In_____, the high-rate ratio channels are spitted into multiple lower-rate subchannels that are then simultaneously transmitted over multiple orthogonal carrier frequencies.

In_____, the high-rate ratio channels are spitted into multiple lower-rate subchannels that are then simultaneously transmitted over multiple orthogonal carrier frequencies. 



a. FDMA
b. TDMA
c. CDMA
d. OFDM


Answer: d


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