On 2011-08-04 7:54 PM, Rajkumar Manoharan wrote:
The Walsh bit is disabled for regulatory consideration.
As per the FCC rulings, only transmissions that are completely
non-coherent, are allowed to waive the array gain contribution
to EIRP for multi-transmit configurations. The use of 2-stream
with 2 transmit and use of 3-steam with 3 transmit qualifies
for this spatial multiplexing MIMO classification as long as
the streams are directly mapped to each radio (not Walsh spread
prior to splitting to multiple radios)
I think ath9k does not waive the array gain contribution. I haven't
checked AR9003, but on AR9002 and older, it explicitly includes the
array gain contribution in the tx power limit calculation. I'm not sure
that unconditionally disabling spatial spreading is the right way to
deal with this.
- Felix
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