VMSK volt: Re: go! t-com go!!

[Fuzesi Arnold]

Nna, megvan a hiszti is a cikkre...

http://www.edn.com/article/CA47238.html

Many readers simply don't accept the idea that a respected technical journal
has any business publishing a description of a technology whose foundations
they regard as erroneous at best and fraudulent at worst. In this case, they
feel so notwithstanding the headline's prominent use of the word
"allegedly," the subtitle's reference to the system proponents' vehement
denials of critics' contention that the claimed bandwidth efficiency
violates Shannon's equation, and the body copy's repeated statements that
various claims were those of the system's proponents.

The article should have done more than just express skepticism about the
proponents' claims; it should have examined those claims in the light of the
established underlying theory. Shannon's theorem, which dates back to 1948,
forms the underpinnings of information theory. If you know a channel's
bandwidth and SNR, Shannon's equation, C/B=log2(1+S/N) (where C is the
achievable channel capacity, B is the bandwidth of the channel, S is the
average signal power, and N is the average noise power), tells you the
maximum rate at which the channel can transmit data with an arbitrarily low
error rate. (Depending on the acceptable error rate, however, recovery of
data transmitted at the maximum bit rate can require an indefinite pipeline
delay for processing following the arrival of the bit stream at the
receiver.) Plugging 90 bps/Hz into the equation and solving for S/N yields
an S/N requirement of approximately 270 dB. This number is a power ratio
(not a voltage ratio). Thus, to achieve 90 bps/Hz, the signal power must
exceed the noise power by a factor of approximately 10^27.


Arnold
----- Original Message ----- 
From: "Fuzesi Arnold" <arno at externet.hu>
To: <elektro at tesla.hu>
Sent: Thursday, September 29, 2005 8:08 PM
Subject: VMSK volt: Re: go! t-com go!!


> Nna, közben megvan az eredeti forrás, az EDN magazinból.
> Kicsit elírtam a szorzót. :)
> (Monnyuk gondolkodhattam volna...1KHz-en az 5Mbit még scifinek is durva...
> :))
>
> EDN, 8/17/2000
>
> http://www.edn.com/article/CA47127.html
>
>
> Arnold
> Ui: Ez a google...beszarás. Két pillanat alatt megtaláltam az 5 éves
> cikket...
>
> ----- Original Message ----- 
> From: "Palasik Sandor" <palasik at mail.datanet.hu>
> To: <elektro at tesla.hu>
> Sent: Thursday, September 29, 2005 7:44 PM
> Subject: Re: go! t-com go!!
>
>
> > Bocs, a legújabb kacsacsőr-berakó program megtréfált. Csak az első két
sor
> > származik Arnoldtól.
> >
> > Második nekifutásra:
> >
> > > VMSK-krol anno volt egy eszmefuttatasunk jo regen itt a listan.
> > > Ezzel a modulacioval kb. 1KHz savszelessegen 5Mbit-et at lehet
> >
> > Javaslom, hogy most is nézz utána. Akkor is parasztvakítás volt,
mostanra
> > már ők is 'meghaladták' , viszont kitaláltak újabbat. Ha olyan tuti és
> > egyszerű megoldás, akkor miért nem csinál valaki végre gigabites
> drótnélküli
> > lokálhálót mondjuk a hosszúhullámú sávban.
> >
> > Érdeklődőknek:
> > http://www.vmsk.org/
> >
> > Palasik Sándor
> >
> > -----------------------------------
> >  Szponzorunk: http://tonerbolt.hu/
>
> -----------------------------------
>  Szponzorunk: http://tonerbolt.hu/