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Waveform Setup

Shortcut by Application

Opens a drop-down menu where you can quickly access preset configurations for a specific application. (See table of selections below.)

Shortcut by Modulation

Opens a drop-down menu where you can quickly access preset configurations for a specific modulation type. (See table of selections below.)

1. Custom Modulation

Playback License Mode

Choices: PC License | Instrument License

Default: PC License.

Select the playback license mode. If no PC license is available, only Instrument License can be used.

Licensing of Signal Studio Pro Software

License Mode Switching

You can switch waveform playback license mode to take advantage of an instrument license, even when a PC license is available with GUI parameter "Playback License Mode" under "Waveform Setup" node, "Basic" group.

• Playback License Mode has 2 selections:  PC License | Instrument License

• When "PC License" is selected, "Waveform Name" should be hidden (you cannot change the waveform name). And Waveform Name API is read-only (not accepting waveform name change).

• When valid PC license (N7608APPC) exists, this parameter is active and you can choose either one.  Default is "PC License."

• When valid PC license does NOT exist, this parameter is read-only and "Instrument License" mode is selected.

• Window caption displays "[PC License]" or "[Instrument License]" to indicate the currently selected license mode.

  

Required License Version Date

Default (or base value): 2023.0801

Read-only. This value will update based on the feature’s required license version.

Custom Modulation

Choices: Custom IQ | Custom OFDM | 5G Candidate

Default: Custom OFDM

Select the custom modulation format of the waveform. The tree view nodes and associated properties in the parameter view change with each selection.

• Custom IQ: Single carrier signal with user-defined IQ constellations.

• Custom OFDM: Multicarrier signal based on OFDM with user-defined settings.

• 5G Candidate: Multicarrier signal with 5G PHY scheme.

2. Basic

Number of Frames

Range: 1 to 300

Default: 1

Enter the number of frames included in the waveform.

User Defined Sample Rate

Choices: On | Off

Default: Off

Enable or disable the User Defined Sample Rate, if enabled, the OverSamplingRatio will not be used.

Oversampling Ratio

Range:

OFDM/F-OFDM: 1 to 1024

Others: 2 to 1024

Default:

Custom IQ: 32

Custom OFDM: 4

5G Candidate: 4

Enter the oversampling ratio of the waveform. The Total Sample Points is automatically determined based on the oversampling ratio.

Oversampling Ratio is not applicable for Radar signal.

Sample Rate

Range: 100 MHz to 100 GHz

Default: 200 MHz

Set the value of user defined sample rate if user defined sample rate is enabled.

Total Sample Points

Displays the generated waveform length in sample points. This value is read-only and automatically updates with changes to oversampling ratio, number of frames, and custom modulation type.

Waveform Length

Displays the generated waveform length in seconds. This value is read-only and automatically updates with changes to oversampling ratio, number of frames, and custom modulation type.

Mirror Spectrum

Choices: On | Off

Default: Off

Enable or disable the mirror spectrum (inverted IQ) for the waveform.

Number of Antennas

Range: 1 to 8

Default: 1

Enter the number of antennas included in the waveform,

When the Number of Antennas is larger than or equal to 2, each antenna’s CCDF and waveform plots are figured individually.

3. Marker

Marker 1 Source

Choices: Waveform Start | Frame Start | RF Blanking Control | RF ALC Control

Default: Waveform Start

Select the source for marker 1.

• Waveform Start: It indicates the beginning of the waveform.

• Frame Start: It indicates the beginning of each frame in the waveform.

• RF Blanking Control: It indicates the burst part in the waveform.

• RF ALC Control: It indicates the part used for ALC control in the waveform.

Marker 2 Source

Choices: Waveform Start | Frame Start | RF Blanking Control | RF ALC Control

Default: Frame Start

Select the source for marker 2.

• Waveform Start: It indicates the beginning of the waveform.

• Frame Start: It indicates the beginning of each frame in the waveform.

• RF Blanking Control: It indicates the burst part in the waveform.

• RF ALC Control: It indicates the part used for ALC control in the waveform.

Marker 3 Source

Default: RF Blanking Control

Displays the source for marker 3. RF Blanking Control is always used as Marker 3 source.

Marker 4 Source

Default: RF ALC Control

Displays the source for marker 4. RF ALC Control is always used as Marker 4 source.

4. Crest Factor Reduction

Crest Factor Reduction

Choices: On | Off

Default: Off

Enable or disable the crest factor reduction for the waveform. When enabled, peak cancellation algorithm is used to subtract a weighted version of the cancellation pulses from the original input signal. It strikes a balance between the out-of-band emission and in-band waveform quality when reducing the PAPR of the signal.

