[ns] Help for simulating 802.11a data rates

Hi,
Can anyone help me about simulating data rates of 802.11a with their
respective modulation schemes (BPSK, QPSK, QAM)
There are patches available e.g. 802.11Ext and dei80211mr but the
information about them is not enough.
802.11Ext provides limited coding schemes and it has skipped BPSK3/4,
QPSK3/4, 16QAM3/4.
dei80211mr documentation is not available.

Thanks in advance

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Regards