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:
Jun. 16, 2015
Filed:
Apr. 25, 2013
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Fujitsu Semiconductor Limited, Yokohama, Kanagawa, JP;
Masataka Umeda, Yokohama, JP;
Naoto Adachi, Yokohama, JP;
FUJITSU LIMITED, Kawasaki, JP;
FUJITSU SEMICONDUCTOR LIMITED, Yokohama, JP;
Abstract
A receiving device for receiving OFDM signals in which arrangement of pilot signals changes with symbol time, includes: an inverse Fourier transform unit configured to calculate an impulse response by performing an inverse Fourier transform on pilot signals included in a received signal; a first Doppler frequency estimation unit configured to estimate a first Doppler frequency from a phase rotation amount at peak positions between impulse responses of pilot signals of different subcarriers of the impulse responses; a second Doppler frequency estimation unit configured to estimate a second Doppler frequency from a phase rotation amount between impulse responses of pilot signals of the same subcarrier of the impulse responses; and a Doppler frequency selection unit configured to select one of the first and the second Doppler frequency estimated by the first and the second Doppler frequency estimation unit so as to reduce influence of a multipath.