How can I convert data from dBW units to dBm in MATLAB 7.5 (R2007b)?

Fakhr-al-din - 2021-03-22T14:46:59+00:00

Question: How can I convert data from dBW units to dBm in MATLAB 7.5 (R2007b)?

I have some data in  MATLAB that represents power density measured in dBW, and I would like to convert the data to units of dBm.  

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Expert Answer

Prashant Kumar answered . 2025-11-20

       dBW = 10*log10(Pxx/(1 Watt))

          = 10*log10(Pxx)             for Pxx in Watts

      dBm = 10*log10((1000 mW/W)*Pxx /(1 milliWatt))

          = 10*log10(1000*Pxx)

          = 10*log10(Pxx) + 10*log10(1000)

          = 10*log10(Pxx) + 10*(3)

          = 10*log10(Pxx) + 30

          = dBW + 30

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