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3.67Mbps signal 18 miles only 35 mw power - XMAX

 
 
johnny5
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      02-26-2006, 08:39 AM
Does anyone here know more about XMAX?

http://www.howardforums.com/showthread.php?
s=e6e1b576d01b8a6539040c853e441c17&t=837999

xG Technologies pushes ahead with xMax, scores FCC approval

Posted Feb 2nd 2006 1:02PM by Paul Miller
Filed under: Wireless
It's been a while since we've heard anything out of xG Technology,
creator of the xMax wireless standard, but it seems like they're plowing
ahead with their "we don't need no stinkin' WiMax" plan for wireless
technology. In their latest demo they transmitted a 3.67Mbps signal 18
miles using only 35 milliwatts of power, which sticks to their plan of
keeping the power level low enough in transmissions to allow them to
send over occupied frequencies. The FCC just approved the transmitter,
so xG seems well on their way to providing that wireless broadband
everybody's talking about these days, hopefully in the second quarter of
this year. Just to show off, they also used an xMax device to transmit
data 100 feet using 300 nanowatts of power, which compares to 802.11
standards which use three million times more power -- give us some of
that sweet loving!

http://www.xgtechnology.com/
Quote:
Because of its inherent nature xMax can be interleaved among existing
cable RF channels allowing operators to offer new services in an
incremental fashion without the interruption of existing services. Since
xMax can operate over existing network mediums, requiring only new line
end-points, such new services can be added quickly—allowing operators to
increase average revenue per user (ARPU) on a positive cash flow basis.

Quote:
In this respect, xMax is particularly important for telecom firms that
rely on wireline facilities. The higher capacity signals that xMax
produces allows for much higher quality of service (QoS) levels than do
current network standards. In fact, xMax is so robust that signal
capacity improvements to cable networks enable the delivery of over
1,000 channels of enhanced services. In the DSL space, xMax delivers
improved data-rates while increasing the reach of DSL up to an estimated
72,000 ft. from the central office. As such, xMax provides a cost-
efficient avenue for voice, video, and data services into enterprise and
consumer markets


http://www.siliconinvestor.com/readm...2&srchtxt=xmax


Credit Suisse to advise new wireless tech firm
Thu Feb 2, 2006 4:41 AM ET

AMSTERDAM, Feb 2 (Reuters) - U.S.-based company xG Technology, which has
invented a new way to achieve wireless broadband communications, said on
Thursday it had appointed the London office of Credit Suisse (CSGN.VX:
Quote, Profile, Research) as its strategic adviser.

"Recognizing that this opportunity is not U.S.-centric, we chose Credit
Suisse because they exercise global reach for their clients," Chief
Executive Rick Mooers said in a statement.

"They recognized the first-of-the-kind, industry changing aspects of
XMAX (xG's technology)," he added.

Credit Suisse will help xG in discussions with big telecoms
infrastructure vendors who are being approached to help the company
boost its presence across the world.

"They may even be acquired by a company, potentially," a spokesman in
London said.

New wireless technology can be a lucrative business. The inventors of
another new wireless technology, a company called Flarion, which
invented Flash OFDM, was bought for $600 million by CDMA cell phone
innovators Qualcomm (QCOM.O: Quote, Profile, Research) in August 2005.
An initial public offering of xG is not on the cards.

The company has come up with a radical new method to transmit large
amounts of data over the air using very little power, which enables it
to trespass on radio spectrum that is already being used, for instance
by radio or TV channels, without disturbing these signals.

In the past week xG said its equipment was tested by a lab compliant
with U.S. Federal Communications Commission standards.

Separately, an XMAX unit was used to transmit full motion video over a
distance of 100 feet using 300 nanowatts of transmitted power. Had that
same signal been transmitted with existing Wi-Fi wireless broadband
technology, it could have required up to 3 million times more power,
said Joe Bobier, who invented the XMAX Technology. The technology can be
used to transmit and detect signals over distances of several
kilometres.

Mooers said XMAX products would be ready for market by the end of the
second quarter of 2006.
 
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Jeff Liebermann
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      02-26-2006, 04:49 PM
johnny5 <(E-Mail Removed)> hath wroth:

>Does anyone here know more about XMAX?


Not me. I don't understand how it works. How single cycle wavelet
modulation operates is beyond my limited abilities. Show me some
formula, calcs, demos, and circuitry, and I'll understand.

