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wifi: Extend documentation about current MU-MIMO PHY support

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Sébastien Deronne
2023-12-27 11:45:18 +01:00
committed by Tom Henderson
parent 538ecd1f74
commit ef24207f1e
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src/wifi/doc/source/wifi-design.rst
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@@ -773,6 +773,25 @@ which would be ignored otherwise. This is illustrated in Figure :ref:`fig-cca-ch
Illustration of signals tracking upon channel switching
MU-MIMO PHY support
###################
There is a basic support for MU-MIMO at the PHY layer that has been introduced in release
ns-3.40. The current model can be used for both downlink and uplink MU-MIMO transmissions.
The use of OFDMA and MU-MIMO for Multi-User transmissions depends on how the TXVECTOR
is filled in by the MAC layer (not implemented yet). Since mixed OFDMA and MU-MIMO
configurations are not supported, the TXVECTOR determines it carries information for
MU-MIMO if all users are assigned the same RU, otherwise it corresponds to an OFDMA
transmission.
At the PHY layer, OFDMA and MU-MIMO transmissions are handled in a similar way, the main difference
lies in MU-MIMO having the same spectrum shared simultaneously with multiple transmitters (for
the uplink direction). The current PHY abstraction model assumes perfect conditions where the
interference helper is able to detect signals belonging to the same MU-MIMO transmission and make
sure they do not interfere with each others. Interference with other signals, including other
MU-MIMO transmissions, is still supported by the model.
The MAC model
=============