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How to Simply Generate a PSK Modulation

Phase-Shift Keying (PSK) is a technique used to transmit data by modifying the phase of a sinusoid carrier wave. The Tabor family of Arbitrary Waveform Generators (AWGs) supports PSK modulation according to the following variations: PSK, BPSK, QPSK, OQPSK, pi/4DQPSK, 8PSK, 16PSK, as well as user-defined variations.

This document will quickly guide you through the definition process.

 


NOTE
You can also generate Quadrature Amplitude Modulation (QAM) by following steps similar to those described in this document.


 

The front panel of the AWG is depicted below.


  • To generate a PSK Modulation using the front panel:

1. Press the Modulation button in the function menu.



2. Press the Modulation Type menu button. A list of modulation types appears on the screen. By default, the modulation type is set to “OFF”.



3. Select the (n)PSK modulation type from the list box using the arrow keys, and press ENTER.



4. Press the PSK Type menu button. A list of PSK varieties appears on the screen.

  • PSK
  • BPSK
  • QPSK
  • OQPSK
  • pi/4DQPSK
  • 8PSK
  • 16PSK
  • USER (user-defined)

 

5. Select the required PSK modulation variety from the list box using the arrow keys, and press ENTER.



6. Following your selection, you will be able to configure the characteristics of the modulation with the modulation-type specific menu buttons that appear on the left-hand side of the panel.



TIP
Whenever the arrows icon is displayed there are more attribute menu buttons to be shown below. Simply scroll down using the dial or cursor key.



7. Choose the menu buttons on the left-hand side of the screen to modify any of the following attributes:

  • PSK Data. A table used to program a sequence of phase changes, as explained in step 8. 
  • CW Control. Used to turn the carrier waveform ON or OFF. 
  • CW Frequency. The frequency of the sinusoid carrier waveform.
  • Baud. The rate at which the symbols step through. The rate can be programmed within the range of 0.1 bps to 499 Mbps (when the length of the symbol is a single bit). 
  • Marker. “Marks” an index point in the table at which the Sync Output generates a pulse. 
  • Amplitude. The amplitude of the carrier wave (in Volts peak-to-peak).
  • Offset. The amplitude (in VDC) offset with reference to zero-level amplitude.

 

8. Press the PSK Data menu button to program a sequence of phase changes, as shown below.



Each row in the table includes the following parameters:

  • Line. The index number of the row.
  • Symbol. The PSK data symbol. Each symbol defines a specified phase shift.

 

9. When selecting a numeric attribute for modification, modify the displayed value using the dial or the cursor keys, or by entering the value using the numeric keypad. Press ENTER to save the modified parameter value.



10. Press the Output button in the control menu to configure the output settings.



11. Define the channels in the Output section as being ON or OFF, modifying the settings using the dial or the cursor keys.



TIP
You can quickly modify the output settings by selecting CH1 or CH2 on the keypad, and toggling the OUTPUT key to turn the channel on or off.



12. Select the output path of the channels in the Output Couple section, modifying the settings using the dial or the cursor keys.

  • DC (2Vp-p into 50Ω DC coupled)
  • HV (High-Voltage 4Vp-p into 50Ω DC coupled)
  • AC (-20 to +10 dBm into 50Ω AC coupled)

 

Press ENTER to save the output settings.

 

 

For More Information

To learn more about Tabor’s solutions or to schedule a demo, please contact your local Tabor representative or email your request to info@tabor.co.il

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