Various magazines had articles with a bit more history and techy
details. Note that these are all essentially press releases from the
XMax/XGtechnology company:
http://mrtmag.com/mag/radio_good_true/
http://mrtmag.com/news/intheworks/Bo...G_xMax_091205/
http://www.commsdesign.com/showArtic...leID=178601074

http://www.wirelessnetdesignline.com...leID=163103775
However, other than variations on the above articles, I've seen
nothing in any of the other RF related publications such as:
http://www.wirelessdesignmag.com
http://www.rfdesign.com
http://www.commsdesign.com
where the RF designers (and adopters) read about new technologies.

There's also nothing in the IEEE Transactions on Wireless Comm, which
tends to have articles on breaking technologies well before the trade
press. This is despite the large number of academics and PHD's on the
XGTechnology staff and acting as advisors. I would have expected a
theoretical analysis, possibly with peer review. Nothing.
http://www.comsoc.org/pubs/jrnal/twc.html
Actually, I'm not sure if there are any publications as the search
engine is down for maintance. I'll check again later.

I'm always open to new ideas, but am very suspicious of a company that
has announce earth shaking technology, but has only managed to produce
2 public demonstrations with absolutely nothing on their web pile
showing the system in action or equipment that was used. Both had the
press in attendence, but photos? It's certainly important to protect
their patent position, but this is rediculous.

I'm suspicious, but it's too important a technology to prounounce
judgement at this time.

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
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johnny5
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      02-26-2006, 11:19 PM
Jeff Liebermann <(E-Mail Removed)> wrote in
news:(E-Mail Removed):


> I'm suspicious, but it's too important a technology to prounounce
> judgement at this time.


I am suspicious too - have you looked at thier patent filings? Perhaps
there is something to be gleened there? The head of the company was
involved in some lawsuit with some nordic investors. Something about
scamming thier pension.

http://www.siliconinvestor.com/readr...msgid=21856813
&nonstock=False&subjectid=8007

Here is a page showing 4 links to thier patents. All greek to me.
 
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Jeff Liebermann
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      02-27-2006, 01:18 AM
johnny5 <(E-Mail Removed)> hath wroth:

>Jeff Liebermann <(E-Mail Removed)> wrote in
>news:(E-Mail Removed) :
>> I'm suspicious, but it's too important a technology to prounounce
>> judgement at this time.


>I am suspicious too - have you looked at thier patent filings?


Nope. But I will.

>Perhaps
>there is something to be gleened there?


>The head of the company was
>involved in some lawsuit with some nordic investors. Something about
>scamming thier pension.
>
>http://www.siliconinvestor.com/readr...subjectid=8007
>
>Here is a page showing 4 links to thier patents. All greek to me.


I'll look at those tonight. Beats watching TV.
| http://patft.uspto.gov/netacgi/nph-P...r+AND+wireless
| http://patft.uspto.gov/netacgi/nph-P...r+AND+wireless
| http://patft.uspto.gov/netacgi/nph-P...r+AND+wireless
| http://patft.uspto.gov/netacgi/nph-P...r+AND+wireless

Meanwhile, something that's not exactly greek. On their web pile,
XGTechnology shows a BER (bit error rate) to S/N ration plot.
http://www.xgtechnology.com/BER_performance.asp
Somehow, this is suppose to demonstrate "Performance". It doesn't.
The way this graph works is that it's a measure of spectrum
efficiency. Missing is QAM-??, BPSK and QPSK which are the basic
modulation types for Wi-Fi. Well, BPSK is somehow mixed with CDMA,
which isn't even close.

Sensitivity is measured at a fixed BER, usually 1*10^-5. If the graph
is actually correct, then xMax modulation has a -0.5dB "benifit" over
BSPK (my guess is BPSK-8) which makes it LESS sensitive. If Xmax
reall does offer a substantial range improvement, it has to do it by
improving the S/N ratio at the reference BER. Otherwise, range for
BPSK and xMax will be almost identical.

Another thing I just noticed is the symbols along the curve. I've
done BER vs S/N measurements like these on the bench. The data point
NEVER end up exactly on the curves. To me, that means they never made
the measurements. Instead, it looks almost exactly like the curves
from an old Intersil Prism 1 data sheet.
| http://www.sss-mag.com/pdf/an9804.pdf
See figure 4. It's not the one I'm thinking of, but it's close. I
have a printed copy from the WECA versus CUBE pissing match before the
FCC when WECA (Wi-Fi) was trying to get 802.11g approved at the
expense of HomeRF. The graph in this printout is almost exactly the
same as the one on the XGTechnology web pile. I'll dig some more
later.

Dinner on fire. More later...

--
Jeff Liebermann (E-Mail Removed)
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 
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0594shoe
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