Prev: C File I/O (fread) Problem
Next: RTTY (AFSK) demodulation
From: suren on 27 Feb 2010 00:23
On Feb 27, 8:57 am, Pat Z <patrick....(a)gmail.com> wrote:
> Hi, Sure,
>
> Can I ask you why atan2 would work? I thought Q^2 + I^2 will bring me
> back the incrementally added phase information. Why would tangent do?
>
> thanks
> Pat
>
> > Hi Pat,
> > you can compute phi = atan2(Q,I) and compute d(phi) (use diff(phi) in
> > matlab). This will directly give you the frequency information Then
> > you could hardslice to find if transmitted data was +/-1
>
> > Regards
> > sure

Hi,
Also forgot to add that GMSK is constant envelope signal, so I^2 + Q^2
is going to be a constant. all information is encoded in the angle,
not amplitude.

regards
suren
First  |  Prev  | 
Pages: 1 2 3
Prev: C File I/O (fread) Problem
Next: RTTY (AFSK) demodulation