Re: [SOCALWUG] Parkervision cards

[Jim Thompson]

no, Parkervision's D2D is basically a super direct-conversion radio and 
over-sampling.  At least, thats the way I understand it.

Airgo is MIMO.   Not a very good MIMO as these things go.  Not, what 
could we say, "respected" in
the MIMO community.

Jim
On Nov 9, 2004, at 10:33 PM, Humphrey Cheung wrote:
I'm not that technical in the specs or antenna construction... so bear 
with
me.

Is there anything that suggests that Parkervision is MIMO??  Or is 
that our
assumption?

Humphrey
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On 
Behalf
Of Jim Thompson
Sent: Tuesday, November 09, 2004 7:47 PM
To: [EMAIL PROTECTED]
Subject: Re: [SOCALWUG] Parkervision cards

On Nov 9, 2004, at 1:21 PM, Richard B wrote:
Here's how...
http://www.nwfusion.com/details/6830.html
My first thought was "voodo" or something - but thinking about it, it
still seems like some kind of magic!
No, its just math.   But that doesn't explain how they go 3X the
distance to an ordinary 802.11x unit
on the other end of the link.
Maybe they use their 3 antennas to do a combining/beam-forming thing.
But, as I said, there are problems with that too.
The ability to turn multi-path into multi-good-path seems
kinda...weird.
but thats how MIMO works.   (Thus my "tell me about the range increase
in LOS conditions" trick question.)
jim
kd5fga
Richard,
NCT
N6GPP

----Original Message Follows----
From: Jim Thompson <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: [SOCALWUG] Parkervision cards
Date: Tue, 9 Nov 2004 08:33:11 -1000
how?
On Nov 9, 2004, at 7:45 AM, Shawn Rogers wrote:
Actually, at least with Airgo's MIMO technology (Belkin/SOHOWare), a
MIMO PCMCIA card will get better range than a standard 802.11g card
when connecting to a standard 802.11g AP.  Same when using a MIMO AP
with a standard card vs a standard AP with a standard card.
-----Original Message-----
From: Jim Thompson [mailto:[EMAIL PROTECTED]
Sent: Monday, November 08, 2004 5:39 PM
To: [EMAIL PROTECTED]
Subject: Re: [SOCALWUG] Parkervision cards
On Nov 8, 2004, at 3:06 PM, Jerry Roy wrote:
Humphrey,
This is the best card I have in my whole pile. Wouldn't trade it 
for
anything else.

It blew me away. You have to combine with their AP/Router
to really see
what it can do. Impressive.
Of course you do.   If the card sends MIMO to an ordinary AP, the AP
will only 'see' (hear?) garbage, and visa versa.
Now then, tell us how you get 3X range in a LOS environment, and ...
"3X compared to what, and in what type of environment, and at
what throughput/rate?"
Its MIMO, not Magic.
Jim
Jerry
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Humphrey Cheung
Sent: Monday, November 08, 2004 11:01 AM
To: [EMAIL PROTECTED]
Subject: [SOCALWUG] Parkervision cards
Hello,
Anyone have experience with the Parkervision wifi cards?
They claim no
deadspots in your house, etc etc.
We thought it was voodoo, so we asked for a review unit... I'll be
damned I
get triple the range.  I'll try a wardrive today with the card.
Humphrey Cheung
Editor - Tomshardware

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