Rohde & Schwarz 1321.0615.02, Руководство пользователя

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Modulation Analysis
R&S
®
Spectrum Rider FPH
249 User Manual 1321.1011.02 ─ 11
ence filter or measurement filter, are automatically selected by the R&S Spectrum
Rider.
1. Press [MEAS] key.
The R&S Spectrum Rider opens the measurement menu.
2. Select "Demod Parameters " softkey.
The R&S Spectrum Rider opens a submenu that contains the demodulation
parameters.
Selecting the filter type and roll-off factor of the measurement filter
Figure 10-4: Block diagram of measurement filter
1. Select "Filter Type" softkey.
Alternatively, select "Filter" in the Parameter View to select the filter.
The R&S Spectrum Rider opens a submenu that contains the different type of filter
for selection.
● "Root Raised Cosine" - Frequently used in the transmitter and receive filter to
perform matched filtering. It helps to remove the Inter-symbol interferences and
also to improve the use of spectral efficiency
● "Raised Cosine"" - The combined response of two RRC is the result of a raised
cosine filter
● "Gaussian" - Typically used in the FSK modulation
● "Unfiltered" - No filter used
2. Select the required filter type.
3. Select the "Demod Parameters " softkey.
The R&S Spectrum Rider opens a submenu that contains the demodulation
parameters.
4. Select the "Alpha/BT" to define the roll-off factor of the filter.
Alternatively, select "Alpha/BT" on the Parameter View to define the roll-off factor of
the filter.
The R&S Spectrum Rider opens an entry box to enter the roll-off factor.
Digital Demodulation
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