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What is the relation between bandwidth B of BPSK signal and the bandwidth Bm of M-ary PSK signal, for a given data rate?

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  1. Bm = MB
  2. Bm = B log2 M
  3. B = Bm log2 M
  4. B = M⋅Bm

Answer (Detailed Solution Below)

Option 3 : B = Bm log2 M
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Detailed Solution

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Concept:

M-array PSK:

For m-array PSK, minimum bandwidth to pass digitally modulated carrier is given as:

Calculation:

 -----(1)

BPSK:

For BPSK M = 2 so,

 ------(2)

From Equation 1 and 2;

B = Bm log2 M

Here, option 3 is correct.

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