Waveform Parameters (DVB-S2/S2X)

The Waveform Generation parameter group configures the settings needed to define the generated DVB-S2/S2X signal, predistort the waveform with the measured EQ response, add AWGN Additive White Gaussian Noise - Statistically random radio noise characterized by a wide frequency range with regards to a signal in a communications channel. and recall as a recording, save to a file or download to a source.

Signal Length – Specifies the signal length in frames.

Default: 1 Frame

Oversample Ratio – Specifies the oversample ratio of the waveform.

Default: 4

Predistortion – Applies linear channel unflatness pre-compensation (FIR Finite Impulse Response filter) to the waveform based on the measured EQ response calculated in the Eq Correction Spectrum trace.

Off – Predistortion is not applied to the generated waveform.
Measured Channel – Predistortion is applied to the waveform. When you choose to predistort the waveform with the measured EQ response (see Eq Correction Spectrum), the measured EQ response is only applied when the current measurement is successful. If the current measurement is not finished because of sync not found, the generated waveform will not be predistorted with the measured EQ response. In this case, the Predistortion setting will be Off and cannot be changed to Measured Channel.

If you are unable to select Measured Channel, make sure equalization is turned on (In Basic mode, set Demod > Equalization to Track or Hold. In Advanced mode, select a Measurement Control > Channel Estimation Source other than Off).

Default: Off

Choices: Off, Measured Channel

AWGN

AWGN Added – Enables or disables adding AWGN to the generated DVB-S2/S2X waveform.

Default: Disabled (cleared)

Carrier To Noise Ratio – For bursted signals, when AWGN is enabled for the waveform with the specified Carrier To Noise Ratio, the noise is added over the whole signal (active and inactive part), but the Carrier To Noise Ratio is the ratio of the active signal power over the noise power.

Default: 40 dB

Read-only information about the waveform

Advanced configuration mode

Symbol Rate = Frame Definition > Symbol Rate
Sample Rate = Symbol Rate x Oversample Ratio
Total length = When Auto Detect Mode = None, total length is defined by the Frame settings and Result Length; when Auto Detect Mode = Static or Dynamic, total length is the auto detected measurement interval.

Recall As Recording – Recalls the currently configured DVB-S2/S2X signal as a recording using the waveform generation settings. Recall As Recording automatically recalls the current waveform as a recording and begins to play it. For configurations with multiple component carriers, the waveform with the selected Component Carrier is recalled. If Component Carrier is set to All, only the first CC's waveform is recalled.

Download to Source – Downloads a waveform created based on the current DVB-S2/S2X configuration to a properly configured, connected source. For configurations with multiple component carriers, the waveform with the selected Component Carrier is downloaded. If Component Carrier is set to All, only the first CC's waveform is downloaded.

Save to File – Saves the currently configured DVB-S2/S2X signal as one or more VSA MATLAB (.mat) waveform files, depending on the number of component carriers and the Component Carrier selection. For configurations with multiple component carriers, if Component Carrier is set to All, when you click Save to File, a file is generated for each CC.