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In ____, the data signal is multiplied with a chip code data stream.

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In ____, the data signal is multiplied with a chip code data stream.

(a) Frequency Hopping Spread Spectrum (FHSS)

(b) Time Division Multiple Access (TDMA)

(c) Direct Sequence Spread Spectrum (DSSS)

(d) Frequency Division Multiple Access (FDMA)

The question was asked in an internship interview.

My doubt stems from Radio Flexibility in portion Cognitive Radio Basics of Cognitive Radio

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Correct option is (c) Direct Sequence Spread Spectrum (DSSS)

To explain I would say: The direct sequence spread spectrum is used to spread the transmitted signal over a bandwidth wider than the information bandwidth. It offers secure communication with reduce interference.

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