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In the case of direct CDMA, interference will occur if the PN codes are

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In the case of direct CDMA, interference will occur if the PN codes are

(a) Orthogonal to each other

(b) Non orthogonal to each other

(c) Orthogonal & Non orthogonal to each other

(d) None of the mentioned

The question was asked during an online interview.

The above asked question is from Cellular Systems topic in chapter Spread Spectrum Techniques of Digital Communications

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Correct choice is (b) Non orthogonal to each other

Explanation: If the PN codes are not purely orthogonal in direct CDMA interference will occur.

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