Reducing the crest factor of a multicarrier signal

Details Reducing the crest factor of a multicarrier signal Reducing the crest factor of a multicarrier signal

2006-04-04

2006-04-04

Pascal, Robert (Department: 2817)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07023930

ABSTRACT:
A method for reducing the crest factor of a multi-carrier signal includes evaluating an inverse Fourier transform of the multi-carrier signal, thereby generating a transformed multi-carrier signal; defining a signal-to-be-corrected to be the transformed multi-carrier signal; generating a simulated output signal; estimating a signal maximum of the simulated output signal; deriving a first correction variable on the basis of the estimate; correcting the signal-to-be-corrected using at least the first correction variable, thereby generating a corrected output signal having a reduced crest factor; defining the corrected output signal to be the signal-to-be-corrected; and iteratively repeating the last five steps until the corrected output signal has a crest factor below a predetermined threshold, or a predetermined number of iterations has occurred.

REFERENCES:
patent: 6529925 (2003-03-01), Schenk
patent: 6757299 (2004-06-01), Verma
patent: 2002/0191705 (2002-12-01), Melsa et al.
patent: 19850642 (2000-05-01), None
Documents AA and AB are equivalent.
Henkel et al., “PAR reduction revisited: an extension to Tellado's method,”6thInternational OFDM-Workshop (InOWo), 2001 Hamburg, 6 pages.
Tellado et al., “Further Results on Peak-to-Average Ration Reduction,” Project T1E1.4: VDSL/ADSL, San Antonio, TX, Aug. 31, 1998, 8 pages.

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