R&S SGT100A User Manual page 129

®
R&S SGT100A
"Maximize"
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CFACtor:MODE
Clipping
Switches baseband clipping on and off.
Clipping reduces the peak power of the resulting multi carrier signal according to the
input parameter "Target Crest Factor".
The resulting clipped peak power is defined by the sum of the RMS level of the unclip-
ped multi carrier signal and the input parameter "Target Crest Factor". Note that clip-
ping reduces also the RMS level. Hence the resulting crest factor of the clipped signal
is slightly above the "Target Crest Factor". In order to get the unclipped parts of the
clipped multicarrier signal matched with the unclipped multicarrier signal, the RF output
power should be reduced by the difference between resulting crest factor and "Target
Crest Factor".
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CLIPping[:STATe]
Target Crest Factor
Available only for "Clipping > On".
Sets the value of the desired crest factor.
A "Target Crest Factor" above the crest factor of the unclipped multicarrier signal has
no effect.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CLIPping:CFACtor
Filter Cut Off Frequency
Available only for "Clipping > On"
Sets the cut off frequency of the final lowpass filter.
When the cut off frequency is set as half of the output sample rate, a final lowpass filter
improves the spectrum of the clipped multicarrier signal, but may also increase the
resulting crest factor.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:CLIPping:CUToff
Signal Period Mode
Selects the mode for calculating the resulting signal period of the multi carrier wave-
form. The carrier table provides an information button to obtain sample rate and file
length data of each carrier.
The resulting period is always calculated for all carriers in the carrier table irrespective
of their state (On/Off).
Note: Wrap-around and timing problems may occur when I/Q signals of different length
are used. Thus, demodulation of a carrier may be difficult or even impossible. It is
therefore recommended to consider the timing already when creating the input I/Q files
User Manual 1176.8674.02 ─ 07
The crest factor is maximized by internally calculating optimized car-
rier phases. The "Phase" setting displayed in the carrier table is inva-
lid.
Signal Generator Settings
Baseband
on page 373
on page 375
on page 374
on page 374
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