Hi,

I have a few doubts regarding the calculation of bandwidth for various
Analog/Digital modulation, please correct me if I have gone wrong

Fm=Frequency of message signal.

deltaF=Freq.deviation

SR= Symbol Rate

AM = 2 * Fm

FM = 2 * deltaF + Fm

2FSK = 2 * deltaF + SR

4FSK = 2 * deltaF + SR

BPSK = SR

QPSK = SR

Will the Root Cosine Filter at the transmitter side will effect the bandwidth of
modulation? How? By varying the roll-factor of Root Cosine Filter,will the
bandwidth varies?

In PSK mdoulations maximum power lies in main lobe (or) main lobe and side
lobes?

We can't calculate the -3dB bandwidth for AM (because the power of side lobes
depends on the Mod.Index), can we calculate the -3dB bandwidth for FM, FSK, PSK
modulations?

How to calculate the bandWidth for AM & FM for voice signals(Variable Fm)?

Regards,

Kiran Kumar S