Advanced Carrier Setup (Framed Signal):1 2 3
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2. Baseband |
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Choice: AUTO | 2 | 4 | 8 | 16 | 32 | 64 |128 | 256 | 512 | 1024 |
Default: AUTO
Double-click or use the drop-down menu to set the oversampling ratio. The setting automatically selects the optimized oversampling ratio for the current signal setup.
The software automatically determines the Timeslot Timing Mode and Waveform Length value (number of points) based on the oversampling ratio.
A larger oversampling ratio (OSR) results in a more completely filtered image, but uses more waveform memory because it increases the number of waveform points. A smaller oversampling ratio reduces waveform file size, but may also reduce performance.
When an oversampling ratio of 2 to 64 is selected, Signal Studio sets the Timeslot Timing Mode to . If the Timeslot Timing Mode specified is set to , Signal Studio sets the Oversampling Ratio to .
To use a continuous PN9 sequence, lower oversampling values are needed:
13 multiframe—OSR of 2 or 4
26 multiframe—OSR of 2
When using a continuous PN9 sequence, do not select as the OSR setting. When set to , some settings can automatically increase the OSR, which increases the size of the waveform.
The maximum waveform length depends on the oversampling ratio, the number of frames, the number of multiframes and repetitions, the number of carriers, and your PC resources (memory size). If an Out of Memory error is reported, reduce the number of frames/multiframes frames, the number of multiframe repetitions, the number of carriers, or the maximum Frequency Offset (reducing the Frequency offset, reduces the oversampling ratio which reduces the amount of PC memory required).
View the 
selected
filter type
and associated parameter.
The Real-Time Modulation Filter is not supported on the EXT or the PXB.
Real-Time Modulation Filtering compatibility with the ESG/EXG/MXG, is not supported for:
Multicarrier configurations
GSM (GMSK) modulation
frequency offset settings on the carrier node
mixed-format configurations (i.e. real-time modulation needs to apply to all of the timeslots, using a single configuration)
Double-click or use the pull-down menu to set the real-time modulation filter.
When the Real-Time Modulation Filter is turned on and the hardware connection is established, the Arb Mode Filter selection changes to None and the other filter settings are grayed out (the instrument provides the filtering in real-time). Also the Oversampling Ratio selection set is to 1 by the Signal Studio software.
Choice: None | Nyquist | Root Nyquist | Gaussian | Rectangle | Edge | Edge Wide
Default: Gaussian
Double-click or use the drop-down menu to select the filter type.
If the oversampling ratio is set to 1, the filter type is automatically set to None and the filter types and corresponding parameters are not available.
If the oversampling ratio is set to any other value, you can select one of the listed filter types and edit the associated parameters.
Default: 0.22
Enter a value for the Alpha parameter. This parameter is available only for Nyquist and Root Nyquist filter types.
Default: 0.3
Enter a value for the BbT parameter. This parameter is available only for the Gaussian filter type.
View the selected
filter type
and associated parameter.
Choice: None | Root Nyquist | Nyquist | Rectangle | Gaussian | EDGE
Default: Gaussian
Double-click or use the drop-down menu to select a baseband filter type.
If the oversampling ratio is set to 1, the filter type is automatically set to and the filter types and corresponding filter parameters are unavailable.
If the oversampling ratio is set to any other value, you can select one of the listed filter types and edit the associated parameters.
Default: 0.22
Change the Alpha parameter for Root Nyquist and Nyquist filters. This field is unavailable for other filter selections.
Default: 0.3
Change the BbT parameter for a Gaussian filter. This field is unavailable for other filter selections.
This filter menu, , is unavailable when using an HSR (high symbol rate) carrier configuration.
View the selected
filter type
and associated parameter.
Choice: None | Root Nyquist | Nyquist | Rectangle | Gaussian | EDGE | EDGE Wide
Default: EDGE
Double-click or use the drop-down menu to select a baseband filter type. The EDGE Wide selection appears in the menu only when an HSR (high symbol rate) carrier configuration is selected.
If the oversampling ratio is set to 1, the filter type is automatically set to and the filter types and corresponding filter parameters are unavailable.
If the oversampling ratio is set to any other value, you can select one of the listed filter types and edit the associated parameters.
Default: 0.22
Change the Alpha parameter for Root Nyquist and Nyquist filters. This field is unavailable for other filter selections.
Default: 0.3
Change the BbT parameter for a Gaussian filter. This field is unavailable for other filter selections.
Range: 10 to 100%
Default: 100%
Set the clipping (limit) level of the I/Q waveform before filtering. (100.0% = no clipping)
Range: 10 to 100%
Default: 100%
Set the clipping (limit) level of the I/Q waveform after filtering. (100.0% = no clipping)
View the waveform length, displayed in points. You cannot edit this cell. The software automatically sets this value.
Increasing the Number of Frames or the Oversampling Ratio, increases the waveform length.
If you build a waveform from multiple carriers, Waveform Length is specific to an individual carrier. If the carrier Waveform Lengths are different, the shorter carriers' waveforms are repeated.
Range:
N5182B: –64 to 64 MHz
N5172B: –32 to 32 MHz
N5182A: –32 to 32 MHz
E4438C: –32 to 32 MHz
E8267D: –32 to 32 MHz
N5106A: –32 to 32 MHz
E6607: –32 to 32 MHz
Default:
0 Hz
Set the frequency offset of the carrier relative to the instrument's frequency setting. When you use the Frequency Offset feature, it increase the oversampling ratio, which increases the waveform length.
When using continuous PN9 data, ensure that is set to 0 Hz to minimize the waveform size.
Range: –70 to 0 dB
Default: 0 dB
Set the carrier's power relative to the signal generator's amplitude setting.
Range: 0 to 32768
Default: 0
Set the timing offset of the carrier. Timing offset increment value is 1 GSM/EDGE symbol.
Range: 0 to 359 degrees
Default: 0 degrees
Set the initial phase of the carrier.
1. GSM/EDGE/EGPRS2/Control Channels (Framed Signal - Advanced)
