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Which modulation scheme is preferred for direct sequence spread spectrum process?

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Which modulation scheme is preferred for direct sequence spread spectrum process?

(a) BPSK

(b) QPSK

(c) BPSK & QPSK

(d) None of the mentioned

The question was posed to me in quiz.

I want to ask this question from Direct Sequence and Frequency Hopping in chapter Spread Spectrum Techniques of Digital Communications

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Right answer is (c) BPSK & QPSK

To explain I would say: Both the modulation scheme BPSK and QPSK can be used for direct sequence spread spectrum process.

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