The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 05, 2010
Filed:
Feb. 06, 2008
Kazuyuki Hori, Tokyo, JP;
Yuji Ishida, Fujisawa, JP;
Shouhei Murakami, Yokohama, JP;
Kenji Yanagi, Yokohama, JP;
Kazuyuki Hori, Tokyo, JP;
Yuji Ishida, Fujisawa, JP;
Shouhei Murakami, Yokohama, JP;
Kenji Yanagi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
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 Xoutputted from the IFFT unit into a complex signal Xwith 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.