OFDM modulator

Details OFDM modulator OFDM modulator

2008-02-06

2010-10-05

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Transmitters

C375S296000, C375S298000, C370S210000

Reexamination Certificate

active

07809078

ABSTRACT:
An OFDM modulator having a peak factor reduction function. The OFDM modulator has a peak factor reduction unit between an IFFT unit and a guard interval insertion unit thereof. The peak factor reduction unit converts a complex signal X1outputted from the IFFT unit into a complex signal X2with a reduced peak factor based on subcarrier map information. The peak factor reduction unit generates a peak factor reduction signal by a linear combination of complex exponential functions that correspond to subcarrier frequencies to be used for wave transmission, as bases. The peak factor reduction signal is derived by repetition of, for example, a weighted least squares method or convolution processing by a fast Fourier transform.

REFERENCES:
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patent: 2004/0136314 (2004-07-01), Jung et al.
patent: 2005/0208906 (2005-09-01), Miyoshi et al.
patent: 2008/0043861 (2008-02-01), Moffatt
patent: 2009/0180574 (2009-07-01), Futagi et al.
patent: 2003-124824 (2003-04-01), None
Mobile IT Forum 4G Technical Survey Report: System Infrastructure (Ver. 1.1).

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