Freq Err (802.16 OFDMA)
Freq Err (Frequency Error) shows the carrier frequency error relative to the VSA's center frequency. This parameter is displayed in Hertz and is the amount of frequency shift, from the VSA's Center Frequency, that the VSA must perform to achieve carrier lock.
(Downlink Only) For the actual FFT Fast Fourier Transform: A mathematical operation performed on a time-domain signal to yield the individual spectral components that constitute the signal. See Spectrum. demod, the carrier frequency is initially determined from the preamble. The frequency error reported in the summary table is the value from the final frequency estimation based on the channel estimation sequence with a fine adjustment made for any frequency error detected in the pilot tracking. The pilot tracking does not correct the signal for frequency errors, it only corrects the post-FFT symbols for phase (and amplitude, if selected).
Errors in RF Radio Frequency: A generic term for radio-based technologies, operating between the Low Frequency range (30k Hz) and the Extra High Frequency range (300 GHz). frequency, LO frequency, or digitizer clock rate could all appear as carrier frequency error.
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