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Extra resources for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
Therefore, many of the OFDM subcarriers are not used for this burst and could be used for other bursts. In the constellation display of Figure 18, the signal (or lack of signal) from the unused subcarriers is shown by symbol states and a symbol target at the center of the constellation diagram. Indeed, the ideal location for the symbols associated with unused OFDM subcarriers is the exact center of the constellation diagram, signifying that no power is transmitted on these unused subcarriers and their associated logical subchannels.
Note that only 16QAM modulation now shows in the constellation display (along with the BPSK pilots). Your display should be similar to Figure 24, where traces B and C have been changed to error vector time and error vector spectrum, respectively. You will see from the error vector time display that only 4 symbols are being analyzed, and from the error vector spectrum display you will see that only a portion of the OFDM subcarriers are being used for the selected data burst. The OFDM subcarrier population may be viewed in greater detail by using the Select Area marker tool (chosen from the marker toolbar or by selecting Markers > Tools > Select Area) and X-axis scaling the error vector spectrum trace, focusing on perhaps the center 20% of the trace, by drawing a box and clicking Scale X.
Thus, you only need to create the signal definition once. The second way is to use the Zone Definition Grid. The Zone Definition Grid is a dynamic graphical user interface used to create uplink and downlink zone definitions. ) and then use the mouse to map the data burst region within the zone area of the Zone Definition Grid. When you have defined all the data bursts for the zone, you can save the completed zone definition to a map file. The third way is to use a Map File. omf extension) to simplify making measurements of frequently used signals.