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:
Mar. 23, 2010
Filed:
Feb. 18, 2004
Der-zheng Liu, TaiNan, TW;
Song-nien Tung, KaoHsiung, TW;
Tai-cheng Liu, KaoHsiung, TW;
Kuang-yu Yen, TaiChung, TW;
Der-Zheng Liu, TaiNan, TW;
Song-Nien Tung, KaoHsiung, TW;
Tai-Cheng Liu, KaoHsiung, TW;
Kuang-Yu Yen, TaiChung, TW;
Realtek Semiconductor Corp., Hsinchu, TW;
Abstract
The present invention provides apparatus and methods for carrier frequency offset and phase compensation, which can compensate the phase rotation of an OFDM symbol resulted from carrier frequency offset between the receiver and transmitter of an OFDM System. The apparatus and method for carrier frequency offset compensation generates an estimated carrier frequency offset according to a phase error between estimated frequency responses of two consecutive received OFDM symbols within the pilot subchannel, and calculates an accumulated phase rotation, according to the estimated carrier frequency offset, for compensating the received OFDM symbol. On the other hand, the apparatus and method for phase compensation generates an estimated residual phase error according to the pilot signal of a frequency offset-compensated OFDM symbol and the original pilot signal transmitted by the transmitter, and compensates the frequency offset-compensated OFDM symbol or a following one according to the estimated residual phase error.