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In PCM system, output S/N increases ________

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In PCM system, output S/N increases ________

(a) parabolically with bandwidth

(b) exponentially with bandwidth

(c) inversely with bandwidth

(d) linearly with bandwidth

This question was addressed to me during an interview.

The doubt is from Comparision of SSB Suppression Techniques in portion SSB Modulation of Analog Communications

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Correct choice is (b) exponentially with bandwidth

To explain I would say: Pulse code modulation (PCM) is a digital form of communication. Pulse Code Modulation is a technique in which the amplitude of an analogue signal is converted to a binary value represented as a series of pulses. if we calculate the ratio of signal to noise ratio for different bandwidth then we observe that it increases exponentially with it.

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