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What does the DC subcarrier indicate?

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in Wireless/Mobile by (138k points)
What does the DC subcarrier indicate?

(a) Identity of the cell

(b) Antenna configuration

(c) Center of OFDM channel

(d) Format of data channel

The question was posed to me in semester exam.

This interesting question is from Orthogonal Frequency Division Multiple Access (OFDMA) topic in division 4G of Wireless/Mobile

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The correct choice is (c) Center of OFDM channel

Explanation: All the subcarriers of an OFDM symbol do not carry useful data. In OFDM and OFDMA PHY layers, the DC subcarrier is the subcarrier whose frequency is equal to the RF centre frequency of the transmitting station.

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