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wifi: Update documentation related to OFDM transmit spectrum masks when using SpectrumWifiPhy model

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Sébastien Deronne
2018-06-09 11:13:37 +02:00
parent ee01c0ccd6
commit b839d38cfe
1 changed files with 5 additions and 11 deletions
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src/wifi/doc/source/wifi-design.rst
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@@ -454,18 +454,12 @@ To support the Spectrum channel, the ``YansWifiPhy`` transmit and receive method
were adapted to use the Spectrum channel API. This required developing
a few ``SpectrumModel``-related classes. The class
``WifiSpectrumValueHelper`` is used to create Wi-Fi signals with the
spectrum framework and spread their energy across the bands. The
spectrum is sub-divided into 312.5 kHz sub-bands (the width of an OFDM
subcarrier). The power allocated to a particular channel
spectrum framework and spread their energy across the bands. The
spectrum is sub-divided into sub-bands (the width of an OFDM
subcarrier, which depends on the technology). The power allocated to a particular channel
is spread across the sub-bands roughly according to how power would
be allocated to sub-carriers using an even distribution of power and
assuming perfect transmit filters. This could be extended in the
future to place power outside of the
channel according to the real spectral mask. This should be
done for future adjacent channel models but is not presently implemented.
Similarly, on the receive side, a receiver filter mask can be defined;
for this initial implementation, we implemented a perfect brick wall
filter that is centered on the channel center frequency.
be allocated to sub-carriers. Adjacent channels are models by the use of
OFDM transmit spectrum masks as defined in the standards.
To support an easier user configuration experience, the existing
YansWifi helper classes (in ``src/wifi/helper``) were copied and