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Which technique can be used for bandwidth reduction?

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in Digital Communications by (828k points)
Which technique can be used for bandwidth reduction?

(a) BPSK

(b) QPSK

(c) MPSK

(d) MFSK

This question was addressed to me by my college director while I was bunking the class.

I want to ask this question from Bandwidth Efficiency Plane and Bandwidth Efficient Modulation in section Modulation and Coding Trade-off of Digital Communications

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Correct option is (c) MPSK

To elaborate: Coherent M-ary PSK modulation is a well known technique for achieving bandwidth reduction.

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