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If we correlate the received signal with both orthogonal function the inner product will be

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If we correlate the received signal with both orthogonal function the inner product will be

(a) In phase

(b) Quadrature

(c) In phase and quadrature

(d) Unity

The question was asked in an internship interview.

I need to ask this question from Modulation Techniques in chapter Modulation and Coding Trade-off of Digital Communications

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The correct answer is (c) In phase and quadrature

To explain: If we correlate the received signal with both the orthogonal function, the two inner products obtained will be in phase and quadrature.

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