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Which is more bandwidth efficient?

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in Digital Communications by (828k points)
Which is more bandwidth efficient?

(a) Direct sequence spread spectrum

(b) Frequency hopping spread spectrum

(c) Time hopping spread spectrum

(d) None of the mentioned

The question was asked in semester exam.

My question is from Spread Spectrum and CDMA in division Multiplexing and Multiple Access of Digital Communications

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Right option is (c) Time hopping spread spectrum

For explanation: Time hopping spread spectrum is more bandwidth efficient.

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