RF kerdes

[hwsw famulus]

> Ennek az USB oldala aztan a szabvanyos pc-s USB.
> Ha ezen aztan olyan adatfolyam megy at ami
> amugy eppen egy
> ethernet keret megfejelve
> a wlan kerettel is, akkor...
>
> ...mar csak azt kell kideriteni, hogy
> a valaszthato DSSS modulaciok kozul melyik
> az ami esetleg a WLAN szabvanynak is jo.
> De, nem hiszek ebben es
> a 13 MHz clock amugy se olyan hajde gyors.
>
> Szoval, azt gondolom, hogy
> a szokvany pc-s WLAN-hoz nem egyszeru vele csatlakozni.
>
> Vagy is inkabb, hogy nem megoldhato vele.
> KJ

..asszongya a WLAN, hogy

KJ

Knowing what some of the physical layer terminology means is essential to
understanding the intricacies of 802.11.


  a.. GFSK is a modulation scheme in which the data are first filtered by a
Gaussian filter in the baseband, and then modulated with a simple frequency
modulation. “2” and “4” represent the number of frequency offsets used to
represent data symbols of one and two bits, respectively.

  b.. DBPSK is phase modulation using two distinct carrier phases for data
signaling providing one bit per symbol.

  c.. DQPSK is a type of phase modulation using two pairs of distinct
carrier phases, in quadrature, to signal two bits per symbol. The
differential characteristic of the modulation schemes indicates the use of
the difference in phase from the last change or symbol to determine the
current symbol's value, rather than any absolute measurements of the phase
change.


Both the FHSS and DSSS modes are specified for operation in the 2.4 GHz
industrial, scientific and medical (ISM) band, which has sometimes been
jokingly referred to as the “interference suppression is mandatory” band
because it is heavily used by various electronic products. The third
physical layer alternative is an infrared system using near-visible light in
the 850 nm to 950 nm range as the transmission medium.



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