About OFDM Markers (802.11a/g/j/p OFDM)

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. demodulators have trace data that use three-dimensional data--that is, the data results include x-axis, y-axis, and z-axis components. Marker readouts for these displays provide data results for the x-, y-, and z-axes. In general, marker movement and operation is similar to the typical two dimensional trace data displays with the added capability to position the marker on the z-axis component.

Some of the available three-dimensional trace data include OFDM Error Vector Spectrum, OFDM Error Vector Time, OFDM IQ Meas, and OFDM IQ Ref trace data. For these displays notice that marker positions have both an X-axis and Z-axis position and that marker readouts show three position values (X, Y, and Z-axis positions).

To learn more about the OFDM traces for a specific demodulator, select the trace data topic for the demodulator from Optional Measurement Software Trace Data topic.

For information about how to specify a Z-axis marker position see Z Position.

For information about how to use Z-axis marker search features see Marker Search and Marker Shortcuts.

Marker readouts reflect the X-axis, Y-axis, and Z-axis values for the selected marker position. For trace data that does not have Z-axis data results, the Z Position parameter is greyed and the Z-axis marker readout is not shown.