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AWR1243: How to determine the spectral power

Peter Aberl
Expert 3180 points
Part Number: AWR1243

Hi mmWave Champs,

Once you post-process the raw ADC data and you apply the FFT analysis, there should be a correction factor that need to be used to represent the spectral power in terms of dBFS or dBm. Please advise how to retrieve power figures from FFT results.

Thanks,
Peter. 

  • 0
    TI__Guru 58035 points
    Hello Peter,
    Typically when a FFT is done in matlab the signal amplitude gets multiplied by the number of points of the FFT. If you do a N point FFT the amplitude is got by dividing the FFT peak by N.
    Once the amplitude is got the dBFs is got by comparing it with the ADC full scale amplitude. For a 12bit ADC mode , for example, the full scale is +-2^11 , ie +-2048. So if the amplitude got is 1024 , for example, the dBFs would be 10*log(1024/2048), ie -3dBFs.

    Regards,
    Vivek