Multiplex communications – Communication over free space – Combining or distributing information via frequency channels
Reexamination Certificate
2006-05-10
2011-12-13
Bhattacharya, Sam (Department: 2617)
Multiplex communications
Communication over free space
Combining or distributing information via frequency channels
C370S208000
Reexamination Certificate
active
08077692
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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Khandekar Aamod
Palanki Ravi
Bhattacharya Sam
Kordich Donald C.
QUALCOMM Incorporated
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