CDE Composite (cdma2000/1xEV-DV)

CDE Composite trace shows the channel power error values for each active code channel (Walsh Code Number) for all code layers (Walsh Code Length). It also shows the CDE value for each inactive code channel at the lowest code layer. The CDE of a particular code channel is a measure of the error power in a code channel relative to the total signal power. When Normalize IQ Traces is on, the CDE is expressed in dBc deciBels referenced to the carrier: A technique for expressing a power measurement in logarithmic form using the carrier power as a reference., and is relative to the total power in the signal. When Normalize IQ Traces is off, the CDE is expressed in dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer.

$image\CDEformula_wmf.jpg$

CDE Composite trace data results are computed only from the first measured PCG (Power Control Group). This is different than CDP Composite trace data results, which can include more than the first PCG in the measurement results.

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.

Use the CDE Layer trace data display to view only one code layer (Walsh Code Length) at a time.