Subcarr IQ Phase Error (TEDS)

Subcarr IQ Phase Error shows the IQ phase error for a selected Analysis Subcarrier on a symbol-by-symbol basis.

The trace below is a Normal Uplink, 50kHz channel bandwidth, 16QAM modulation. The 31 vertical lines (0 to 30) represent the 31 symbols for the selected subcarrier in a Normal Uplink slot format. Data symbols are colored red and and sync (first two symbols for this example), pilot, and header symbols are colored white.

Select Trace > Auto Scale to scale the trace. If the trace shows NO DATA, check your recorded signal or hardware input and your TEDS demod properties. TEDS demod parameter Pilot Tracking affects this trace.

Select Markers > Show Marker to place a marker on the trace; then review the symbol information in the marker readout window. Once you have a marker on the trace, use your up, down, left, and right arrow keyboard keys to move the marker through the symbol points.

IQ phase error refers to the difference in the measured phase for an IQ phasor versus the phase of the ideal (reference) phasor.

To view the composite IQ phase error for all subcarriers, see Overlaid IQ Phase Error.