Abstract
Enhanced frequency division multiple access (EFDMA) is a multiplexing scheme that sends modulation symbols in the time domain and achieves a lower PAPR than OFDM. An EFDMA symbol occupies multiple subband groups that are spaced apart in a frequency band with each subband group containing multiple adjacent subbands. To generate an EFDMA symbol multiple modulation symbols are mapped onto a first sequence of symbols. A transform (e.g. a DFT) is performed on the first sequence to obtain a second sequence of values. The values in the second sequence corresponding to the subbands used for the EFDMA symbol are retained and the remaining values are zeroed out to obtain a third sequence of values. An inverse transform (e.g. an IDFT) is performed on the third sequence to obtain a fourth sequence of samples. A phase ramp may be applied on the fourth sequence and a cyclic prefix is appended to form the EFDMA symbol.
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