CDP Layer (1xEVDO)

CDP Layer trace data shows the Code Domain Power trace data for all code channels (Walsh Code Number) within the specified code layer (Walsh Code Length). If the Measurement Interval is greater than one, all slots within the Measurement Interval are averaged together to produce the CDP Layer results.

CDP Composite trace data results are computed from data specified by the Measurement Interval and Offset parameters. The forward link CDP composite results are for the specified Analysis Channel. When Preamble is selected by Analysis Channel, CDP measurements only exist for cases where the preamble length is detected to be 1024 chips.

View CDP trace data as absolute power by clearing the Normalize IQ Traces check box (MeasSetup > 1xEV-DO Demod Properties > Advanced tab).

Display Format

The data is shown in a multi-color format that assigns a unique color to each code layer and related active code channels. This makes it easy to visually identify and distinguish the active code channels (Walsh Code Number) for a given code layer (Walsh Code Length). The colors are also user definable (see Display Preferences > Color tab).

For CDP and CDE trace data displays with separate I/Q channel trace bars, to position the Marker to the desired Code Layer/Channel bar, click in close proximity to the horizontal bar that indicates the value of the code channel being measured.

Selecting a Code Layer

Select the desired code layer by entering the Walsh Code Length in the CDP Layer Walsh Code Length text box (MeasSetup > 1xEV-DO Demod Properties > Channel/Layer tab).