I(k-1) + Q(k).Q(k-1)

    What is the mapping for the DQPSK encoding
    I will use Dot and Cross = I(k-1).Q(k)-I(k).Q(k-1) at the receiver to
    demodulate the DQPSK datas...

    Thanks for help...
     
    Patrick, Nov 26, 2004
    #1
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  2. Patrick

    Jerzy Guest

    > Does anyone knows how to produce the DQPSK mapping at the
    > transmitter...
    >
    > I use for DBPSK : DBPSK_Out = data XOR DBPSK_out_previous
    >
    > And at the receiver I used the following complex multiplication :
    > Dot = I(k).I(k-1) + Q(k).Q(k-1)
    >
    > What is the mapping for the DQPSK encoding
    > I will use Dot and Cross = I(k-1).Q(k)-I(k).Q(k-1) at the receiver to
    > demodulate the DQPSK datas...


    I think that DOT != CROSS

    Maybe I could help, but I don't understand your last sentence.

    Jerzy Gbur
     
    Jerzy, Nov 30, 2004
    #2
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