On Thu, 23 Jun 2016, dpr...@reed.com wrote:
The actual issues of transmitting on multiple channels at the same time are
quite minor if you do the work in the digital domain (pre-DAC). You just need
a higher sampling rate in the DAC and add the two signals together (and use a
wideband filter that covers all the channels). No RF problem.
that works if you are using channels that are close together, and is how the
current standard wide channels in N and AC work.
If you try to use channels that aren't adjacent, this is much harder to do.
Remember that the current adjacent channel use goes up to 160MHz wide, going
wider than that starts getting hard.
Receiving multiple transmissions in different channels is pretty much the same
problem - just digitize (ADC) a wider bandwidth and separate in the digital
domain. the only real issue on receive is equalization - if you receive two
different signals at different receive signal strengths, the lower strength
signal won't get as much dynamic range in its samples.
But in a LAN setup, the variability in signal strength is likely small enough
that you can cover that with more ADC bits (or have the MAC protocol manage
the station transmit power so that signals received at the AP are nearly the
same power.
Equalization at transmit works very well when there is a central AP (as in
cellular or normal WiFi systems).
define 'normal WiFi system'
It's getting very common for even moderate size houses to need more than one AP
to cover the entire house.
David Lang
On Thursday, June 23, 2016 4:28pm, "Bob McMahon" <bob.mcma...@broadcom.com>
said:
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An AP per room/area, reducing the tx power (beacon range) has been my
approach and has scaled very well. It does require some wires to each AP
but I find that paying an electrician to run some quality wiring to things
that are to remain stationary has been well worth the cost.
just my $0.02,
Bob
On Thu, Jun 23, 2016 at 1:10 PM, David Lang <da...@lang.hm> wrote:
Well, just using the 5GHz DFS channels in 80MHz or 160 MHz wide chunks
would be a huge improvement, not many people are using them (yet), and the
wide channels let you get a lot of data out at once. If everything is
within a good range of the AP, this would work pretty well. If you end up
needing multiple APs, or you have many stations, I expect that you will be
better off with more APs at lower power, each using different channels.
David Lang
On Thu, 23 Jun 2016, Bob McMahon wrote:
Date: Thu, 23 Jun 2016 12:55:19 -0700
From: Bob McMahon <bob.mcma...@broadcom.com>
To: Dave Taht <dave.t...@gmail.com>
Cc: make-wifi-f...@lists.bufferbloat.net,
"cerowrt-devel@lists.bufferbloat.net"
<cerowrt-devel@lists.bufferbloat.net>
Subject: Re: [Make-wifi-fast] more well funded attempts showing market
demand
for better wifi
hmm, I'm skeptical. To use multiple carriers simultaneously is difficult
per RF issues. Even if that is somehow resolved, to increase throughput
usually requires some form of channel bonding, i.e. needed on both sides,
and brings in issues with preserving frame ordering. If this is just
channel hopping, that needs coordination between both sides (and isn't
simultaneous, possibly costing more than any potential gain.) An AP only
solution can use channel switch announcements (CSA) but there is a cost to
those as well.
I guess don't see any break though here and the marketing on the site
seems
to indicate something beyond physics, at least the physics that I
understand. Always willing to learn and be corrected if I'm
misunderstanding things.
Bob
On Wed, Jun 22, 2016 at 10:18 AM, Dave Taht <dave.t...@gmail.com> wrote:
On Wed, Jun 22, 2016 at 10:03 AM, Dave Taht <dave.t...@gmail.com> wrote:
https://www.kickstarter.com/projects/portalwifi/portal-turbocharged-wifi?ref=backerkit
"Portal is the first and only router specifically engineered to cut
through and avoid congestion, delivering consistent, high-performance
WiFi with greater coverage throughout your home.
Its proprietary spectrum turbocharger technology provides access to
300% more of the radio airwaves than any other router, improving
performance by as much as 300x, and range and coverage by as much as
2x in crowded settings, such as city homes and multi-unit apartments"
It sounds like they are promising working DFS support.
It's not clear what chipset they are using (they are claiming wave2) -
but they are at least publicly claiming to be using openwrt. So I
threw in enough to order one for september, just so I could comment on
their kickstarter page. :)
I'd have loved to have got in earlier (early shipments are this month
apparently), but those were sold out.
https://www.kickstarter.com/projects/portalwifi/portal-turbocharged-wifi/comments
--
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org
--
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org
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