sth. about baseband and passband
12-13
We know in baseband, signal bandwidth equals (1+r)/2 times signal sampling r
ate (PAM) or equals (1+r)/2 times signal bit rate (PCM) where r is the raise
d cosine filter roll-off factor.
And according to Nyquist sampling theorem, the sampling rate is twice of hig
hest signal frequency.
So the bandwidth is (1+r) times the highest signal frequency (PAM).
Does this hold for passband?
It seems as if W=M*R_{s}=M/T_{s} for MFSK where R_{s} is the symbol rate and
T_{s} is the symbol time duration.
How about the relationship between highest frequency and bandwidth of passba
nd signaling? In another word, what's the sampling theorem of passband signa
ling?
ate (PAM) or equals (1+r)/2 times signal bit rate (PCM) where r is the raise
d cosine filter roll-off factor.
And according to Nyquist sampling theorem, the sampling rate is twice of hig
hest signal frequency.
So the bandwidth is (1+r) times the highest signal frequency (PAM).
Does this hold for passband?
It seems as if W=M*R_{s}=M/T_{s} for MFSK where R_{s} is the symbol rate and
T_{s} is the symbol time duration.
How about the relationship between highest frequency and bandwidth of passba
nd signaling? In another word, what's the sampling theorem of passband signa
ling?
Passband sampling theory:
If the bandwidth of passband signal is B, and the highest frequency is fh, t
he sampling frequency is fs=2*fh / floor(fh/B).
thanx.
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