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

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

Sample text

Set. To use this map file it is only necessary to select the Use Map File box. An entry field and drop-down list in this area will show only and i80216e_10MHz (from setup) as map file choices unless others have been defined. 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.

Figure 28. The Time tab on the OFDMA Demodulation Properties dialog box includes an active timing diagram (derived from the signal and user settings, and updated as the measurement configuration is changed) to help you visualize your signal for easier measurement setup. You can perform a simple time-specific analysis of the subframe by selecting the Manual Measurement Region check box and entering a measurement interval of 4 symbols. With a measurement offset of 0 symbols, the result will be a measurement isolated to the first 4 symbols of the subframe, and a display in the Time tab similar to Figure 29.

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.

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