We need to express power levels in some terms weather it is CDMA technology or GSM technology. for that we use dB, dBm and dBW as unit of power levels which are differentiate with reference power level.
dB is a relative measurement of two different power levels.
dB = 10 Log (P1/P2)
If we take reference power is 1W then it is dBW
dBW = 10 log(P1/1 W)
If We take reference power is 1mw then it is dBm
dBm = 10 Log(P1/1 mw)
Normally we use dB when expressing the ratio between two power values and dBm when expressing an absolute value of power.
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