New PDF release: 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and

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Additional resources for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent

Example text

From the Zone Definition tab click Edit Map Files, select the i80216e_10MHz map file and click Delete. set and you will see the zone definition map (for Zone 1) return to the original configuration with three data bursts. Advanced Digital Demodulation (continued) Measuring specific time or symbol intervals Time-specific measurements are an essential element of troubleshooting any system using time-varying signals such as pulsed/bursted transmissions, TDMA techniques, variable power levels or boosting, etc.

48 Figure 23. Pilot tracking parameters including amplitude, phase, and timing can be selected in any combination on the Advanced tab of the OFDMA Demodulation Properties dialog box. Advanced Digital Demodulation (continued) Phase tracking (default for the 89600 VSA is Track Phase On). Operation is similar to amplitude tracking, except that the analyzer demodulation tracks the phase of the pilot carriers. Close-in phase noise, for example, can be removed or tracked out by phase tracking. As with amplitude tracking, when phase tracking is selected, the tracking results can be analyzed by viewing the phase portion of the Common Pilot Error data type.

In uplink measurements, the 89600 VSA defaults to a measurement of EVM which includes the contribution of unused subchannels. The 89600 VSA automatically reports RCE (EVM) of unmodulated carriers in its Syms/Errs table. This is in some ways similar to a noise power ratio measurement or code domain error. Where it is desirable to view only the active subchannels associated with the selected data burst, the display configuration can be changed by clearing a box on the Advanced tab of the OFDMA Demodulation Properties dialog box labeled Include Inactive Subchannels in EVM.

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2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent


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