Emerson R&S SGT100A User Manual page 109

®
R&S SGT100A
Filter Cut Off Frequency
Available only for "Clipping > On"
Sets the cut-off frequency of the final lowpass filter.
If 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. As a trade-off, the resulting
crest factor can increase.
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 can occur when I/Q signals of different length
are used. Thus, demodulation of a carrier can be difficult or even impossible.
We recommend you to consider timing already when creating the input I/Q files. Also,
adjust the signal duration to the carrier which is later demodulated (in this case, the
other carriers are for interfering the signal only). The problems do not arise with signals
of the same standard (e.g. 3GPP).
The following modes are available:
"Longest File Wins"
"Shortest File Wins"
"User"
"Least Common Multiple"
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:TIME:MODE
Signal Period
Available only for "Signal Period Mode > User"
Sets the signal period. Shorter I/Q files are repeated periodically, and only the first part
of longer I/Q files is used.
Remote command:
[:SOURce<hw>]:BB:ARBitrary:MCARrier:TIME
User Manual 1176.8674.02 ─ 12
The resulting signal period is defined by the longest I/Q file in the car-
rier table. Shorter I/Q files are periodically repeated.
The resulting signal period is defined by the shortest I/Q file in the
carrier table. Only the first part of longer I/Q files is used.
The signal period can be set in the "Signal Period" field. Shorter I/Q
files are repeated periodically, and only the first part of longer I/Q files
is used.
The output file duration is the least common multiple of all input file
durations.
Signal generator settings
Baseband
on page 424
on page 432
on page 432
109