Abstract
PROBLEM TO BE SOLVED: To provide a multiplex scheme for achieving low PAPR relative to OFDM.
SOLUTION: Enhanced frequency division multiple access (EFDMA) transmits modulation symbols in the time domain. An EFDMA symbol occupies multiple subband groups that are spaced apart in a frequency band each subband group containing multiple adjacent subbands. To generate a symbol multiple modulation symbols are mapped onto a first sequence. A transform is performed on the first sequence to obtain a second sequence. The values in the second sequence corresponding to the subbands used for the symbol are retained and the remaining values are erased to obtain a third sequence. An inverse transform is performed on the third sequence to obtain a fourth sequence. A phase ramp is applied on the fourth sequence and a cyclic prefix is appended to form the symbol.
COPYRIGHT: (C)2011JPO&INPIT
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