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In which modulation schemes, the spreading of spectrum occurs?

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In which modulation schemes, the spreading of spectrum occurs?

(a) Frequency modulation

(b) Amplitude modulation

(c) Frequency & Amplitude modulation

(d) None of the mentioned

I had been asked this question during an internship interview.

This question is from Spread Spectrum, TDMA and FDMA in section Multiplexing and Multiple Access of Digital Communications

1 Answer

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Correct choice is (a) Frequency modulation

The explanation is: In modulation schemes such as frequency modulation and pulse code modulation spreading of spectrum occurs but it cannot be considered as types of spread spectrum technique.

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