| US 7,577,214 B2 | ||
| OFDM signal receiver and receiving method | ||
| Yoshinori Abe, Tokyo (Japan) | ||
| Assigned to Pioneer Corporation, Tokyo (Japan) | ||
| Filed on Nov. 17, 2005, as Appl. No. 11/280,335. | ||
| Claims priority of application No. 2004-334003 (JP), filed on Nov. 18, 2004. | ||
| Prior Publication US 2006/0104376 A1, May 18, 2006 | ||
| Int. Cl. H04K 1/10 (2006.01) | ||
| U.S. Cl. 375—326 [375/324; 375/344] | 6 Claims |

| 1. An OFDM signal receiver, including:
a front end section for receiving an OFDM signal including a plurality of carriers in which pilot signals, having a predetermined
complex amplitude, are superimposed, and generating a complex base area signal by performing frequency conversion processing
and sampling processing on said OFDM signal;
a symbol extraction section and FFT processing section for generating a frequency domain symbol signal from said complex base
area signal;
a receive data decoding section for demodulating said frequency domain symbol signal to generate receive data;
a frequency deviation detection section for detecting the frequency deviation of a carrier included in said OFDM signal based
on said frequency domain symbol signal; and
a conversion frequency control section for adjusting a conversion frequency in the frequency conversion processing of said
front end section based on said detected frequency deviation, wherein
said frequency deviation detection section comprises:
a symbol storage portion for locating and storing said frequency domain symbol signal in a two-dimensional data area on a
two-dimensional space corresponding to a carrier frequency and a symbol time;
a transfer characteristic calculation portion for calculating the transfer characteristic of a pilot signal included in the
symbol signal located in said two-dimensional data area;
a two-dimensional Fourier transform portion for performing two-dimensional Fourier transform on said calculated transfer characteristic
of the pilot signal and locating the data group after said transform in a two-dimensional Fourier transform data area on a
two-dimensional space corresponding to a transmission path delay time and transmission path fluctuation frequency; and
a center-of-gravity calculation portion for determining a center-of-gravity value of said data group located in said two-dimensional
Fourier transform data area and calculating the frequency deviation of said carrier based on said center-of-gravity value.
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