Analysis PDF (TD-SCDMA)

Analysis PDF trace data displays the Probability Density Function for the selected Sub-frame (SF 1) Spreading Factor, or 2) service flow: A unidirectional flow of medium access control (MAC) service data units (SDUs) on a connection that is provided a particular Quailty of Service (QoS).) and Timeslot (TS Technical Specification). PDF 1) Probability Density Function Trace Data, or 2) Portable Document Format (PDF) created by Adobe Systems is an open standard for document exchange. indicates the probability that a given level has occurred.

Analysis Timeslot and Analysis Sub-frame parameter entry shortcut: Right click on the desired Timeslot in the Overall Time trace data display, then select Copy Marker to Analysis TS/SF.

Overview

PDF is equivalent to a normalized histogram. A histogram shows how the amplitude of a signal is distributed between its maximum and minimum values. Amplitude is displayed on the X-axis, and number of counts on the Y-axis.

The number of averages for a histogram determines the number of counts in the histogram; in other words, how many records are measured¾the records are not averaged. If averaging is off or if exponential averaging is selected, the measurement continues indefinitely. Keep in mind that the accuracy of the histogram is dependent on the frequency span and number of averages (if averaging is on).

PDF trace data is normalized by multiplying the number of averages by the number of points in the time record, then dividing this value by the DV spacing on the X-axis. The probability of a signal falling between two points is equal to the integral of the curve between those points.

PDF trace data displays the number of points used in its computation above the trace (Pts:). It also displays the average level (Avg:) above the trace.