Abstract
Improved Frequency Division Multiple Access (EFDMA) is a multiplexing scheme that transmits modulation symbols in the time domain and achieves a lower PAPR than OFDM. The EFDMA symbol occupies a plurality of subband groups spaced apart in the frequency band, each subband group comprising a plurality of contiguous subbands. To generate an EFDMA symbol, multiple modulation symbols are mapped to a first sequence of symbols. A transform (eg, 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 (eg, IDFT) is performed on the third sequence to obtain a fourth sequence of samples. A phase ramp can be applied to the fourth sequence, with a cyclic prefix added to form the EFDMA symbol.
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