RE: ANNOUNCE: Linux UWB and Wireless USB project

RE: ANNOUNCE: Linux UWB and Wireless USB project

[Perez-Gonzalez, Inaky]

>From: Pavel Machek [mailto:pavel@ucw.cz]
>
>> Intel is pleased to announce the launch of a project to
>> implement Linux kernel support for upcoming hardware that
>> complies with the WiMedia Ultra Wide Band (UWB) and Wireless
>> USB standards.
>
>Does wireless usb also supply power as wired USB does? ;-)

Hmmm...business idea :)

>> UWB is a high-bandwidth, low-power, point-to-point radio
>> technology using a wide spectrum (3.1-10.6HGz).  It is
>
>How much power is low power?

For what I know (and I could be wrong) max is around -40dBm/MHz 
in the US. I am no expert in the nitty-gritty radio details, but 
I've been told that is 3000 times less emissions than a common 
cellphone, around .1 uW? [this is where my knowledge about radio
*really* fades].

>> You are welcome to contribute!
>
>Is there any hardware available?

I think some companies are starting to make PDKs available this
summer, but YMMV.

-- Inaky

RE: ANNOUNCE: Linux UWB and Wireless USB project

[Alan Cox]

Ar Llu, 2006-06-05 am 13:31 -0700, ysgrifennodd Perez-Gonzalez, Inaky:
> For what I know (and I could be wrong) max is around -40dBm/MHz 
> in the US. I am no expert in the nitty-gritty radio details, but 
> I've been told that is 3000 times less emissions than a common 
> cellphone, around .1 uW? [this is where my knowledge about radio
> *really* fades].

Life is never that simple. The total emissions of UWB are pretty low but
their spread across the wide frequency range makes them incredibly low
on any frequency - so very unlikely to interfere.

The total emissions across the set of frequencies as a sum (with
emphasis on some frequency ranges such as 2.4-2.5GHz) apparently matters
much more than the emissions at one frequency for things like human
exposure.

Alan

Re: ANNOUNCE: Linux UWB and Wireless USB project

[Pavel Machek]

> >> UWB is a high-bandwidth, low-power, point-to-point radio
> >> technology using a wide spectrum (3.1-10.6HGz).  It is
> >
> >How much power is low power?
> 
> For what I know (and I could be wrong) max is around -40dBm/MHz 
> in the US. I am no expert in the nitty-gritty radio details, but 
> I've been told that is 3000 times less emissions than a common 
> cellphone, around .1 uW? [this is where my knowledge about radio
> *really* fades].

Common cellphones are 2W, iirc; (so it would be ~1mW) but I was more
interested in system power consumption. WIFI is too power intensive
for a cellphone (mostly). Is this designed to go into cellphones?
notebooks?

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: ANNOUNCE: Linux UWB and Wireless USB project

[Mark Lord]

Pavel Machek wrote:
>
> Common cellphones are 2W, iirc; (so it would be ~1mW) but I was more
> interested in system power consumption. WIFI is too power intensive
> for a cellphone (mostly). Is this designed to go into cellphones?
> notebooks?

Most mobile phones in North America typically max out at 0.5W,
and spent much of the time operating in the uW - mW txpower range.

I've forgotten the specs for GSM in Europe.

Cheers

Re: ANNOUNCE: Linux UWB and Wireless USB project

[Pavel Machek]

On Út 06-06-06 10:02:55, Mark Lord wrote:
> Pavel Machek wrote:
> >
> >Common cellphones are 2W, iirc; (so it would be ~1mW) but I was more
> >interested in system power consumption. WIFI is too power intensive
> >for a cellphone (mostly). Is this designed to go into cellphones?
> >notebooks?
> 
> Most mobile phones in North America typically max out at 0.5W,
> and spent much of the time operating in the uW - mW txpower range.
> 
> I've forgotten the specs for GSM in Europe.

2W max on 900MHz, and 1W max on 1800MHZ, IIRC. Yes, they can go down
on good signal.

But power that goes out of the antena is not the only power
spent... GSM phones have about 5hours theoretical talk time on ~3.6Wh
battery. That means they eat around ~.5W in the best case.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [linux-usb-devel] ANNOUNCE: Linux UWB and Wireless USB project

[David Brownell]

On Monday 05 June 2006 1:31 pm, Perez-Gonzalez, Inaky wrote:
> >From: Pavel Machek [mailto:pavel@ucw.cz]
> >
> >Is there any hardware available?
> 
> I think some companies are starting to make PDKs available this
> summer, but YMMV.

Actually ISTR the WUSB team at www.usb.org had press releases talking
about rather bulky PDK + radio kits last winter.  Since then I think
I've heard about at least four teams working on Real Silicon (and I'm
not in those loops at all, so I believe there must be others).

At one point I saw diagrams showing UWB as the platform over which
USB, Bluetooth, Firewire, and network peripheral models would get
layered.  Home mesh networking, anyone?

The notion of authenticating peripherals to Linux will take a bit of
getting used to, I expect ... that's part of the wireless USB model.
RSA and private key management will be getting a bit of a workout...

- Dave