2-5 Fixed WiMAX Demodulator Chapter 2 —Fixed WiMAX Signal Analyzer
2-10 PN: 10580-00236 Rev. D WiMAX MG
Spectral Flatness
The Spectral Flatness view shows the data that is collected from the preamble at the channel
estimation step. The deviation of the Spectral Flatness from the average (over all of the
carriers) is shown in dB. A mask that conforms to the specification is overlaid on the trace.
Green color on the mask indicates pass, and red color indicates regions of the mask that fail.
The specification for the mask is:
0 to ±50 subcarriers < ±2 dB,
±50 to ±100 subcarriers < +2 dB and –4 dB
This mask is referenced from the average of all 200 subcarrier amplitude values. The
numerical result that is displayed in this view is the adjacent sub-carrier flatness (in dB).
Procedure:
1. Setup the measurement as described in “Setup for Fixed WiMAX Demodulator
Measurements” on page 2-8.
2. Press the Measurements main menu key.
3. Press the Demodulator submenu key.
4. Press the Spectral Flatness submenu key to activate the measurement.
The sample image in Figure 2-6 may differ from any image on your instrument.
Figure 2-6. Spectral Flatness
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