IQ Signal Masterâ„¢ MX280005A Vector Signal Analysis Software Help : Basic Operation : Modulation Parameters Tab : Filter Button
 
Filter Button
Press the Filter button to display the filter parameter setting dialog box as shown in Figure: Formatted Frame Filter Dialog.
Formatted Frame Filter Dialog
Measurement Filter
Sets the reception filter. The Filter Parameter Setting dialog box shows the basic filter settings on the left and the 2nd filter on the right. Displayed characteristics are combined characteristics of 2 filters.
Measurement filter is used to filter the received signal just before demodulation. Some systems split the pulse-shaping filter between the transmitter and receiver side (e.g. Root Nyquist at transmitter and Root Nyquist at receiver) and in this case the filter at the receiver side is the measurement filter. The Filter settings are described in Table: Filter Settings.
Filter Settings
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Measurement Filter
Selected modulation type settings for the first filter list is listed in Table: Measurement Filter Settings.
Selected modulation type settings for the second filter list is listed in Table: Settings of 2nd Measurement Filter.
For more on Filter and Second Filter, see Filter and Second Filter.
Reference Filter
Settings are described in Reference Filter.
For more on Filter and Second Filter, see Filter and Second Filter.
Roll Off / BT
Sets the filter roll off ratio
(Root Nyquist/Nyquist/ARIB STD-T98) or bandwidth time product. This is applied when the Measurement Filter or Reference Filter setting is set to Root Nyquist, Nyquist, ARIB STD-T98, Gaussian or Inverse Gaussian.
First Filter Range: 0.03 to 1.00
Second Filter Range: 0.030 to 1.000
User Defined Filter
Measurement Edit
This selects the definition file for the filter used as the Measurement Filter. If no file is specified, the setting is Root Nyquist.
Reference Edit
This selects the definition file for the filter that removes the adjacent waves. If no file is specified, it is regarded that Multicarrier Filter is set to None. Reference Filter settings are described in Table: Settings of Reference Filter.
Measurement Filter Settings
Availability of the basic measurement filter settings are shown in Table: Measurement Filter Settings and the 2nd filter setting in Table: Settings of 2nd Measurement Filter.
Measurement Filter Settings
Filter Type
Modulation Type
2FSK
4FSK
H-CPM
Other
Root Nyquist
Yes
Yes
Yes
Yes
Nyquist
Yes
Yes
Yes
Yes
None
Yes
Yes
Yes
Yes
Gaussian
Yes
Yes
Yes
No
ARIB STD-T98
No
Yes
No
No
Rect
No
Yes
No
No
Inverse Rect
No
Yes
No
No
Inverse Gaussian
No
Yes
No
No
H-CPM_P25
No
No
Yes
No
User Defined
Yes
Yes
Yes
Yes
Settings of 2nd Measurement Filter
Filter Type
Modulation Type
4FSK
Other
None
Yes
Yes
Rect
Yes
No
Inverse Rect
Yes
No
Inverse Gaussian
Yes
No
Inverse Gaussian
Yes
No
Reference Filter
Sets the filter used for the reference signal. The Filter Parameter Setting dialog box shows the filter on the left and the 2nd filter on the right. Displayed characteristics are combined characteristics of 2 filters. Reference filter is used to filter the reference (no error) signal. It is the total filtering used in the system (transmitter filter plus receiver filter). Availability of the reference filter type settings are shown in Table: Settings of Reference Filter.
Settings of Reference Filter
Filter Type
Modulation Type
O-QPSK
2FSK
4FSK
H-CPM
2ASK/4ASK
MSK
Other
Root Nyquist
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Nyquist
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Gaussian
No
Yes
Yes
Yes
Yes
Yes
No
Gaussian2
No
Yes
Yes
Yes
Yes
No
No
ARIB STD-T98
No
No
Yes
No
No
No
No
Half-sine
Yes
No
No
No
No
No
No
Rect
No
Yes
Yes
Yes
No
No
No
H-CPM_P25
No
No
No
Yes
No
No
No
User Defined
Yes
Yes
Yes
Yes
Yes
Yes
Yes
User Defined Filter
When User Defined is set at Measurement Filter or Reference Filter, any user filter can be used. For details on user filter and definition filter, refer to Filter Definition Settings.
Filter and Second Filter
For both Measurement Filter and Reference Filter, normally select the type of Filter only and select None for 2nd Filter. Then, the characteristics of Measurement Filter and Reference Filter shall be those set in the Filter Parameter Setting dialog box. If other than None is selected for both Filter and 2nd Filter, then the characteristics of Measurement Filter and Reference Filter are combined characteristics of Filter and 2nd Filter.