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. 17, 2015
Filed:
Dec. 30, 2010
Jinsoup Joung, Seongnam-si, KR;
Kyeongmin Ha, Seongnam-si, KR;
Seunghwan Ji, Seongnam-si, KR;
Yonghoon Lim, Seoul, KR;
Byungkwan Jang, Yongin-si, KR;
Jinsoup Joung, Seongnam-si, KR;
Kyeongmin Ha, Seongnam-si, KR;
Seunghwan Ji, Seongnam-si, KR;
Yonghoon Lim, Seoul, KR;
Byungkwan Jang, Yongin-si, KR;
Innowireless Co., Ltd., , KR;
Abstract
The present invention relates to an apparatus and a method for eliminating I/Q offset in a receiver of a SC-FDMA system which improves performance of the system by accurate measurement and cancellation of I/Q offset in a receiver of a SC-FDMA system operating in a 3GPP LTE uplink. An apparatus for eliminating I/Q offset in a receiver of the SC-FDMA system constituting the receiver of the SC-FDMA system includes: a linear interpolation channel estimation unit for estimating channel using demodulation reference symbol (DMRS) that is a training sequence (X) corresponding to the discrete Fourier transformed signal (Y) that has passed through frame sync acquisition, frequency compensation and cyclic prefix elimination; a signal regeneration/cancellation unit for calculating I/Q offset (D=Y−Y') by subtracting the discrete Fourier transformed signal (Y) from the ideal discrete Fourier transformed signal (Y′=H′X) generated by using channel coefficient (H′), that is an output of the linear interpolation channel estimation unit, and the DMRS that is the training sequence (X); and an I/Q offset measurement/cancellation unit for generating VQ offset-free signal (Y=Y−D′) by subtracting I/Q offset (D′) having corrected phase and power of the VQ offset (D=Y−Y′) from the discrete Fourier transformed signal (Y).