OFDM RU Info (802.11n/ac/ax/be)

OFDM RU Info is a table with information about all the M/RUs detected in the burst.

The following information is listed for each M/RU:

EVM(dB) - Average error vector magnitude of the M/RU
Subcarrier(Start) - start subcarrier index of the M/RU
Subcarrier(Stop) - stop subcarrier index of the M/RU
Size- size of the M/RU (number of tones)
Pwr(dBm) - absolute power for each M/RU, averaged over input channels.
UnusedToneEVM(dB) - relative power between an unoccupied 26-tone RU and the occupied RU computed across all symbols. This value is referred to as UnusedToneErrorRMS(k) in equation (28-120) of Draft P802.11ax D1.2 and equation (36-103) of Draft P802.11be D1.1.
Limit(dB) - staircase mask requirement for average unoccupied subcarrier error vector magnitude for each unoccupied 26-tone RU, which is configured using the Unused Tone Mask settings. This value is referred to as UnusedToneErrorRMS(m) in equation (28-123) of Draft P802.11ax D1.2 and equations (36-106) and (36-107) of Draft P802.11be D1.1.
Margin(dB) - difference between UnusedToneEVM(dB) and Limit.

Trace Color coding Scheme

A multi-color coding scheme is used to make it easy to visually identify data results within various OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. Traces. This makes cross trace data comparisons and analysis easier to accomplish.

The 802.11n/ac/ax/be color scheme has been optimized to help make visual sense of complex standards. The default color assignment for 802.11n/ac/ax/be follows these general guidelines:

802.11ax/be
- Traces that contain M/RU data (OFDM RU Info, OFDM Multi-User Info) use Keysight standard colors to uniquely color code up to 48 different M/RUs.

You can also customize and re-assign Trace colors schemes, see the Display Preferences Color tab (click Utilities > Display Preferences > Color tab and select a new color for the active Group element).