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For direct sequence systems what is the minimum required processing gain?

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For direct sequence systems what is the minimum required processing gain?

(a) 3db

(b) 10db

(c) 12db

(d) 20db

This question was addressed to me in exam.

This interesting question is from Stream Encryption and Commercial Applications in chapter Spread Spectrum Techniques of Digital Communications

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The correct answer is (b) 10db

To explain I would say: For a direct sequence systems, the minimum required processing gain is 10db.

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