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Can radio frequencies operation in full duplex mode?

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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noci

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).
If you are talking about standard WiFi connections, it is a polled network with half-duplex operation.
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noci

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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?
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Thank you all.