compare Single carrier transmission and multi carrier transmission
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The single carrier transmission means one Radio Frequency carrier is used to carry the information. Hence information in the form of bits is carried by one single RF carrier. OFDM, also known as multicarrier transmission or modulation, uses multiple carrier signals at different frequencies, sending some of the bits on each channel. This is similar to FDM(Frequency Division Multiplexing) however in the case of OFDM; all of the sub channels are dedicated to a single data source. For OFDM case IFFT is used at the transmitter to accomplish this, which does not exist in Single carrier case.
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