Preamble Freq Error (802.11a/g/j/p OFDM)
Frequency error is the difference between the measured center frequency of the transmitted signal and the VSA center frequency. TheOFDM burst. This includes the constant frequency error as displayed in the Syms/Errs trace in addition to any time-varying frequency error.
trace shows the total frequency error during the preamble portion of theWhen Synchronization Reference (on the of the dialog box) is set to (the default for 802.11a), Preamble Frequency Error covers both the short training sequence and the channel estimation sequence. When the Sync type parameter is set to Channel Estimation Sequence, Preamble Frequency Error covers only the channel estimation sequence.
Preamble Frequency Error is sampled at 64 times the subcarrier spacing, which is 20 MHz for 802.11a/g and HIPERLAN/2 signals.
See Also