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Principles of Communication: Digital Communication MCQ

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Digital CommunicationHardQuestion 20307

Question

In BPSK modulation, two symbols are represented by phase shifts of 0° and 180°. The minimum bandwidth required to transmit at symbol rate f_s is:
  1. A
    f_s / 4
  2. B
    f_s / 2
  3. C
    f_s
    Correct
  4. D
    2f_s

Correct answer

f_s

Explanation

By Nyquist, the minimum (theoretical) bandwidth for a passband signal with symbol rate f_s is f_s Hz (double-sided) or f_s/2 each side around the carrier. In practice, raised-cosine filtering with roll-off factor α gives BW = f_s(1+α). BPSK at 1 Msymbols/s needs minimum 1 MHz bandwidth.

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