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doc: wifi: Update TX power calculation #19131

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Dec 4, 2024
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doc: wifi: Update TX power calculation #19131

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29 changes: 29 additions & 0 deletions samples/wifi/radio_test/sample_description.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,7 @@ Testing
.. code-block:: console

wifi_radio_test init 11
wifi_radio_test bypass_reg_domain 1
wifi_radio_test tx_pkt_rate 12
wifi_radio_test tx_pkt_len 4000
wifi_radio_test tx_power 4
Expand Down Expand Up @@ -191,6 +192,7 @@ Testing
.. code-block:: console

wifi_radio_test init 14
wifi_radio_test bypass_reg_domain 1
wifi_radio_test tx_pkt_preamble 0
wifi_radio_test tx_pkt_rate 1
wifi_radio_test tx_pkt_len 1024
Expand Down Expand Up @@ -560,8 +562,35 @@ Testing

If ``bypass_reg_domain`` is ``0``, then TX power of the channel will be configured to the minimum value of the user configured TX power value and maximum power supported in the configured regulatory domain.

You can calculate the TX power when ``tx_power`` command is issued, by using the following formula:

.. math::
\begin{aligned}
\text{TX power} = \min \left(P_{\text{rt}} , P_{\text{reg}} \right) - \text{AntGain} - \text{EdgeBackoff}
\end{aligned}

* :math:`P_\text{reg}` is the applicable regulatory power limit, as described in :ref:`ug_nrf70_developing_regulatory_support`.
* :math:`P_\text{rt}` is the power set via the ``tx_power`` command when using Radio Test sample, as described in :ref:`wifi_radio_subcommands`.
* ``AntGain`` is the compensation for the antenna gain in the TX direction, as described in `Antenna gain compensation`_.
``AntGain`` can be set to ``0`` using ``wifi_radio_test set_ant_gain`` command.
* ``EdgeBackoff`` is the backoff applied to band edge channels, as described in `Band edge compensation`_.
``EdgeBackoff`` can be set to ``0`` using ``wifi_radio_test set_edge_bo`` command.

.. note::

If ``bypass_reg_domain`` is ``1``, then user configured TX power value will be set overriding current configured regulatory domain maximum TX power for the channel.

You can calculate the TX power when ``bypass_reg_domain`` is ``1`` and the ``tx_power`` command is issued, by using the following formula:

.. math::
\begin{aligned}
\text{TX power} = P_{\text{rt}} - \text{EdgeBackoff}
\end{aligned}

* To achieve expected TX power ``EdgeBackoff`` should be set to ``0`` before issuing ``tx_power`` command.

To calculate the TX power without issuing ``tx_power`` command, see :ref:`nrf70_wifi_tx_power_calculation`.

.. group-tab:: FICR/OTP programming

* Use the following reference command interface to read or write the OTP params:
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