Rohde & Schwarz SMW200A - Methods for Optimizing the Crest Factor

Configuring the Internal Baseband Source
R&S
®
SMW200A
250User Manual 1175.6632.02 ─ 16
Passband
The passband describes the frequency span that the filter passes unchanged. The
total passband of a filter is given as follows:
Bandwidth = (1 + "Roll Off Factor") * "Symbol Rate"
Cut Off Frequency Shift
The "Cut Off Frequency Shift" affects the cut-off frequency in the way that the filter
flanks are "moved" and the passband increases by "Cut Off Frequency Shift"*"Sample
Rate":
Cut Off Frequency = (1 + "Cut Off Frequency Shift") * "Sample
Rate"
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A "Cut Off Frequency Shift" = -1 results in a very narrow-band filter
●
Increasing the value up to 1 makes the filter more broad-band
●
By "Cut Off Frequency Shift" = 0, the -3 dB point is at the frequency determined by
the half of the selected "Sample Rate".
4.5.1.7 Methods for Optimizing the Crest Factor
Communication standards utilizing higher order modulation techniques or using multi-
ple carrier and complex signals consisting of the signals of more than one digital stan-
Common Functions and Settings in the Baseband Domain