What processing step combines multiple OFDM subcarriers into a single signal for transmission?(a) FFT(b) IFFT(c) RF combining(d) Channel mappingThis question was addressed to me by my school teacher while I was bunking the class.The origin of the question is Orthogonal Frequency Division Multiple Access (OFDMA) in division 4G of Wireless/Mobile

What processing step combines multiple OFDM subcarriers into a single

1.	What processing step combines multiple OFDM subcarriers into a single signal for transmission?(a) FFT(b) IFFT(c) RF combining(d) Channel mappingThis question was addressed to me by my school teacher while I was bunking the class.The origin of the question is Orthogonal Frequency Division Multiple Access (OFDMA) in division 4G of Wireless/Mobile
Answer» The correct option is (b) IFFT Explanation: IFFT combines multiple OFDM subcarriers into a single signal for transmission. These transforms are IMPORTANT from the OFDM perspective because they can be viewed as mapping digitally modulated input DATA (data symbols) ONTO ORTHOGONAL subcarriers.

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