Can radio frequencies operation in full duplex mode?

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Can radio frequencies operation in full duplex mode?
My question is based on the following text: "In a network where WMM is supported by both the access point and the client device, traffic generated by time-sensitive applications such as voice or video can be prioritized for transmission on the half-duplex RF medium. "
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nociSoftware Engineer
Distinguished Expert 2018

Commented:
Yes and No....

Within one channel it cannot (and neighbouring channels may bleed.(cross-talk)..).

When there are separate carrier channels available for Sending/Receiving... then full duplex can be done (and in fact is done).
(Same holds for cables, they have 2 lead-pairs, one for sending and one for receiving).
Dave BaldwinFixer of Problems
Most Valuable Expert 2014

Commented:
If you are talking about standard WiFi connections, it is a polled network with half-duplex operation.
Software Engineer
Distinguished Expert 2018
Commented:
That is because of the use of only one channel per AP.  If you COULD connect with AP-> mobile with Channel 1 and Mobile -> AP with channel 5 then it can be full duplex.  (so it requires A transmitter & receiver that are tuned to different channels on BOTH sides.
With standard WiFi communication between  AP<-> Mobile using only one channel.  And both sides only have one send/receiver unit so switching roles from sender -> receiver -> sender ... makes it Half Duplex.  If both are sending at the same time the interference would destroy any signal for any other party.

It might be worthwile to study the case of the ALOHA network, wich eventualy became Ethernet. (Ethernet at start was a Wired equivalent to a radio packet network called ALOHA, using COAX-cable to connect stations. This later became Bridges & Repeaters, then Multiport Repeaters  which eventualy became Hubs. Then UTP was introduced and The Hubs became Switches, from the 100Mbps networks standards onward Full Duplex became available, some manufacturers backported it to 10Mbps as well).
wireless multi media  communication  in full duplex mode future research topic. in the mean time,Multi-Input Multi-Output
 (M I M O),Orthogonal Frequency Division Multiplexing  (O F D M) is possible solution for  nowadays.
OK?
M

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Commented:
Thank you all.

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