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Additional info for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
56 Advanced Digital Demodulation (continued) The analyzer display will now reflect only the first 4 symbols in the subframe, and from the map file you can see that these 4 symbols include the FCH, UL Map, DL map, and a portion of burst 1. Therefore, the only symbols shown in the constellation are either BPSK or QPSK. Close examination of the QPSK color-coding indicates that data from all four bursts are, in fact, included. Changing the Measurement Offset to 4 symbols results in a measurement of only the last 4 symbols in this subframe and appropriate changes in the timing diagram on the Time tab.
The map file shows logical subchannels on the Y axis and OFDM symbols on the X axis. In addition to the FCH, 3 data bursts are defined and color-coded as shown in Figure 14. 32 Figure 14. This Zone Definition Grid map was provided by a user map file. The color-coding of the bursts in this map will appear in all the bursts’ measurement and error displays. Basic Digital Demodulation (continued) After selecting the map file, the default is for display and analysis of all data bursts in the map. This means that all measurement displays and the error statistics summary table reflect the composite of all the data bursts in the map.
The technique described previously would normally be used to manually define zone maps to match the signal under test or to experiment with unknown signals to learn their structure. Figure 24. Data burst measurement of a single burst from a downlink FUSC signal. Burst 2, with 16QAM modulation has been chosen for analysis. 51 Advanced Digital Demodulation (continued) The next step is to experiment with re-defining the data burst to include fewer logical sub-channels and/or fewer symbols. Follow the same procedure to again bring up the Edit Downlink Zone Definition Map dialog box: From the Zone Definition tab of Demodulation Properties, click Edit Map Files > Edit (with i80216e_10MHz selected).