[請益] sth. about baseband and passband

[supsymmetry (supsymmetry)]

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?


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