CCDF (GSM/EDGE/EDGE Evolution)
shows the complementary cumulative distribution function of the signal for the active part of the burst. The trace will continue to accumulate data from each sweep until the measurement is restarted.
From the CCDF Complementary Cumulative Distribution Function the probability that the power of a random data sample (x) is greater than K dB above the average power of the signal can be determined.
CCDF(K) = Probability(x ³ K)
This trace can be useful in designing an amplifier for a particular type of signal. For example, for a signal with the average power set at -10 dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer and an amplifier that saturates at -9 dBm, the percentage of the time that the signal will be 1 dB above the average (which is the percentage of time that the amplifier will saturate) can be determined by placing a marker on the CCDF trace at 1 dB.
For more information, see the CCDF trace topic in the Reference.
See Also
