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OFDM is the digital modulation scheme that multiplexes multiple orthogonal sub-carriers that are digitally modulated. One of the schemes that improve the performance of OFDM transmission is the sub-carrier adaptive modulation scheme. In order to perform sub-carrier adaptive modulation, it is necessary to transmit the allocation information of modulation(More)
In OFDM transmission, it is possible to adoptively control transmission scheme of each sub-carrier according to the transmission channel because each sub-carrier in OFDM is orthogonally arranged in frequency domain. Although this sub-carrier independent adaptive modulation scheme is very efficient, it is necessary to transmit allocation information of(More)
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