Waveform generation for improved peak-to-average amplitude...

Details Waveform generation for improved peak-to-average amplitude... Waveform generation for improved peak-to-average amplitude...

2005-04-29

2009-12-01

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S219000, C375S267000, C375S296000, C375S303000, C370S206000, C370S210000, C455S450000, C455S464000, C455S509000

Reexamination Certificate

active

07627046

ABSTRACT:
Method and apparatus for peak-to-amplitude ratio reduction are described. A data carrying signal waveform with sub-carrier signals (S1-1through S1-M) is obtained. An initial peak reduction waveform (S2(m)) is obtained by selection of a portion of the sub-carrier signals (S1-1through S1-M) for non-data carrying. The initial peak reduction waveform (S2(m)) is refined by at least one recursive iteration which combines the initial peak reduction waveform (S2(m)) with a circularly time-shifted version thereof to obtain a resultant peak reduction waveform having a peak side lobe amplitude less than that of the initial peak reduction waveform (S2(m)).

REFERENCES:
patent: 5852630 (1998-12-01), Langberg et al.
patent: 7391815 (2008-06-01), Lakkis
patent: 2004/0218689 (2004-11-01), Akhtman
patent: 2005/0100108 (2005-05-01), Yun et al.
patent: 2005/0169398 (2005-08-01), Magee et al.
patent: 2005/0265479 (2005-12-01), Fujii et al.
patent: 2007/0201353 (2007-08-01), Wight
patent: 2007/0291860 (2007-12-01), Wang et al.

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