[ath9k-devel] Fixing the rate and rate relationship to OFDM

[Alex Hacker <hacker@epn.ru>]

Hi,
If you able to add small piece of code to the driver, you can do the following:
Construct a single aggregate with desired parameters, NoAck bit set and 1 retry
count in the first retry series. Link last descriptor of the aggregate to the
first and drop this bomb into any TX queue. The aggregate should be in
accordance with the 802.11n, i.e. contain <64K of data+delimeters+FCS and be
4ms or shorter.
In case when no other signals in the medium this gives you 100% transmit time
except the small silence periods required by the standard.

But IMO, measuring TX power with a SA is not the best way. Using a much cheaper
power meter set up to measure on first 16us of each packet (preamble) is better.
It allows you to get a valid result with single packet shot.

About modulations used in 11n:
MCS			Modulation
0,8,16			BPSK
1,2,9,10,17,18		QPSK
3,4,11,12,19,20		QAM16
5,6,7,13,14,15,21,22,23	QAM64

52 subcarriers in 20MHz bandwidth and 108 in 40MHz.

Regards,
Alex.