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Additional resources for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
Pulse search failure. A variety of conditions may cause this error enunciator to appear (typically along with demodulation failure). You can disable the pulse search function in digital demodulation and configure a trigger as a substitute. The trigger may be internally generated using an IF magnitude value and appropriate holdoff and delay values, or external triggers may also be used if available. 41 Basic Digital Demodulation (continued) Common problems and troubleshooting approaches for “data burst” measurements The suggestions above for uniform measurements are also applicable to data burst measurements.
One application of this approach would be to examine band edges more closely to diagnose filtering problems or interference from an adjacent band. 58 For applications where it is desirable to focus the actual demodulation operations on a specific subcarrier or, more typically, a range of subcarriers, the Subcarrier Select function on the Advanced tab of the OFDMA Demodulation Properties dialog box will provide a solution. Since the demodulation itself is actually restricted to the selected subcarriers, the accuracy and robustness of the demodulation (including automatic recognition of modulation type, if selected) will depend on the signal quality of the selected subcarrier(s).
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. 4 µSec or exactly 4 OFDM symbols. The Timing Diagram on the Time tab now reflects the change in the time interval used for calculation and display of measurement results. Figure 30 shows the resulting constellation and OFDM Data Burst Info displays (trace C has been switched to this trace data type).
2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent