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Help required with DSK6713

Ameya Chikramane
Prodigy 20 points

Hi, I am trying to implement an OFDM model on DSK6713.

Data is generated within the DSK and is being transmitted through the DAC at 44.1khz. This is being received by the Line in and received. ie: Transmitter and receiver are implemented on the same DSK( to avoid sync. problems)

My problem is:

1) The data sent to the DAC and received by ADC is not the same even when they are directly connected externally. ( The data is checked using RTDX channels in the GPDPROG application.

2) Output of the viterbi decoder is always zero.

I have attached the code. Please help me figure this out!

  • 0
    Expert 2655 points

    Greetings,

    Since you are using Matlab/Simulink with RTW, I suggest you create a plain loop back sine wave generator project where you generate the sinusoid, send to DAC, loop it back to ADC and view what you get back in Simulink scope.  This will exercise the library functions used in Simulink, and ascertain their fitness to do your OFDM model.

    Good Luck,

    Sam

  • 0 in reply to Sam Kuzbary
    Prodigy 20 points

    Thankyou Sam,

    I tried a simple loop-back program. What ever i receive at the ADC is simply not the same thing i send to the DAC. I have ensured a uniform sample time throughout the model.

  • 0 in reply to Ameya Chikramane
    Expert 2655 points

    Greetings,

    I had good luck in the past using these library blocks in ERT mode.  I suggest then you just use the example models provided in Simulink Demos.  You may have a challenged DSK hardware.  I hope you have another one to try.

    Good Luck,

    Sam