Finding the RMS Value of a Fading Signal Directly and Quickly from Its Decibel Values

Two methods are proposed for obtaining the rms value of a fading signal directly and quickly from its decibel values. The level-crossing-rate method shows that the rms values of most kinds of signals are within 3 dB above the signal levels at which their maximum level crossing rates occur. The direct method shows that the difference between the average of a decibel-scale fading-signal datum and the rms value of the signal is within 2.5 dB for most of the fading signals.