CDE Layer (1xEVDO)

CDE Layer trace data shows the Code Domain Error (CDE) value for each code channel (Walsh Code Number) within the specified code layer (Walsh Code Length). The CDE of a particular code channel is a measure of the error power in a code channel relative to the total signal power.

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Available only for reverse link direction channels.

CDE Composite trace data results are computed from the first measured half (0.5) slot. This is different than CDP Composite trace data results, which use Measurement Interval and Offset to determine the measurement data.

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 selecting a Walsh Code Length from the CDPLayer Walsh Code Length drop down list (MeasSetup > 1xEV-DO Demod Properties > Channel/Layer tab).