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AWR1843: Some question about convertSNRdBToVar between SRR demo and MRR demo

Part Number: AWR1843

Hello,ti's engineers

   I read the code about labs 2(SRR) and labs 7(MRR),I find the function about convertSNRdBToVar is different.

   In SRR demo:

   /* CRLB for a frequency estimate */
   fVar = (float)invSNRlin * (12.0f/((2.0f*PI_)*(2.0f*PI_))) * recipsp((n_samples*n_samples - 1));

   In MRR demo:

    /* CRLB for a frequency estimate */
    fVar = (float)invSNRlin * (6.0f/((2.0f*PI_)*(2.0f*PI_))) * recipsp((n_samples*n_samples - 1));

    Both demo the sinusoidal signal is complex,what is the reason for the difference?

BR

Bryant