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Extra info for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
Including both the preamble (also called the channel estimation sequence) and the subframe data improves the channel equalization estimate, and is called data-driven equalization. The improved channel equalization estimate has the dual benefits of typically more accurate modulation quality results and a more accurate estimate of the channel frequency response for display and analysis. Advanced Digital Demodulation (continued) For the design engineer, a major benefit of equalization is that the results can be viewed, quantified, and then used to find the source of problems.
48 Figure 23. Pilot tracking parameters including amplitude, phase, and timing can be selected in any combination on the Advanced tab of the OFDMA Demodulation Properties dialog box. Advanced Digital Demodulation (continued) Phase tracking (default for the 89600 VSA is Track Phase On). Operation is similar to amplitude tracking, except that the analyzer demodulation tracks the phase of the pilot carriers. Close-in phase noise, for example, can be removed or tracked out by phase tracking. As with amplitude tracking, when phase tracking is selected, the tracking results can be analyzed by viewing the phase portion of the Common Pilot Error data type.
Data burst analysis of a portion of the original burst 2. The error vector time (lower left) trace shows that only 3 symbols are measured, and the error vector spectrum (upper right) shows the sparse OFDM subcarrier population representing the one measured logical subchannel. 52 Note the differences in the error vector time and error vector spectrum traces. The measured result in time is now 3 symbols long, and the OFDM subcarrier population (representing a single logical subcarrier) is much more sparse.
2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent