Right you are.
And it has been proven by Wifi companies like Atheros that OFDM is more robust that DSSS techniques.
It doesn't matter if you can put 1Gbps into the air channel if your packet error rate suffers so much that you have an effective rate of 10bps.
This is where 802.11a shines with its forward error schemes, interleaving, OFDM instead of DSSS Barker sequences like 802.11b.
OFDM will also allow the use of more channels so
802.11a SPEC could be updated later to more than the 48 channels for data comunication.
They could update it to have 96 true channels and make it work at ~110Mbs or higher with schemes like 256-QAM instead of 64-QAM. That would be a byte encoded symbol per channel! It would then be easy to have 144Mbs with little work on the spec!
>But his dad's a patent lawyer and wrote it up for him on a lark.
My Uncle is a DA in Washington, maybe I should get him to write me a new law or amend the constitution on a lark! Ha, Ha! Won't that be
funny? I know, he can show me how you take away rights of minority groups and put them in "special" camps. Oh man, good times.
Radio waves and computers
on
GNU Radio
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· Score: 1
Project seems neat but I wonder how you get the alliasing of computer frequencies filtered out?
Computer systems don't just generate frequencies at the main freq. That may be the fundamental freq but there will be hundreds of side bands generated in the local vicinity of you PC. Plus even if just had the fundamental freqency all other switching signals at less than the clock rate would generate a frequency and side bands themselves. It would seem like a great big noisy mess in the 5 to 30 Mhz range near your PC.
On another note it would be interesting to see if any one could build an amateur baseband system for 802.11b. That has a bandwidth that should alias down to below the 30 Mhz range with the right analog receiver. But it would not be real time as it takes ~10 Bops of computing power to decode the signal on just a PC.
(802.11a would take ~30 Bops according to the literature!)
You could have the option to start a daemon that would check this. It could look at program metadata on regular intervals or when the program starts and
warn someone every month that these programs are "expired".
That way after 6 months of running a server with no down time, the "Tron" job would email the admin a report saying that these programs in the ps list have expired security dates and need to be replaced.
Just a thought.
I seem to recall about the lawsuits that were brought against MS for a "windowing" GUI, MS argued that "Windows" word and the whole "windowing" scheme was an obvious social trend in computing and could not be trademarked, copyrighted, patented or protected. This argument seemed to help MS and they skirted the lawsuits and went about their business.... Only to later copyright, patent and trademark everything about the Windows GUI. Sort of like when Henry Ford was sued about patents on the Automobile shortly after the Model T. (Business of Armerica by John Steele Gordon) He argued that the Automobile was a "Social" device and should therefore not be applicable to a patents. Of course I am sure that he then went about patenting everything about the Model T once the patent lawsuits were over. Should Dante's Inferno be revised to include not only the Popes in hell but also businessmen who have behaved in such a double standard manner. It is not sour grapes when the dishonest win but a feeling that civilization has suffered a damage that will be harder to repair each time.
Could he survive and interactive /.?
on
To The Pain
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· Score: 1
A true test would be to give the inventor an interactive slashdotting with the thing.
One zap per web page hit should be enough.
(Huuh! Will you look at that. 3 seconds and the guy wet himself, must have been a helluva slashdotting.)
"The enemy of my enemy is my friend" I will side with whichever party will protect my freedom on a issue by issue basis. I am not a true blue this or a yellow dog that. I am an American first and party affiliation is way down on the list. Both parties have shown themselves to run counter to my beliefs at times in the past so I won't hitch my belief system to their wagon and blindly ride along. If Cops protected you or your family from an angry mob one week and shot a person out of racism next week, I wouldn't have a problem with praise of the former and condemnation of the latter action. Not "Fritz tells me I am glad you did both!" or "Fritz says to condem you for either." C'mon, I know that your morals are not by proxy!
What about both? A CDROM for the big stuff and a floppy for the config stuff. You can then flip the write protect tab when you get the setup the way you want. A password could even be set on the floppy which is encrypted with the config file to keep everyone else from looking at the config file on the disk and devising breaks. That way someone couldn't drop by to copy the disk, go home and analyze your setup and devise breaks on a private setup until it works.
Slashdot Mirror
Right you are.
And it has been proven by Wifi companies like Atheros that OFDM is more robust that DSSS techniques.
It doesn't matter if you can put 1Gbps into the air channel if your packet error rate suffers so much that you have an effective rate of 10bps.
This is where 802.11a shines with its forward error schemes, interleaving, OFDM instead of DSSS Barker sequences like 802.11b.
OFDM will also allow the use of more channels so 802.11a SPEC could be updated later to more than the 48 channels for data comunication.
They could update it to have 96 true channels and make it work at ~110Mbs or higher with schemes like 256-QAM instead of 64-QAM. That would be a byte encoded symbol per channel! It would then be easy to have 144Mbs with little work on the spec!
>But his dad's a patent lawyer and wrote it up for him on a lark. My Uncle is a DA in Washington, maybe I should get him to write me a new law or amend the constitution on a lark! Ha, Ha! Won't that be funny? I know, he can show me how you take away rights of minority groups and put them in "special" camps. Oh man, good times.
Project seems neat but I wonder how you get the alliasing of computer frequencies filtered out? Computer systems don't just generate frequencies at the main freq. That may be the fundamental freq but there will be hundreds of side bands generated in the local vicinity of you PC. Plus even if just had the fundamental freqency all other switching signals at less than the clock rate would generate a frequency and side bands themselves. It would seem like a great big noisy mess in the 5 to 30 Mhz range near your PC.
On another note it would be interesting to see if any one could build an amateur baseband system for 802.11b. That has a bandwidth that should alias down to below the 30 Mhz range with the right analog receiver. But it would not be real time as it takes ~10 Bops of computing power to decode the signal on just a PC. (802.11a would take ~30 Bops according to the literature!)
You could have the option to start a daemon that would check this. It could look at program metadata on regular intervals or when the program starts and warn someone every month that these programs are "expired". That way after 6 months of running a server with no down time, the "Tron" job would email the admin a report saying that these programs in the ps list have expired security dates and need to be replaced. Just a thought.
I seem to recall about the lawsuits that were brought against MS for a "windowing" GUI, MS argued that "Windows" word and the whole "windowing" scheme was an obvious social trend in computing and could not be trademarked, copyrighted, patented or protected. This argument seemed to help MS and they skirted the lawsuits and went about their business.... Only to later copyright, patent and trademark everything about the Windows GUI.
Sort of like when Henry Ford was sued about patents on the Automobile shortly after the Model T. (Business of Armerica by John Steele Gordon) He argued that the Automobile was a "Social" device and should therefore not be applicable to a patents. Of course I am sure that he then went about patenting everything about the Model T once the patent lawsuits were over.
Should Dante's Inferno be revised to include not only the Popes in hell but also businessmen who have behaved in such a double standard manner.
It is not sour grapes when the dishonest win but a feeling that civilization has suffered a damage that will be harder to repair each time.
A true test would be to give the inventor an interactive slashdotting with the thing. One zap per web page hit should be enough. (Huuh! Will you look at that. 3 seconds and the guy wet himself, must have been a helluva slashdotting.)
"The enemy of my enemy is my friend"
I will side with whichever party will protect
my freedom on a issue by issue basis. I am not a true blue this or a yellow dog that. I am an American first and party affiliation is way down on the list. Both parties have shown themselves to run counter to my beliefs at times in the past so I won't hitch my belief system to their wagon and blindly ride along.
If Cops protected you or your family from an angry mob one week and shot a person out of racism next week, I wouldn't have a problem with praise of the former and condemnation of the latter action. Not "Fritz tells me I am glad you did both!" or "Fritz says to condem you for either."
C'mon, I know that your morals are not by proxy!
What about both?
A CDROM for the big stuff and a floppy for the config stuff. You can then flip the write protect tab when you get the setup the way you want.
A password could even be set on the floppy which is encrypted with the config file to keep everyone else from looking at the config file on the disk and devising breaks.
That way someone couldn't drop by to copy the disk, go home and analyze your setup and devise breaks on a private setup until it works.