OFDM Ref (DOCSIS 4.0 Upstream)

When DOCSIS 4.0 Upstream Demodulation is selected, OFDM Ref trace is the reference IQ values for computing the signal EVM values. There is one complex value for each subcarrier for each OFDM symbol in the signal.

Trace Color coding Scheme

A multi-color coding scheme is used to make it easy to visually identify common symbols, subcarriers, and data results within various OFDM Traces. This makes cross trace data comparisons and analysis easy to accomplish. Different colors are assigned to symbols representing a common subcarrier type including: Pilot and Data subcarrier types. Some common color scheme Traces include: Error Vector Spectrum, Error Vector Time, and IQ Meas.

You can also customize and re-assign Trace colors schemes, see the Display Preferences Color tab (click Utilities > Display Preferences > Color tab and select a new color for the active Mod Type element).