chap5.py

Created on March 18, 2024

568 Bytes

debit binaire:

D = 1/Tb
Tb= duree d'un bit


debit de symbole:
  
R = 1/Ts
Ts = durée d'un symbole

D=R/n
D=1/Ts/n
  ==
D=R*n
D=1/Ts*n

4ASK = 4 niveaux possbile = 2bit
       Ts=2Tb
       1/Ts=1/2Tb
       R=D/2
A pour amplitude

2FSK = f pour frequence
      2 frequences possibles
      
indice modu= (f2-f1)/R
f2-f1 = delta f
excusion = (delta f)/2

occupation spectrale:
  B=2(R+delta f)
  
representation DSP (ordonnée:
f = abscisse avec

frequence porteuse
fp-R et fp+R
et l'occupation spectrale B

I = in phase cos(wt)
Q = quadrature sin(wt)

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