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OFDM and OFDMA Signal in Frequency Domain
OFDM and OFDMA Signal in Frequency DomainThe sub-carriers are divided into several typesData Sub-carriers - Use QPSK, 16-QAM, 64-QAM modulation to transport data bits Pilot Sub-carriers - Data-free symbols used to maintain optimal operation of the receiver Guard Sub-carriers - Off, no power is generated at these frequencies DC Sub-carrier - Off to support direct-conversion receivers