Orthogonal Frequency Division Multiplexing (OFDM) is another widely used modulation method used to achieve high data rates and spectral efficiency . It is known as a multicarrier modulation method as many carriers are used instead of just one.
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Each of the subcarriers is modulated using QAM. These modulated subcarriers can be used to support independent baseband signals but more typically they are combined to provide the maximum data throughput for one stream of data. Figure 2. An OFDM modulator sums signals of different frequencies.16 Nis 2020
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