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Which property of OFDMA system allows adjacent subcarriers to be used without interference?

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Which property of OFDMA system allows adjacent subcarriers to be used without interference?

(a) Orthogonality

(b) Orthodoxy

(c) Octagonality

(d) Originality

This question was addressed to me by my school principal while I was bunking the class.

I'd like to ask this question from Orthogonal Frequency Division Multiple Access (OFDMA) topic in division 4G of Wireless/Mobile

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The correct answer is (a) Orthogonality

Explanation: Orthogonality of sub-carriers simply means their correlation is zero. Orthogonality in OFDMA system allows adjacent subcarriers to be used without interference.

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