Tracking Mode (802.11n/ac/ax/be)
Tracking Mode determines where the Pilot Tracking occurs.
Typically, if the phase noise is primarily caused by the receiver rather than the transmitter, it's beneficial to select Pre EQ and do pilot tracking before the equalizer. If the phase noise primarily comes from the transmitter and the phase noise from the receiver is minimal, select Post EQ. Try both, look at the EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. and use the one that gives the best result.
The choice of tracking mode is generally related to hardware architecture in the transmitter and receiver. For square MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. signals like 2x2 or 4x4, if individual oscillators are deployed in the transmitter while phase noise is coherent in the receiver, Post EQ is recommended. Otherwise, Pre EQ is preferred.
- : Post EQ tracks and removes the phase noise after the equalizer and is the default Tracking Mode.
- : Traditional single channel modulation
always had the phase tracked after the equalizer. With
multiple data streams, that may not be the best place to do it. If
the phase noise is being generated by the receiver, the signal after the
equalizer has a mixture of phase noise from the two oscillators. Because
of this mixing, it is difficult to track the phase noise after applying
the equalizer. The
Pre EQ tracking algorithm tracks and removes the phase noise before the
equalizer.
MIMO EQ on Pilot (802.11 n/ac only)
Chan EQ on Pilot (802.11 n/ac only)
See Also
802.11n/ac/ax/be Demod Properties
