CCDF (802.16 OFDM)
trace data displays the complementary cumulative distribution function (CCDF Complementary Cumulative Distribution Function) for the selected input channel. The complementary cumulative distribution function is a statistical power calculation and can only be performed on time-domain data. CCDF is the complement of CDF Cumulative Distribution Function: The cumulative probability that a parameter will be less than a given value X. and is defined as follows:
|
CDF(K) = Probability(x £ K) |
provides better resolution then for low prebability signals, especially when log format is used for the y-axis.
The is computed from the segment of the OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. burst specified by the and. If the Offset is zero and the Interval is equal to the , the burst preamble is included in the.
The VSA plots using units of percent (%) for the y-axis and power (dB) for the x-axis. Power on the x-axis is relative to the signal average power, so 0 dB is the average power of the signal. Therefore, a marker readout of
Trace A Marker 2 dB 12 %
means there is a 12% probability that the signal power will be 2 dB or more above the average power.
See Also
