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Macroblocker
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Re: Modulation marches forward
Macroblocker   12/28/2013 8:11:32 AM
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Does this company check out?  Is it based in the USA or Israel?

It looks like it's owned by Yossi Cohen and Amir Eliaz.

A possible address for the company came up as a residential address on Upper Vintage Rd in Laguna Niguel, California, 92677.




Bert22306
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Re: Modulation marches forward
Bert22306   12/26/2013 6:12:00 PM
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Good point on the more lenient BER criterion. That's enough to make comparisons invalid. Still, the BER does tend to drop rather quickly at the limit. So it may not make a huge difference.

Bert22306
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Re: Modulation marches forward
Bert22306   12/26/2013 6:06:48 PM
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"I believe they were suggesting 10dB could be translated into higher data rates, lower power consumption or longer distances, not all three at once."

Well, perhaps the "power consumption" angle adds enough ambiguity to let this otherwise unsupportable claim slide. Perhaps. I'd have to do a survey to tell for sure. As to distance (SNR actually, combined with receiver noise), data rate, and channel bandwidth, that *is* the tradeoff made by Shannon's equation. Either all thee together, or fix two and vary only one, or fix one and vary only two, makes no difference. That's why the claim sounds wrong.

This sort of truth bending happens all the time. In an interview I heard on a supposedly revolutionary engine design, the interviewee implied that his engine's efficiency was way higher than the norm because it had a lot more "working area" than standard piston engines.

Too bad the interviewer didn't think to ask, "What does working area have to do with efficiency? It's all about compression ratio. Tell me your engine has higher compression ratio, and I might start to believe. And then I'll ask, how do you prevent detonation?" The problem is just accepting as fact the implied significance of some irrelevant measurement.

These claims of supposed "breakthroughs" are very rarely credible.

Bert22306
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Re: Modulation marches forward
Bert22306   12/26/2013 5:46:07 PM
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Uuuh, more like truth gets stretched.

If existing modulation and error correction schemes get well withing 3 dB of the Shannon limit, it makes no sense to annonce that some new scheme is 10 dB better!

dt_hayden
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Re: Modulation marches forward
dt_hayden   12/24/2013 11:48:17 AM
Elsissi - See the list of 15 published patents I posted already.  I have not had time to review them much, I am starting with 8,526,523.

One thing that does stand out is the new transmission method uses a metric of 10^-1 to 10^-3 symbol error rate which seems in stark contrast to the 10^-6 metric normally applied to BER for data transmissions.

It is also astounding to me that these patent applications could be filed in Jan 2013 and granted in Sept 2013, for what is claimed to be a revolutionary technology.  There is a lot to take in for anyone, patent examiners included.

rick merritt
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Re: Modulation marches forward
rick merritt   12/24/2013 11:33:04 AM
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@sridhar: I believe they were suggesting 10dB could be translated into higher data rates, lower power consumption or longer distances, not all three at once.

rick merritt
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Re: Modulation marches forward
rick merritt   12/24/2013 11:29:43 AM
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@elsissi: I invite you to do the Google patent search on the name of the CTO Amir Eliaz yourself and you will see 14 issued patents.

As for unsupported superlatives: I invite you to puncture holes in anything you see in the story or the patents. But please be specific.

elsissi
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Re: Modulation marches forward
elsissi   12/21/2013 1:02:21 PM

This article and many similar others in the press in the last week, is an example of what you get when you have a marginally good idea and a lot of money to spend on unsubstantiated PR. There is only ONE patent issued in the company name and several applications (not patents). The patent describe a partial signaling transmitted and a maximum likelihood receiver implementation. It is NOT as claimed in the article which strung together all sorts of unsupported superlatives. What a shame!!

BOMBOVA
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Re: Modulation marches forward
BOMBOVA   12/21/2013 12:03:15 PM
n Physics, gets streached,    the disbelievers,  speak up.   

y_sasaki
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Re: Modulation marches forward
y_sasaki   12/19/2013 4:46:49 PM
@ick merritt,

I personally believe 11ac 256QAM is already pushing little bit too far.

As Shannon's equasion (C=Blog2(1+S/N) suggests, the straightforward way to increase datarate (C) is to use more bandwidth (B). This was tried and failed on UWB (initially 500MHz/channel, hoped more than 5GHz/channel for future), partly applied to 11ac (up to 160MHz/channel).

Using higher frequency natunally increase bandwidth/channel, so there is high hope we can achieve more than 1Gbps datarate at 60GHz freq (802.11ad), however its laser-beam like characteristics and extremely low penetoration capability (you only can use 60GHz in clear line-of-sight) will limit is application.

MIMO is another way to increase datarate, but more than 4x4 MIMO will be impractical, since we need set of antenna / receiver / transmitter for each stream.

 

My most honest answer to "how we can get more datarate?" is "use wire!" :-)

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