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Additional info for 2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent
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. Since all the subcarriers now defined for this burst are actively modulated with the right format for the selected duration of the new burst, the error parameters should all be low, as shown in Figure 25.
Demodulation of the PUSC zone of a 16QAM uplink signal. The constellation diagram also includes the BPSK pilots and a central symbol target for subcarriers not used by the mobile station. 39 Basic Digital Demodulation (continued) transmissions on these frequencies by other mobile stations, especially in unfavorable near/far configurations of transmitters and receivers. In uplink measurements, the 89600 VSA defaults to a measurement of EVM which includes the contribution of unused subchannels. The 89600 VSA automatically reports RCE (EVM) of unmodulated carriers in its Syms/Errs table.
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2006-0606.IEEE 802.16e WiMAX OFDMA Signal Measurements and Troubleshooting- Agilent