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Which modulation has lower side lobe levels?

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Which modulation has lower side lobe levels?

(a) QPSK

(b) OQPSK

(c) BPSK

(d) MSK

I had been asked this question in examination.

My question is based upon Bandwidth Efficiency Plane and Bandwidth Efficient Modulation topic in portion Modulation and Coding Trade-off of Digital Communications

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Best answer
The correct option is (d) MSK

The best I can explain: MSK spectrum has wider main lobe level and lower side lobe levels than the other modulation spectrum.

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