On Sun, 13 Mar 2016, Adrian Chadd wrote:
You do that in hardware. Do the Mac, phy and RF in hardware.
This is what the qca hardware does.
unfortunantly, that's not what the existing chipsets do.
So unless you can create a new chipset, you can't just change what's done in
hardware.
David Lang
a
On Mar 13, 2016 5:25 PM, "David Lang" <[email protected]> wrote:
On Sat, 12 Mar 2016, Adrian Chadd wrote:
On 12 March 2016 at 11:14, Henning Rogge <[email protected]> wrote:
On Sat, Mar 12, 2016 at 3:32 PM, Wayne Workman
<[email protected]> wrote:
I understand that Broadcom was paid to develop the Pi, a totally free
board.
And they already make wireless chipsets.
The question is how easy would it be to build a modern 802.11ac
halfmac chip... the amount of work these chips do (especially with 3*3
or 4*4 MIMO) is not trivial.
It's not that scary - most of the latency sensitive things are:
* channel change - eg background scans
* calibration related things - but most slow calibration could be done
via firmware commands, like the intel chips do!
* transmit a-mpdu / retransmit
* transmit rate control adaptation
* receiving / block-ack things - which is mostly done in hardware anyway
* likely some power save transition-y things too
you are ignoring MU-MIMO, the ability to transmit different signals from
each antenna so that the interference patterns from the different signals
result in different readable data depending on where the receiver is in
relation to the access point is not a trivial thing.
But it's one of the most valuable features in the spec.
David Lang
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