USER’S MANUAL__________________________________________________________________
196 _________________________________________________________________ M211322EN-D
0916-051
Figure 37 Linearization of Saturated Signals Above + 8 dBm
6.1.7 Correction for Tx Power
Fluctuations
The RVP900 can perform pulse-to-pulse amplitude correction of the
digital (I,Q) data stream based on the amplitude of the Burst/COHO input.
The technique computes a (real valued) correction factor at each pulse by
dividing the mean amplitude of the burst by the instantaneous amplitude of
the burst. The (I,Q) data for that pulse are then multiplied by this scale
factor to obtain corrected time series. The amplitude correction is applied
after the Linearized Saturation Headroom correction.
The mean burst amplitude is computed by an exponential average whose
(1/e) time constant is selected as a number of pulses (See Section 4.2.2 Mp
— Processing Options on page 106). A short time constant will settle
faster, but will not be as thorough in removing amplitude variations (since
the mean itself will be varying). Longer time constants do a better job, but
will require a second or two before valid data is available when the
transmitter is first turned on. The default value of 70 gives excellent results
in almost all cases.
Whenever the RVP900 enters a new internal processing mode (time series,
FFT, PPP, etc.), the burst power estimator is reinitialized from the level of
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