Question on tx-power and number of chains.

[Ben Greear <greearb@candelatech.com>]

Suppose a NIC wants to decrease TX power for certain rates based on the
number of chains (ie, subtract amount A from requested rate for 2 chains,
and B for 3 chains).

I assume the NIC wants to do this is because if the pkt is transmitted out each antenna,
then there is ~3x the power put onto the air.

Now, the question is, should this power-decrease be per rate,
and perhaps different for each rate, or can all rates use all
tx-chains (and so tx-power should be decreased the same maximum amount
based on the hardware's number of chains for each rate).

I am thinking that CCK rates can only ever be transmitted by a single
chain, so in that case those rates would not need their power decreased
from the requested?

And if that is so, what about the /a/g/ rates, and lower-speed HT/VHT
rates as well?

Is there a table somewhere that explains how many chains are used by each
rate?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com