<p dir="ltr">You do that in hardware. Do the Mac, phy and RF in hardware.</p>
<p dir="ltr">This is what the qca hardware does.<br></p>
<p dir="ltr">a</p>
<div class="gmail_quote">On Mar 13, 2016 5:25 PM, "David Lang" <<a href="mailto:david@lang.hm">david@lang.hm</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sat, 12 Mar 2016, Adrian Chadd wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 12 March 2016 at 11:14, Henning Rogge <<a href="mailto:hrogge@gmail.com" target="_blank">hrogge@gmail.com</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On Sat, Mar 12, 2016 at 3:32 PM, Wayne Workman<br>
<<a href="mailto:wayne.workman2012@gmail.com" target="_blank">wayne.workman2012@gmail.com</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I understand that Broadcom was paid to develop the Pi, a totally free board.<br>
<br>
And they already make wireless chipsets.<br>
</blockquote>
<br>
The question is how easy would it be to build a modern 802.11ac<br>
halfmac chip... the amount of work these chips do (especially with 3*3<br>
or 4*4 MIMO) is not trivial.<br>
</blockquote>
<br>
It's not that scary - most of the latency sensitive things are:<br>
<br>
* channel change - eg background scans<br>
* calibration related things - but most slow calibration could be done<br>
via firmware commands, like the intel chips do!<br>
* transmit a-mpdu / retransmit<br>
* transmit rate control adaptation<br>
* receiving / block-ack things - which is mostly done in hardware anyway<br>
* likely some power save transition-y things too<br>
</blockquote>
<br>
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.<br>
<br>
But it's one of the most valuable features in the spec.<br>
<br>
David Lang<br>
</blockquote></div>