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Extra resources for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
The offset (a negative or positive number) is the first numbered carrier to be included in the measurement results, and the interval (a positive number only) is the number of adjacent subcarriers to include. If, for example, the offset is set to –10 and the interval is set to 20, the 10 carriers on either side of the (untransmitted) center carrier will be displayed and measured, as shown in Figure 31. In this figure, the X-axis of the error vector spectrum display has been expanded by a factor of 20 to show these carriers more clearly.
For instance, the Pre-demod Waveform and Include extra time in pre-demod traces selections affect the time-domain gating of the signal, but only for pre-demod traces, including Time, Spectrum, and CCDF. This is useful for measuring characteristics of regions which are adjacent to the portion of the waveform used for modulation analysis. You can find more information on these and other selections on the Time tab in the 89600 VSA’s extensive Help text. Figure 30. Manually selecting a measurement region (time interval) of 4 symbols with an offset (delay) of 4 symbols produces a result which does not include the FCH, DL-Map or UL-Map.
The default Zone Definition Grid map is shown at the bottom of this tab; only the FCH data burst has been defined. Other data bursts could be defined manually (this will be discussed in a later section of this note), but for this measurement we will use a zone definition map file that has already been constructed for this recording. This user map file is attached to a setup file provided with the 89600 software in the same location as the recorded signal. set. To use this map file it is only necessary to select the Use Map File box.
2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent