Apparatus and method for reducing PAPR in OFDM communication...

Details Apparatus and method for reducing PAPR in OFDM communication... Apparatus and method for reducing PAPR in OFDM communication...

2008-03-04

2008-03-04

Kim, Kevin (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S260000

Reexamination Certificate

active

10937241

ABSTRACT:
A method for reducing a peak-to-average power ratio (PAPR) in an orthogonal frequency division multiplexing (OFDM) communication system including N carriers, among which L carriers are allocated to L reserved tones and data are carried by (N-L) remaining tones, wherein L is smaller than N, including generating an impulse signal from the L reserved tones; converting a phase of the generated impulse signal into a phase of a signal having a maximum peak value from among complex output signals obtained though inverse fast Fourier transform (IFFT) of the N carriers; scaling the generated impulse signal by the difference between the maximum peak value and a target power value; and complex-adding the scaled signal and the complex output signal after IFFT.

REFERENCES:
patent: 6147984 (2000-11-01), McCoy
patent: 6301268 (2001-10-01), Laroia et al.
patent: 6654431 (2003-11-01), Barton et al.
patent: 1 261 156 (2002-11-01), None
patent: 10-2002-0096833 (2002-12-01), None
Henkel et al., “PAR Reduction Revisited: An Extension to Tellado's Method”, 6thInternational OFDM-Workshop, 2001, pp. 31-1-31-6.
Tellado et al., “Efficient Algorithms for Reducing PAR in Multicarrier Systems”, 1998 IEEE, p. 191.
Salvekar et al., “Peak-to-Average Power Ratio Reduction for Block Transmission Systems in the Presence of Transmit Filtering”, 2001 IEEE, pp. 175-178.

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