Trigger-based (TB) PPDU in 802.11ax, 802.11be or 802.11bn is transmitted in response to a trigger frame. The trigger frame allocates resources and carries the information required to construct a TB PPDU. Hence, the TB PPDU header does not contain Resource Unit (RU), Modulation and Coding Scheme (MCS), and guard interval information. You must configure RU and MCS for performing a ModAcc measurement.

The key results of this measurement are Composite RMS EVM Mean, Frequency Error Mean, Frequency Error CCDF 10%, Symbol Clock Error Mean, and Unused Tone Error Margin. When you set the OFDM Header Decoding Enabled property to True, you must configure the following properties:

  • MCS Index
  • RU Size
  • RU Offset/MRU Index
  • RU Type
  • Distribution Bandwidth (Hz)
  • Guard Interval Type
  • LTF Size
  • PE Disambiguity
  • Space Time Stream Offset
  • 2xLDPC Enabled
  • Number of HE-LTF Symbols
  • MU-MIMO LTF Mode Enabled