Read or Download 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent PDF
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Additional resources for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
This uniform uplink signal is a relatively straightforward signal to analyze, as it uses only one type of modulation for the data carriers for a single data burst, and does not include a preamble or FCH. Figure 17. A uniform 64QAM uplink signal, correctly demodulated after Data Burst Analysis is switched off. The analyzer automatically detects the single type of data modulation. 37 Basic Digital Demodulation (continued) For the analyzer or a receiver, demodulating uplink subframes may be a challenge for several reasons.
Again, prior to recalling the signal and its setup file, you should Preset Setup to avoid having previous settings contaminate the new setup. set setup file, choose the appropriate Uplink subframe type in the OFDMA Demodulation Properties dialog box’s Format tab. Changing trace B from spectrum to error vector time produces a display similar to that of Figure 18. After switching to the uplink subframe type, the analyzer has defaulted to measurement of the first zone of the subframe; a PUSC zone.
Noisy constellations with a large symbol clock error (SymClkErr, see the table in the Syms/Errs trace data type), or unlocked measurements. These phenomena may be caused by incorrect values of the Bandwidth (or Nominal BW if set manually) value in the Format tab of the OFDMA Demodulation Properties dialog box. The bandwidth value determines OFDM carrier spacing, and it should be set as closely as possible to the actual value. Subcarrier measurements such as those described in the time and frequency (vector) domain section earlier in this application note may be helpful in determining the exact subcarrier spacing and the actual bandwidth of a specific signal.
2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
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