Spectrum (TD-SCDMA)

Spectrum trace data is the spectral display of the Raw Main Time data. The Raw Main Time data is Windowed and FFTed to generate the Spectrum display.

If averaging is on, Spectrum trace data is the averaged Instantaneous Spectrum trace data. When averaging is set to zero, the Spectrum trace data is equal to the Inst Spectrum trace data.

Since the windowing (unless it is Uniform) has the effect of emphasizing some parts of the time record more than others, the contributions of the different timeslots to this spectrum will vary. They will even vary from measurement to measurement if the Raw Time is not synchronized to the TD-SCDMA sub-frames, as in a non-triggered measurement. Therefore, amplitude readings from this trace should not be depended upon for absolute accuracy. For more accurate spectral measurements of an individual timeslot, use the Analysis Spec (and Inst Analysis Spec).