Chapter 5 Functions of the Front Panel of VSA
RIGOL
RSA3000E User Guide
5-29
of the system.
In the digital demodulation, the symbol rate determines how often the symbols occur.
The number of bits represented by each symbol is determined by the current
modulation format. For example, in 2FSK, each symbol represents 1 bit.
Table 5-22 Symbol Rate
Parameter
Remarks
Default
1 MHz
Range
1 Hz to SRmax
[1]
Unit
GHz
、
MHz
、
kHz
、
Hz
Knob Step
100 Hz
Left/Right Arrow Key Step
Up/Down Arrow Key Step
1 kHz
Note
[1]
: The maximum symbol rate SRmax = SPmax × 1.28/(Points/Symbol). Wherein, SPmax is
the maximum span.
Meas Filter
Sets the type of the measurement filter, that is, the matching filter required for
vector modulation signal demodulation. The available choices include "No Filter",
"RRC" (Root Raised Cosine), "Gaussian", "Rectangular", and "User Defined" (Data 1
to Data 6).
Remarks:
You can modify alpha (cosine filter) or BT (Gaussian filter) to define the shape
and width of the cosine filter and Gaussian filter.
You can send the SCPI command
[:SENSe]:DDEMod:FILTer:MEASurement:USER<n>[:DATA] <ampl>{,<ampl>}
to self-define 6 measurement filters. After selecting one from Data 1 through
Data 6 in the "User Defined" filter, you can view the current data in the pop-up
User Define Filter window.
Click the "Apply" button or the Apply menu to select
the user filter; click the "Cancel" button or Cancel menu to deselect the user
filter.
Ref Filter
Sets the type of the reference filter, that is, the filter for constructing reference digital
modulation signal. The available choices include "Raised Cosine", "RRC" (Root Raised
Cosine), "Gaussian", "Rectangular", "Half Sine", and "User Defined" (Data 1 to Data
6).
You can send the SCPI command
[:SENSe]:DDEMod:FILTer:REFerence:USER<n>[:DATA] <ampl>{,<ampl>} to
