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:
Nov. 30, 2010
Filed:
Dec. 21, 2005
Hideki Nakahara, Takatsuki, JP;
Koichiro Tanaka, Takaraduka, JP;
Naganori Shirakata, Suita, JP;
Tomohiro Kimura, Hirakata, JP;
Yasuo Harada, Kobe, JP;
Hideki Nakahara, Takatsuki, JP;
Koichiro Tanaka, Takaraduka, JP;
Naganori Shirakata, Suita, JP;
Tomohiro Kimura, Hirakata, JP;
Yasuo Harada, Kobe, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In an OFDM transmission method, in order to compensate any frequency response variation time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculator calculates a frequency response of the transmission path for a second pilot symbol. Thereafter, a compensation vector calculator calculates compensation vectors from the frequency responses of the transmission path for both the first and second pilot symbols by linear approximation. A frequency response compensator compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.