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Visitor kirancshet
Visitor
5,015 Views
Registered: ‎03-20-2011

DQPSK Modulation

Hello Everyone,

 

I am trying to model  DQPSK modulator using Xilinx blockset in Simulink. I was successful in modelling a QPSK modulator.

 

Here is the Model for QPSK Modulation : 

 

QPSK_Sig.jpg

 

So, I need to now implement the DQPSK modulator. Here is the equivalent matlab code : 

 

 

for i=1:length(Symbol)

        Phase=exp(1j*qpsk_encode(Symbol(i)+1)+Theta);

        if(i==1)
            DQPSK_Sig(i)=Phase*LastTxSymbol;
        else
            DQPSK_Sig(i)=DQPSK_Sig(i-1)*Phase;
        end
        
         if(DQPSK_Sig(i)>2*pi)
            DQPSK_Sig(i)= DQPSK_Sig(i)-2*pi;
        end
    end

 

Any suggestion, how to model it in simulink would be highly appreciated.

 

Thanks

Kiran

 

 

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