Target PAPR

Range: 3 to 100 dB

Default: 8 dB

Set the PAPR value to achieve after crest factor reduction.

Max Iteration

Range: 1 to 20

Default: 10

Specify the maximum times of iteration.With the increasing of iteration, the PAPR value should converge to a steady level.

Cancelling Percent

Range: 0 to 100%

Default: 100%

Specify the percentage that the cancellation pulses can be removed.

Block Size

Range: 20 to Waveform Total Sample Points

Default: 1000

Block is the range that a single cancellation pulse can be identified. If the waveform length is L, and the block size is B, then the number of blocks is N=floor(L/B)+1. Therefore, there will be N pulses at most to be removed.

Filter Mask

Opens the Filter Mask for Crest Factor Reduction editor to define a filter response in frequency domain. In the table, the frequency points must be entered with an order of increasing frequency in unit of MHz, and its corresponding amplitude is in unit of dB. When generating this filter mask, the frequency points between the specified points are linearly interpolated. When signal symbol rate is changed, this table will be automatically updated. User may need to adjust the mask manually to fit the signal bandwidth.

The format of Filter Mask string, appearing in the parameter field, is: <freq 1>,<amp 1>; <freq 2>,<amp 2>;….<freq n>,<amp n>.

Multicarrier

Multicarrier Enabled

Choices: On | Off

Default: Off

Enable or disable the multicarrier mode for waveform generation, when enabled, waveform which has at least one carrier will be generated, the count of carriers is decided by the frequency offsets definition, When disabled, waveform with only one carrier will be generated.

Number of Carriers

Indicate how many carriers has been defined and is a read only value.

Carrier Phases

Choices: Fixed | Random

Default: Random

Define the initial phase of every carrier when multicarrier mode enabled. “Fixed” means all carriers has same initial phase which is zero; “Random” means initial phase of every carrier is random value.

Continuous Payload

This feature requires license version 2024.0801 or later.

Choices: On | Off

Default: Off

Supported for multicarrier mode with Custom OFDM.

It’s default to Off to be backwards compatible, so every carrier read from the beginning of the IQ Values/Payload data bits. When it turns On, the IQ Values/Payload data bits will be used as a circular buffer for multi-carriers continuously. The IQ Values for Multi-Carriers string parameter to be used with Continuous Payload On and user can manually configure the desired values. IQ Values for Multi-Carriers is available for Preamble and Pilot (Pilot Data Mode is IQ Values).

Also, Saving VSA 89600 Setup will automatically generate multiple SETX files for multi-carriers.

Payload Data Offset

Range: 0 to 65535

Default: 0

Define the payload data offset between each carriers when multicarrier mode enabled, it is only applied for Custom IQ.

Frequency Offsets

Opens a window where you can define the frequency offset of every carrier for multicarrier mode. There are three methods that can be used:

• To configure by individual carrier, use "," as delimiter. For example: "1MHz,2MHz,10MHz,20MHz" as frequency offsets for 4 carriers.

• To configure by a range of carriers, use ":" to define the start frequency offset of first carrier, frequency step and the count of multi carriers. For example,"1MHz:2MHz:5" means 5 carriers offsets defined as "1MHz,3MHz,5MHz, 7MHz,9MHz"

• Above 2 ways can be used by combination. For example: "1MHz:2MHz:5, 20MHz,30MHz"

Power Offsets

Opens a window where you can define the power offset of every carrier for multicarrier mode. There are three methods that can be used:

• To configure by individual power offsets, use "," as delimiter. For example: "0,-1,0,-1" means the power offset for 1st carrier is 0 dB , -1dB for 2nd carrier,0dB for 3rd carrier and -1dB for 4th carrier.

• To configure by a range of power offsets, use ":" to define the power offset of first carrier, power offset step and the count of multi carriers. For example,"0:-1:5" means "0,-1,-2, -3,-4".

• Above 2 ways can be used by combination. For example: "0:-1:5, -8,-9".

The count of final power offsets definition is also decided by value of frequency offsets, because they need to have same count.

Unit is dB.

6. Correction

Equalization Enabled

Choices: On | Off

Default: Off

Coupling: Coupled with VSA Equalization Data File and Equalization Bandwidth.

Enable or disable equalization for waveform generation. When enabled, equalization will be applied to the generated waveform according to the EQ Data from VSA.

VSA Equalization Data File

Choices: The file type should be .csv

Load the EQ data file from VSA. You can type out the directory of the EQ file or browse it in your computer.

Equalization Bandwidth

Range: The equalization bandwidth should not be larger than the sampling rate of the waveform

Coupling: Coupled with the sampling rate of the waveform

The equalization will be performed within this bandwidth.

Graph View

The graph view displays several different representations of the generated waveform. For more information, see Graph View.